CVE-2025-7983
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code by tricking users into opening malicious VC6 files in Ashlar-Vellum Graphite. Attackers can exploit a heap buffer overflow during file parsing to gain control of the application process. Users of Ashlar-Vellum Graphite who open untrusted VC6 files are affected.
💻 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 Graphite user, potentially leading to lateral movement, data theft, or ransomware deployment.
Likely Case
Local privilege escalation or application compromise leading to data loss, system instability, or secondary payload execution.
If Mitigated
Application crash or denial of service if exploit fails, with potential data corruption in opened files.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file). The vulnerability is heap-based which can make reliable exploitation more complex than stack-based overflows.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in available references; check vendor advisory
Vendor Advisory: https://www.zerodayinitiative.com/advisories/ZDI-25-635/
Restart Required: Yes
Instructions:
1. Check Ashlar-Vellum website for security updates
2. Download and install the latest version of Graphite
3. Restart the application and any related services
4. Verify the update was successful
🔧 Temporary Workarounds
Block VC6 file extensions
windowsPrevent opening of VC6 files via group policy or application restrictions
Use application sandboxing
allRun Graphite in a sandboxed environment to limit potential damage
🧯 If You Can't Patch
- Implement strict file type policies to block VC6 files at network perimeter and endpoints
- Use application allowlisting to restrict which users can run Graphite and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check Graphite version against vendor's patched version list. If unable to patch, test with safe proof-of-concept if available from trusted sources.Check Version:
Check 'About' menu in Graphite application or consult vendor documentation for version checkingVerify Fix Applied:
Verify Graphite version matches or exceeds patched version from vendor advisory. Test file parsing functionality with legitimate VC6 files.📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Unexpected child processes spawned from Graphite
- Unusual file access patterns for VC6 files
Network Indicators:
- Downloads of VC6 files from untrusted sources
- Outbound connections from Graphite process to unknown IPs
SIEM Query:
Process creation where parent process is graphite.exe AND (command line contains suspicious parameters OR destination IP is external)