CVE-2021-4034 PoC — polkit 缓冲区错误漏洞

Source

https://github.com/c3c/CVE-2021-4034

Associated Vulnerability

Title: polkit 缓冲区错误漏洞 (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.

Description

Pre-compiled builds for CVE-2021-4034

Readme

# CVE-2021-4034
Precompiled builds for CVE-2021-4034.

Of course you shouldn't trust precompiled builds :)

This release works slightly different: first a minimal shared object is created. This object is packaged into the main binary and dropped upon execution. Musl is used for compilation to minimize dependencies (e.g. specific libc versions maybe?)

## Acknowledgements
 * Original advisory by Qualys: https://www.qualys.com/2022/01/25/cve-2021-4034/pwnkit.txt
 * Berdav's (Davide Berardi) poc: https://github.com/berdav/CVE-2021-4034
 * Blasty's (`peter@haxx.in`) poc: https://haxx.in/files/blasty-vs-pkexec2.c

## Binaries

| Target | Link |
|--------|------|
|aarch64|[cve-2021-4034_aarch64](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_aarch64)|
|aarch64_be|[cve-2021-4034_aarch64_be](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_aarch64_be)|
|arm-eabi|[cve-2021-4034_arm-eabi](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_arm-eabi)|
|arm-eabihf|[cve-2021-4034_arm-eabihf](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_arm-eabihf)|
|armeb-eabi|[cve-2021-4034_armeb-eabi](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_armeb-eabi)|
|armeb-eabihf|[cve-2021-4034_armeb-eabihf](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_armeb-eabihf)|
|armel-eabi|[cve-2021-4034_armel-eabi](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_armel-eabi)|
|armel-eabihf|[cve-2021-4034_armel-eabihf](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_armel-eabihf)|
|armv5l-eabi|[cve-2021-4034_armv5l-eabi](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_armv5l-eabi)|
|armv5l-eabihf|[cve-2021-4034_armv5l-eabihf](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_armv5l-eabihf)|
|armv6-eabi|[cve-2021-4034_armv6-eabi](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_armv6-eabi)|
|armv6-eabihf|[cve-2021-4034_armv6-eabihf](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_armv6-eabihf)|
|armv7l-eabihf|[cve-2021-4034_armv7l-eabihf](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_armv7l-eabihf)|
|armv7m-eabi|[cve-2021-4034_armv7m-eabi](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_armv7m-eabi)|
|armv7r-eabihf|[cve-2021-4034_armv7r-eabihf](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_armv7r-eabihf)|
|i486|[cve-2021-4034_i486](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_i486)|
|i686|[cve-2021-4034_i686](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_i686)|
|m68k|[cve-2021-4034_m68k](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_m68k)|
|mips|[cve-2021-4034_mips](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_mips)|
|mips-n32sf|[cve-2021-4034_mips-n32sf](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_mips-n32sf)|
|mips-sf|[cve-2021-4034_mips-sf](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_mips-sf)|
|mips64|[cve-2021-4034_mips64](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_mips64)|
|mips64-n32|[cve-2021-4034_mips64-n32](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_mips64-n32)|
|mips64-n32sf|[cve-2021-4034_mips64-n32sf](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_mips64-n32sf)|
|mips64el|[cve-2021-4034_mips64el](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_mips64el)|
|mips64el-n32|[cve-2021-4034_mips64el-n32](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_mips64el-n32)|
|mips64el-n32sf|[cve-2021-4034_mips64el-n32sf](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_mips64el-n32sf)|
|mipsel|[cve-2021-4034_mipsel](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_mipsel)|
|mipsel-n32|[cve-2021-4034_mipsel-n32](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_mipsel-n32)|
|mipsel-n32sf|[cve-2021-4034_mipsel-n32sf](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_mipsel-n32sf)|
|mipsel-sf|[cve-2021-4034_mipsel-sf](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_mipsel-sf)|
|powerpc|[cve-2021-4034_powerpc](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_powerpc)|
|powerpc-sf|[cve-2021-4034_powerpc-sf](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_powerpc-sf)|
|powerpc64|[cve-2021-4034_powerpc64](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_powerpc64)|
|powerpc64le|[cve-2021-4034_powerpc64le](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_powerpc64le)|
|powerpcle|[cve-2021-4034_powerpcle](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_powerpcle)|
|powerpcle-sf|[cve-2021-4034_powerpcle-sf](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_powerpcle-sf)|
|riscv32|[cve-2021-4034_riscv32](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_riscv32)|
|riscv64|[cve-2021-4034_riscv64](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_riscv64)|
|s390x|[cve-2021-4034_s390x](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_s390x)|
|**x86_64**|[cve-2021-4034_x86_64](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_x86_64)|
|x86_64-x32|[cve-2021-4034_x86_64-x32](https://github.com/c3c/CVE-2021-4034/releases/download/0.2/cve-2021-4034_x86_64-x32)|

## Building

If you want to build it yourself, modify the `targets` file to include the architectures that you need. Then run `build.sh`.
You will need Docker.

File Snapshot

Remarks

1. It is advised to access via the original source first.

2. Local POC snapshots are reserved for subscribers — if the original source is unavailable, the local mirror is part of the paid plan.

View subscription plans →