CVE-2023-37420
📋 TL;DR
CVE-2023-37420 is an out-of-bounds write vulnerability in GTKWave's VCD parser that allows arbitrary code execution when processing malicious .vcd files. Users who open specially crafted .vcd files or use the vcd2lxt conversion utility are affected. This vulnerability can lead to complete system compromise.
💻 Affected Systems
- GTKWave
📦 What is this software?
Gtkwave by Tonybybell
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining complete control over the victim's system, enabling data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Local privilege escalation or arbitrary code execution in the context of the user running GTKWave, potentially leading to lateral movement within the network.
If Mitigated
Limited impact with proper application sandboxing and user privilege restrictions, potentially only affecting the GTKWave process.
🎯 Exploit Status
Exploitation requires user interaction to open malicious files. No public exploit code has been identified as of current knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 3.3.116 or later
Vendor Advisory: https://lists.debian.org/debian-lts-announce/2024/04/msg00007.html
Restart Required: No
Instructions:
1. Check current GTKWave version. 2. Update to version 3.3.116 or later using your package manager. 3. For Linux: Use apt-get update && apt-get upgrade gtkwave. 4. For Windows/macOS: Download latest version from official GTKWave website.
🔧 Temporary Workarounds
Restrict .vcd file processing
linuxPrevent GTKWave from processing untrusted .vcd files by implementing file access controls.
chmod 644 *.vcd
setfacl -m u:username:r-- *.vcd
Use alternative tools
allTemporarily use alternative VCD file viewers or converters until patching is complete.
🧯 If You Can't Patch
- Implement strict file access controls to prevent processing of untrusted .vcd files.
- Run GTKWave in a sandboxed environment with limited privileges to contain potential exploitation.
🔍 How to Verify
Check if Vulnerable:
Check if GTKWave version is 3.3.115 or earlier. On Linux: dpkg -l | grep gtkwave or gtkwave --version. On Windows: Check program properties or About dialog.Check Version:
gtkwave --version 2>/dev/null || dpkg -l | grep gtkwave || echo 'Check program properties on Windows'Verify Fix Applied:
Verify GTKWave version is 3.3.116 or later using the same version check commands.📡 Detection & Monitoring
Log Indicators:
- Unusual process crashes of GTKWave or vcd2lxt
- Suspicious file access patterns to .vcd files
- Unexpected child processes spawned from GTKWave
Network Indicators:
- Outbound connections from GTKWave process (unusual for this application)
- DNS queries to suspicious domains from GTKWave context
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-2023-1804
- https://lists.debian.org/debian-lts-announce/2024/04/msg00007.html
- https://talosintelligence.com/vulnerability_reports/TALOS-2023-1804
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2023-1804
