CVE-2025-32433 PoC — Erlang/OTP SSH Vulnerable to Pre-Authentication RCE

Source

https://github.com/te0rwx/CVE-2025-32433-Detection

Associated Vulnerability

Title: Erlang/OTP SSH Vulnerable to Pre-Authentication RCE (CVE-2025-32433)
Description:Erlang/OTP is a set of libraries for the Erlang programming language. Prior to versions OTP-27.3.3, OTP-26.2.5.11, and OTP-25.3.2.20, a SSH server may allow an attacker to perform unauthenticated remote code execution (RCE). By exploiting a flaw in SSH protocol message handling, a malicious actor could gain unauthorized access to affected systems and execute arbitrary commands without valid credentials. This issue is patched in versions OTP-27.3.3, OTP-26.2.5.11, and OTP-25.3.2.20. A temporary workaround involves disabling the SSH server or to prevent access via firewall rules.

Readme

# CVE-2025-32433 YARA Detection Rule

**Author:** te0rwx  
**Date:** 2025-08-27 

## Description

This YARA rule is designed to detect:

- CVE-2025-32433 Erlang SSH remote code execution exploits.
- Reverse shells (Bash, nc, Erlang `os:cmd`) including obfuscated payloads (Base64, Hex, XOR, fragmented).
- Python, Go, and Bash scanners targeting Erlang SSH.
- Stealthy execution patterns, backgrounding, and sleep-delayed commands.

The rule **minimizes false positives** by requiring multiple exploit markers or multiple scanner indicators before matching.

---

## Usage

```bash
yara -r rule-cve-2025-32433.yar /path/to/scan

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 →