CVE-2008-2019

Simple Machines Forum - CAPTCHA Bypass via Hamming Distance Analysis

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2008-2019. PoCs published by TheRook.

AI-analyzed exploit summary This repository contains a functional exploit for CVE-2008-2019, which bypasses the audio CAPTCHA system in Simple Machines Forum (SMF) by analyzing the WAV file structure and using bioinformatics techniques to decode the CAPTCHA text. The exploit includes scripts to generate and analyze WAV files to extract the CAPTCHA code.

Description

Simple Machines Forum (SMF), probably 1.1.4, relies on "randomly generated static" to hinder brute-force attacks on the WAV file (aka audio) CAPTCHA, which allows remote attackers to pass the CAPTCHA test via an automated attack that considers Hamming distances. NOTE: this issue reportedly exists because of an insufficient fix for CVE-2007-3308.

Exploits (1)

nomisec WORKING POC 2 stars
by TheRook · poc
https://github.com/TheRook/AudioCaptchaBypass-CVE-2008-2019

This repository contains a functional exploit for CVE-2008-2019, which bypasses the audio CAPTCHA system in Simple Machines Forum (SMF) by analyzing the WAV file structure and using bioinformatics techniques to decode the CAPTCHA text. The exploit includes scripts to generate and analyze WAV files to extract the CAPTCHA code.

Classification
Working Poc 90%
Attack Type
Auth Bypass
Complexity
Moderate
Reliability
Reliable
Target: Simple Machines Forum (SMF) 1.1.4 and 2.0 Beta 3
No auth needed
Prerequisites: Access to the target SMF instance · Ability to upload a WAV file
MITRE ATT&CK
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (6)

Core 6
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/42150
Third Party Advisory third-party-advisory x_refsource_sreason
http://securityreason.com/securityalert/3836
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/28866
Third Party Advisory, VDB Entry mailing-list x_refsource_bugtraq
http://www.securityfocus.com/archive/1/491128/100/0/threaded
Various Sources x_refsource_misc
http://www.rooksecurity.com/blog/?p=6

Scores

EPSS 0.0459
EPSS Percentile 89.4%

Details

CWE
CWE-264
Status published
Products (1)
simple_machines/smf 1.1.4
Published Apr 30, 2008
Tracked Since Feb 18, 2026