CVE-2025-7979
📋 TL;DR
A stack-based buffer overflow vulnerability in Ashlar-Vellum Graphite's VC6 file parser allows remote attackers to execute arbitrary code when users open malicious files. This affects installations of Ashlar-Vellum Graphite software. Attackers can achieve remote code execution in the context of the current process.
💻 Affected Systems
- Ashlar-Vellum Graphite
📦 What is this software?
Graphite by Ashlar
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining the same privileges as the user running Graphite, potentially leading to data theft, ransomware deployment, or lateral movement.
Likely Case
Attacker executes malicious code on the victim's machine, potentially installing malware, stealing sensitive data, or using the system as a foothold for further attacks.
If Mitigated
Limited impact with proper controls like application sandboxing, privilege separation, and network segmentation preventing lateral movement.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file). ZDI-CAN-25463 identifier suggests detailed technical analysis exists.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.zerodayinitiative.com/advisories/ZDI-25-633/
Restart Required: No
Instructions:
1. Monitor Ashlar-Vellum website for security updates. 2. Apply vendor patch when available. 3. Restart application after patching.
🔧 Temporary Workarounds
Block VC6 file extensions
allPrevent processing of VC6 files at email gateways or network perimeters
User awareness training
allTrain users not to open VC6 files from untrusted sources
🧯 If You Can't Patch
- Implement application sandboxing/containerization to limit impact
- Use endpoint detection and response (EDR) to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check if Ashlar-Vellum Graphite is installed and processes VC6 filesCheck Version:
Check application 'About' menu or vendor documentationVerify Fix Applied:
Verify patch installation and test with safe VC6 files📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing VC6 files
- Unusual process creation from Graphite
Network Indicators:
- Downloads of VC6 files from untrusted sources
SIEM Query:
Process:Graphite AND (FileExtension:vc6 OR CrashDetected)