CVE-2024-33768
📋 TL;DR
CVE-2024-33768 is a critical vulnerability in lunasvg v2.3.9 that allows attackers to trigger a segmentation violation via the composition_solid_source_over component, potentially leading to denial of service or remote code execution. This affects any application or system using the vulnerable version of the lunasvg library for SVG rendering.
💻 Affected Systems
- lunasvg
📦 What is this software?
Lunasvg by Sammycage
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Denial of service causing application crashes and service disruption.
If Mitigated
Limited impact with proper input validation and memory protection mechanisms.
🎯 Exploit Status
Proof of concept available in GitHub repository demonstrates triggering the segmentation violation.
🛠️ 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/services.
🔧 Temporary Workarounds
Input Validation
allImplement strict validation of SVG files before processing with lunasvg.
Memory Protection
linuxEnable ASLR and other memory protection mechanisms on systems using lunasvg.
sysctl -w kernel.randomize_va_space=2
🧯 If You Can't Patch
- Implement network segmentation to isolate systems using lunasvg.
- Deploy web application firewall rules to block malicious SVG file uploads.
🔍 How to Verify
Check if Vulnerable:
Check if lunasvg version 2.3.9 is installed via package manager or by checking library version.Check Version:
ldconfig -p | grep lunasvg or check package manager (apt list --installed | grep lunasvg)Verify Fix Applied:
Verify lunasvg version is 2.3.10 or later and test with known safe SVG files.📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors in application logs
- Unexpected process termination of SVG processing services
Network Indicators:
- Unusual SVG file uploads to web applications
- Multiple failed SVG processing requests
SIEM Query:
source="application.log" AND ("segmentation fault" OR "sigsegv") AND process="*lunasvg*"