CVE-2023-39234
📋 TL;DR
This vulnerability allows arbitrary code execution when a user opens a specially crafted .vzt file in GTKWave. Attackers can exploit out-of-bounds write vulnerabilities in the VZT file parser to execute malicious code with the privileges of the GTKWave user. Anyone using GTKWave to analyze VZT waveform files is affected.
💻 Affected Systems
- GTKWave
📦 What is this software?
Gtkwave by Tonybybell
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via arbitrary code execution with user privileges, potentially leading to lateral movement, data theft, or ransomware deployment.
Likely Case
Local privilege escalation or malware installation when users open malicious VZT files from untrusted sources.
If Mitigated
Limited impact if users only open trusted files and GTKWave runs with minimal privileges.
🎯 Exploit Status
Exploitation requires crafting a malicious .vzt file and convincing a user to open it. No public exploit code is available as of the advisory date.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Debian security updates or upstream GTKWave repository
Vendor Advisory: https://lists.debian.org/debian-lts-announce/2024/04/msg00007.html
Restart Required: No
Instructions:
1. Update GTKWave through your package manager (apt-get update && apt-get upgrade gtkwave on Debian/Ubuntu). 2. For source installations, rebuild from patched source code. 3. Verify the version is updated.
🔧 Temporary Workarounds
Restrict VZT file handling
allConfigure system to open .vzt files with alternative software or restrict GTKWave execution
Sandbox GTKWave execution
linuxRun GTKWave in a container or sandboxed environment to limit potential damage
firejail gtkwave
bwrap --dev-bind / / --ro-bind /home/user /home/user gtkwave
🧯 If You Can't Patch
- Only open VZT files from trusted sources and verify file integrity before opening
- Run GTKWave with minimal user privileges and in isolated environments
🔍 How to Verify
Check if Vulnerable:
Check GTKWave version: gtkwave --version should show 3.3.115 or earlierCheck Version:
gtkwave --versionVerify Fix Applied:
After update, verify version is newer than 3.3.115 and test opening known-safe VZT files📡 Detection & Monitoring
Log Indicators:
- GTKWave crashes with memory access violations
- Unexpected child processes spawned from GTKWave
Network Indicators:
- Unusual outbound connections from GTKWave process
SIEM Query:
Process creation where parent_process contains 'gtkwave' AND (command_line contains unusual arguments OR destination_ip is external)🔗 References
- https://lists.debian.org/debian-lts-announce/2024/04/msg00007.html
- https://talosintelligence.com/vulnerability_reports/TALOS-2023-1817
- https://lists.debian.org/debian-lts-announce/2024/04/msg00007.html
- https://talosintelligence.com/vulnerability_reports/TALOS-2023-1817
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2023-1817
