CVE-2024-33766
📋 TL;DR
CVE-2024-33766 is a floating point exception vulnerability in lunasvg v2.3.9 that can cause denial of service through application crashes. This affects applications that process SVG files using the vulnerable lunasvg library. Users and systems that parse untrusted SVG files with this library version are at risk.
💻 Affected Systems
- lunasvg
📦 What is this software?
Lunasvg by Sammycage
⚠️ Risk & Real-World Impact
Worst Case
Complete application crash leading to denial of service, potentially disrupting services that rely on SVG processing.
Likely Case
Application instability or crashes when processing specially crafted SVG files, resulting in temporary service disruption.
If Mitigated
Minimal impact if proper input validation and sandboxing are implemented around SVG processing.
🎯 Exploit Status
Proof of concept available on GitHub demonstrates triggering the FPE with crafted SVG files.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v2.3.10 or later
Vendor Advisory: https://github.com/sammycage/lunasvg/releases
Restart Required: Yes
Instructions:
1. Check current lunasvg version. 2. Update to v2.3.10 or later via package manager or manual compilation. 3. Restart affected applications using lunasvg.
🔧 Temporary Workarounds
Input validation for SVG files
allImplement strict validation and sanitization of SVG files before processing with lunasvg.
Process isolation
allRun SVG processing in isolated containers or sandboxed environments to contain crashes.
🧯 If You Can't Patch
- Implement strict file upload restrictions to block SVG files from untrusted sources
- Deploy monitoring and alerting for application crashes related to SVG processing
🔍 How to Verify
Check if Vulnerable:
Check if lunasvg version 2.3.9 is installed and being used by applications.Check Version:
lunasvg --version or check package manager (apt list lunasvg, yum list lunasvg, etc.)Verify Fix Applied:
Verify lunasvg version is 2.3.10 or later and test with known malicious SVG files.📡 Detection & Monitoring
Log Indicators:
- Application crashes with floating point exceptions
- Segmentation faults in SVG processing components
- Unexpected termination of services using lunasvg
Network Indicators:
- Unusual SVG file uploads to web applications
- Repeated requests with SVG payloads
SIEM Query:
source="application_logs" AND ("floating point exception" OR "FPE" OR "SIGFPE") AND "lunasvg"