CVE-2023-37447
📋 TL;DR
CVE-2023-37447 is a memory corruption vulnerability in GTKWave's VCD file parser that allows arbitrary code execution when a user opens a malicious .vcd file. Attackers can exploit out-of-bounds read/write vulnerabilities to potentially take control of affected systems. Users of GTKWave who open untrusted VCD files are at risk.
💻 Affected Systems
- GTKWave
📦 What is this software?
Gtkwave by Tonybybell
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the victim's machine, potentially leading to data theft, ransomware deployment, or lateral movement within networks.
Likely Case
Local privilege escalation or arbitrary code execution in the context of the user running GTKWave, allowing attackers to steal sensitive data or install malware.
If Mitigated
Denial of service or application crash if memory corruption doesn't lead to successful code execution.
🎯 Exploit Status
Exploitation requires user interaction (opening a malicious file) and understanding of memory corruption techniques. No public exploits have been reported as of the advisory dates.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 3.3.115 (check for updates from official GTKWave sources)
Vendor Advisory: https://lists.debian.org/debian-lts-announce/2024/04/msg00007.html
Restart Required: No
Instructions:
1. Check current GTKWave version. 2. Visit official GTKWave website or package repository. 3. Download and install the latest version. 4. For Linux distributions, use package manager: sudo apt update && sudo apt upgrade gtkwave (or equivalent for your distribution).
🔧 Temporary Workarounds
Restrict VCD file processing
linuxPrevent GTKWave from processing untrusted VCD files by implementing file access controls
chmod 750 /usr/bin/gtkwave
chmod 750 /usr/bin/vcd2lxt
Use alternative viewers
allTemporarily use alternative VCD file viewers until GTKWave is patched
🧯 If You Can't Patch
- Implement strict file handling policies: only open VCD files from trusted sources
- Run GTKWave in sandboxed environments or virtual machines to limit potential damage
🔍 How to Verify
Check if Vulnerable:
Check GTKWave version: gtkwave --version. If version is 3.3.115 or earlier, system is vulnerable.Check Version:
gtkwave --versionVerify Fix Applied:
After updating, run gtkwave --version to confirm version is newer than 3.3.115. Test with known safe VCD files to ensure functionality.📡 Detection & Monitoring
Log Indicators:
- GTKWave crash logs
- Segmentation fault errors in system logs
- Unexpected process termination of gtkwave or vcd2lxt
Network Indicators:
- Unusual outbound connections from GTKWave process
- File downloads preceding GTKWave execution
SIEM Query:
Process:gtkwave AND (EventID:1000 OR EventID:1001) OR Process:vcd2lxt AND (EventID:1000 OR EventID:1001)🔗 References
- https://lists.debian.org/debian-lts-announce/2024/04/msg00007.html
- https://talosintelligence.com/vulnerability_reports/TALOS-2023-1805
- https://lists.debian.org/debian-lts-announce/2024/04/msg00007.html
- https://talosintelligence.com/vulnerability_reports/TALOS-2023-1805
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2023-1805
