关联漏洞
标题：
polkit 缓冲区错误漏洞
(CVE-2021-4034)
描述：polkit是一个在类 Unix操作系统中控制系统范围权限的组件。通过定义和审核权限规则，实现不同优先级进程间的通讯。 polkit 的 pkexec application存在缓冲区错误漏洞，攻击者可利用该漏洞通过精心设计环境变量诱导pkexec执行任意代码。成功执行攻击后，如果目标计算机上没有权限的用户拥有管理权限，攻击可能会导致本地权限升级。
描述
CVE-2021-4034
介绍
# CVE-2021-4034
## Description
A local privilege escalation vulnerability was found on polkit's pkexec utility. The pkexec application is a setuid tool designed to allow unprivileged users to run commands as privileged users according predefined policies. The current version of pkexec doesn't handle the calling parameters count correctly and ends trying to execute environment variables as commands. An attacker can leverage this by crafting environment variables in such a way it'll induce pkexec to execute arbitrary code. When successfully executed the attack can cause a local privilege escalation given unprivileged users administrative rights on the target machine.
## Usage
### Build
This creates a Pyinstaller executable using the Python source code.
*Requires Pyinstaller be installed (`pip3 install pyinstaller`)*
*May also require extra imports or dependencies when building, depending on your environment. This can easily be done by using Pyinstaller's provided `--hidden-import` option*
```bash
pyinstaller CVE-2021-4034.py --clean --onefile -n exploit
```
### Run (Binary)
```bash
./exploit
```
### Run (Source)
```bash
python3 CVE-2021-4034.py
```
文件快照
[4.0K] /data/pocs/10dc4c474385cded837e0e65780b246e7feef419
├── [1.3K] LICENSE
├── [1.1K] README.md
└── [4.0K] src
└── [3.2K] CVE-2021-4034.py
1 directory, 3 files
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