CVE-2024-6387 PoC — Openssh: regresshion - race condition in ssh allows rce/dos

Source

Associated Vulnerability

Description

Targeting a signal handler race condition in OpenSSH's server (sshd) on glibc-based Linux systems.

Readme

# CVE-2024-6387
> a signal handler race condition in OpenSSH's server (sshd)

## Description

An exploit for CVE-2024-6387, targeting a signal handler race condition in OpenSSH's server (`sshd`) on glibc-based Linux systems. The vulnerability allows for remote code execution as root due to async-signal-unsafe functions being called in the `SIGALRM` handler.

## Installation
$ ```make all```

## Usage
$ ```./exp <ip> <port>```

## Exploit Details

### Vulnerability Summary

The exploit targets the `SIGALRM` handler race condition in OpenSSH's `sshd`:
- **Affected Versions** = [
        'SSH-2.0-OpenSSH_8.9p1 Ubuntu-3ubuntu0.10',
        'SSH-2.0-OpenSSH_9.3p1 Ubuntu-3ubuntu3.6',
        'SSH-2.0-OpenSSH_9.6p1 Ubuntu-3ubuntu13.3',
        'SSH-2.0-OpenSSH_9.3p1 Ubuntu-1ubuntu3.6',
        'SSH-2.0-OpenSSH_9.2p1 Debian-2+deb12u3',
        'SSH-2.0-OpenSSH_8.4p1 Debian-5+deb11u3'
    ]
- **Exploit**: Remote code execution as root due to the vulnerable `SIGALRM` handler calling async-signal-unsafe functions.

File Snapshot

 [4.0K]  /data/pocs/90fb776dd574db366b845841b19ba9121e5b78d9
├── [ 15K]  7etsuo-regreSSHion.c
├── [  67]  Makefile
├── [1019]  README.md
└── [ 53K]  regresshion.txt

0 directories, 4 files

Remarks