CVE-2023-51889
📋 TL;DR
A stack overflow vulnerability in Mathtex v1.05 and earlier allows remote attackers to execute arbitrary code by sending a specially crafted string in the application URL. This affects all systems running vulnerable versions of Mathtex, particularly those exposed to untrusted user input.
💻 Affected Systems
- Mathtex
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with full system compromise, allowing attackers to install malware, steal data, or pivot to other systems.
Likely Case
Remote code execution leading to system compromise, data theft, or service disruption.
If Mitigated
Denial of service or application crash if exploit attempts are blocked.
🎯 Exploit Status
The vulnerability is in a publicly documented function and exploitation details are available in the referenced blog posts.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Check for updated versions from the Mathtex project. 2. If no patch is available, implement workarounds. 3. Consider replacing Mathtex with alternative software if security is critical.
🔧 Temporary Workarounds
Input Validation Filter
allImplement strict input validation to reject malformed URLs before they reach the validate() function.
# Implement in application code: validate input length and characters before processing
Web Application Firewall Rules
allConfigure WAF to block requests with suspicious URL patterns targeting the validate function.
# WAF specific configuration - block requests with excessive URL parameters or special characters
🧯 If You Can't Patch
- Isolate Mathtex instances in network segments with strict access controls
- Implement rate limiting and monitoring for exploit attempts
🔍 How to Verify
Check if Vulnerable:
Check Mathtex version; if version is 1.05 or earlier, the system is vulnerable.Check Version:
Check Mathtex documentation or configuration files for version informationVerify Fix Applied:
Verify that input validation has been implemented or that Mathtex has been updated to a version after 1.05.📡 Detection & Monitoring
Log Indicators:
- Unusual URL patterns with long strings or special characters
- Application crashes or abnormal termination of Mathtex processes
Network Indicators:
- HTTP requests with unusually long URL parameters targeting Mathtex endpoints
- Multiple rapid requests to the validate function
SIEM Query:
source="web_logs" AND (url="*validate*" AND (url_length>1000 OR url_contains_special_chars))