CVE-2020-28628
📋 TL;DR
This vulnerability in CGAL library allows remote code execution through specially crafted polygon files. Attackers can exploit out-of-bounds read and type confusion vulnerabilities to execute arbitrary code on affected systems. Any application using CGAL for polygon parsing is potentially vulnerable.
💻 Affected Systems
- CGAL (Computational Geometry Algorithms Library)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining complete control over the affected system, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Application crash leading to denial of service, with potential for limited code execution depending on application context and memory protections.
If Mitigated
Application crash without code execution if modern exploit mitigations (ASLR, DEP) are effective, though information disclosure may still occur.
🎯 Exploit Status
Exploitation requires specially crafted polygon files and knowledge of the vulnerable parsing functionality. No public exploits have been reported.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: CGAL-5.1.2 and later
Vendor Advisory: https://www.cgal.org/
Restart Required: Yes
Instructions:
1. Identify applications using CGAL library. 2. Update CGAL to version 5.1.2 or later. 3. Recompile applications with updated library. 4. Restart affected services.
🔧 Temporary Workarounds
Input validation
allImplement strict validation of polygon file inputs before processing with CGAL
Library isolation
linuxRun CGAL-dependent applications in sandboxed or containerized environments
docker run --security-opt=no-new-privileges -v /path/to/data:/data app-container
🧯 If You Can't Patch
- Implement network segmentation to isolate systems using CGAL
- Deploy application allowlisting to prevent unauthorized execution of CGAL-dependent applications
🔍 How to Verify
Check if Vulnerable:
Check CGAL version with: dpkg -l | grep libcgal (Debian/Ubuntu) or rpm -qa | grep -i cgal (RHEL/CentOS)Check Version:
cgal_create_CMakeLists --version 2>/dev/null | head -1Verify Fix Applied:
Verify CGAL version is 5.1.2 or higher using version check command📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing polygon files
- Memory access violation errors in application logs
- Unexpected process termination of CGAL-dependent applications
Network Indicators:
- Unusual network connections from CGAL-dependent applications
- Large polygon file uploads to vulnerable endpoints
SIEM Query:
source="application.logs" AND ("segmentation fault" OR "access violation" OR "CGAL") AND polygon🔗 References
- https://lists.debian.org/debian-lts-announce/2022/12/msg00011.html
- https://security.gentoo.org/glsa/202305-34
- https://talosintelligence.com/vulnerability_reports/TALOS-2020-1225
- https://lists.debian.org/debian-lts-announce/2022/12/msg00011.html
- https://security.gentoo.org/glsa/202305-34
- https://talosintelligence.com/vulnerability_reports/TALOS-2020-1225
