CVE-2023-38583
📋 TL;DR
This CVE describes a stack-based buffer overflow vulnerability in GTKWave's LXT2 file parser. Attackers can craft malicious .lxt2 files that, when opened by a victim, could lead to arbitrary code execution. Users of GTKWave who open untrusted waveform files are affected.
💻 Affected Systems
- GTKWave
📦 What is this software?
Gtkwave by Tonybybell
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining the same privileges as the user running GTKWave, potentially leading to data theft, ransomware deployment, or lateral movement.
Likely Case
Local privilege escalation or arbitrary code execution in the context of the user opening the malicious file, potentially leading to malware installation or data exfiltration.
If Mitigated
Limited impact if file opening is restricted to trusted sources, with potential application crash but no code execution.
🎯 Exploit Status
Exploitation requires user interaction to open a malicious file. Proof-of-concept details are available in the Talos Intelligence report.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor updates - Debian has patched versions available
Vendor Advisory: https://lists.debian.org/debian-lts-announce/2024/04/msg00007.html
Restart Required: No
Instructions:
1. Check for updated GTKWave package from your distribution. 2. For Debian/Ubuntu: sudo apt update && sudo apt upgrade gtkwave. 3. For other systems, download from official GTKWave repository or compile from patched source.
🔧 Temporary Workarounds
Restrict .lxt2 file handling
allConfigure system to open .lxt2 files only with trusted applications or in sandboxed environments.
Use file integrity monitoring
allMonitor for unexpected .lxt2 file creation or modification in user directories.
🧯 If You Can't Patch
- Restrict user permissions to minimize impact of potential code execution
- Implement application whitelisting to prevent unauthorized GTKWave execution
🔍 How to Verify
Check if Vulnerable:
Check GTKWave version: gtkwave --version. If version is 3.3.115 or earlier, it's likely vulnerable.Check Version:
gtkwave --versionVerify Fix Applied:
After update, verify version is newer than 3.3.115 and test opening known safe .lxt2 files.📡 Detection & Monitoring
Log Indicators:
- GTKWave crash logs with segmentation faults
- Unexpected .lxt2 file access from unusual locations
Network Indicators:
- Unusual outbound connections after GTKWave execution
SIEM Query:
process_name:"gtkwave" AND (event_type:"crash" OR file_extension:".lxt2")🔗 References
- https://lists.debian.org/debian-lts-announce/2024/04/msg00007.html
- https://talosintelligence.com/vulnerability_reports/TALOS-2023-1827
- https://lists.debian.org/debian-lts-announce/2024/04/msg00007.html
- https://talosintelligence.com/vulnerability_reports/TALOS-2023-1827
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2023-1827
