CVE-2023-51931
📋 TL;DR
This vulnerability in URLite v3.1.0 allows attackers to cause denial of service (DoS) by sending specially crafted payloads to the URL parsing function. Applications using this library for URL parsing are affected, potentially causing service disruption.
💻 Affected Systems
- URLite
📦 What is this software?
Urlite by Alanclarke
⚠️ Risk & Real-World Impact
Worst Case
Complete service unavailability requiring restart of affected applications, potentially cascading to dependent services.
Likely Case
Application crashes or hangs when processing malicious URLs, requiring manual intervention to restore service.
If Mitigated
Minimal impact with proper input validation and error handling in place, though performance degradation may occur.
🎯 Exploit Status
Proof of concept available in GitHub issues. Exploitation requires sending crafted payload to URL parsing endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v3.1.1 or later
Vendor Advisory: https://github.com/alanclarke/urlite/issues/61
Restart Required: Yes
Instructions:
1. Update URLite package to v3.1.1 or later using npm update urlite. 2. Restart any applications using the library. 3. Verify the update was successful.
🔧 Temporary Workarounds
Input Validation Filter
allImplement strict input validation for URL parameters before passing to URLite parser
Rate Limiting
allImplement rate limiting on URL parsing endpoints to limit DoS impact
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) rules to block suspicious URL patterns
- Isolate URL parsing functionality in containerized or sandboxed environments
🔍 How to Verify
Check if Vulnerable:
Check package.json or node_modules for URLite version 3.1.0Check Version:
npm list urliteVerify Fix Applied:
Verify URLite version is 3.1.1 or later after update📡 Detection & Monitoring
Log Indicators:
- Application crashes or hangs when processing URLs
- High CPU/memory usage spikes during URL parsing
- Error logs containing URLite parsing failures
Network Indicators:
- Multiple requests with malformed URLs to parsing endpoints
- Unusual patterns in URL parameters
SIEM Query:
source="application.log" AND ("urlite" OR "URL parsing") AND ("crash" OR "hang" OR "high cpu")