CVE-2025-2016
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Ashlar-Vellum Cobalt installations by tricking users into opening malicious VC6 files. Attackers can gain control of the affected system with the same privileges as the current user. All users of vulnerable Ashlar-Vellum Cobalt software are affected.
💻 Affected Systems
- Ashlar-Vellum Cobalt
📦 What is this software?
Cobalt by Ashlar
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining the same privileges as the user, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Malicious code execution leading to data exfiltration, installation of backdoors, or credential harvesting from the compromised system.
If Mitigated
Limited impact with proper application sandboxing and user privilege restrictions, potentially containing the damage to the application context.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file). The type confusion vulnerability requires specific knowledge of the file format structure.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific version
Vendor Advisory: https://www.zerodayinitiative.com/advisories/ZDI-25-117/
Restart Required: No
Instructions:
1. Visit Ashlar-Vellum support portal. 2. Download the latest security update. 3. Install the update following vendor instructions. 4. Verify installation by checking version.
🔧 Temporary Workarounds
Block VC6 file extensions
allPrevent processing of VC6 files at the system or network level
Application sandboxing
allRun Ashlar-Vellum Cobalt in restricted environments with limited permissions
🧯 If You Can't Patch
- Implement strict file type filtering to block VC6 files at email gateways and web proxies
- Educate users to never open VC6 files from untrusted sources and implement application allowlisting
🔍 How to Verify
Check if Vulnerable:
Check Ashlar-Vellum Cobalt version against vendor advisory. If processing VC6 files from untrusted sources, assume vulnerable.Check Version:
Check application 'About' menu or consult vendor documentation for version checkingVerify Fix Applied:
Verify installed version matches or exceeds the patched version specified in vendor advisory.📡 Detection & Monitoring
Log Indicators:
- Unexpected application crashes when opening VC6 files
- Suspicious child processes spawned from Ashlar-Vellum Cobalt
Network Indicators:
- Outbound connections from Ashlar-Vellum Cobalt to unknown IPs following file opening
SIEM Query:
Process creation where parent_process contains 'cobalt' AND (process contains 'cmd' OR process contains 'powershell' OR process contains 'wscript')