Baron Samedit PoC

Description

This is a Proof-of-Concept (PoC) exploit for the Baron Samedit vulnerability (CVE-2021-3156) tested on Ubuntu 20.04 with sudo version 1.8.31 and glibc version 2.31. The exploit leverages a heap-based buffer overflow in sudo's handling of command-line arguments when using sudoedit to achieve privilege escalation.

Exploit Components

• exploit.asm: A handcrafted assembly exploit that constructs the argument and environment buffers to trigger the vulnerability.
• shellcode.c: A minimal shared object payload that executes /bin/sh with elevated privileges.
• Makefile: Automates the build process for both the shellcode and exploit binary.

Build Instructions

To compile the exploit:

make

Exploit Execution

1. Run the exploit binary:

   ./exploit

2. If successful, this will invoke the vulnerable sudoedit with a corrupted environment, leading to privilege escalation.

Prerequisites

• Ensure that sudo version 1.8.31 is installed and unpatched.
• Ubuntu 20.04 with glibc 2.31.
• Proper permissions to execute the exploit.

Cleanup

To remove generated files:

make clean

Disclaimer

This PoC is for educational and research purposes only. Unauthorized use on systems without explicit permission is illegal and unethical, I will not be held accountable for your actions. Thank you.