CVE-2021-4034 PoC — polkit 缓冲区错误漏洞

Source

https://github.com/CYB3RK1D/CVE-2021-4034-POC

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

pwnkit

Readme

### CREDITS
 VULNERABILITY AUTHOR: https://blog.qualys.com/vulnerabilities-threat-research/2022/01/25/pwnkit-local-privilege-escalation-vulnerability-discovered-in-polkits-pkexec-cve-2021-4034
 
 # Reference 
 https://github.com/arthepsy/CVE-2021-4034/blob/main/cve-2021-4034-poc.c
 
 https://linux.die.net/man/1/pkexec
 
 
 man_page/pkexec:
 
  
       Note that pkexec does no validation of the ARGUMENTS passed to PROGRAM.
       In the normal case (where administrator authentication is required
       every time pkexec is used), this is not a problem since if the user is
       an administrator he might as well just run pkexec bash to get root.

       However, if an action is used for which the user can retain
       authorization (or if the user is implicitly authorized), such as with
       pk-example-frobnicate above, this could be a security hole. Therefore,
       as a rule of thumb, programs for which the default required
       authorization is changed, should never implicitly trust user input
       (e.g. like any other well-written suid program).      
  
 by the author David Zeuthen <davidz@redhat.com>
  written in may 2009.
 # GCONV resources
 https://www.gnu.org/software/libc/manual/html_node/glibc-iconv-Implementation.html#:~:text=for%20all%20conversions.-,gconv,use%20of%20the%20conversion%20functions.
 https://hugeh0ge.github.io/2019/11/04/Getting-Arbitrary-Code-Execution-from-fopen-s-2nd-Argument/
 
 

# PwnFunction
  
  EXPLANATION VIDEO: https://youtu.be/eTcVLqKpZJc
 

# TO DO
   Port the exploit to rust
   
   need to write an explanation for exploit

File Snapshot


 [4.0K]  /data/pocs/ce94d59d5e456dffc87a5dc895eafe3c67c023c8
├── [1.2K]  pkexec_exploit.c
├── [  53]  pkexec_exploit.rs
└── [1.6K]  README.md

0 directories, 3 files

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