CVE-2020-28610
📋 TL;DR
This vulnerability in CGAL library allows remote code execution through specially crafted files that trigger out-of-bounds read and type confusion in polygon parsing functionality. Attackers can exploit this by providing malicious input to applications using CGAL's Nef polygon parsing. Systems using CGAL for computational geometry operations are affected.
💻 Affected Systems
- CGAL (Computational Geometry Algorithms Library)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full remote code execution with attacker gaining control of the affected system, potentially leading to complete system compromise, data theft, or lateral movement.
Likely Case
Application crash leading to denial of service, with potential for code execution in specific configurations where malicious files are processed.
If Mitigated
Application crash without code execution if exploit attempts are blocked or memory protections are in place.
🎯 Exploit Status
Exploitation requires crafting specific malformed polygon files. Talos Intelligence has published detailed vulnerability report TALOS-2020-1225.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: CGAL-5.1.2 and later
Vendor Advisory: https://www.cgal.org/
Restart Required: Yes
Instructions:
1. Update CGAL library to version 5.1.2 or later. 2. Recompile applications using CGAL. 3. Restart affected services. 4. For Linux distributions, use package manager: 'sudo apt update && sudo apt upgrade libcgal-dev' (Debian/Ubuntu) or 'sudo yum update cgal' (RHEL/CentOS).
🔧 Temporary Workarounds
Input Validation
allImplement strict input validation for polygon files before processing with CGAL
Disable Nef Polygon Parsing
allIf not required, disable or remove Nef polygon parsing functionality from applications
🧯 If You Can't Patch
- Implement network segmentation to isolate systems using CGAL
- Use application allowlisting to prevent execution of untrusted polygon files
🔍 How to Verify
Check if Vulnerable:
Check CGAL version: 'pkg-config --modversion cgal' or check installed package version. Versions 5.1.1 and earlier are vulnerable.Check Version:
pkg-config --modversion cgal || dpkg -l | grep libcgal || rpm -qa | grep cgalVerify Fix Applied:
Verify CGAL version is 5.1.2 or later using version check command. Test with known safe polygon files.📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing polygon files
- Memory access violation errors in application logs
- Unexpected process termination
Network Indicators:
- Unusual file uploads to applications using CGAL
- Network traffic containing malformed geometry data
SIEM Query:
source="application.logs" AND ("segmentation fault" OR "access violation" OR "out of bounds") AND process="*cgal*"🔗 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
