CVE-2025-2018
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Ashlar-Vellum Cobalt installations by tricking users into opening malicious VS files. Attackers can gain control of the affected system through a type confusion flaw in file parsing. Users of Ashlar-Vellum Cobalt software who open untrusted VS files are at risk.
💻 Affected Systems
- Ashlar-Vellum Cobalt
📦 What is this software?
Cobalt by Ashlar
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the affected machine, potentially leading to data theft, lateral movement, or ransomware deployment.
Likely Case
Local privilege escalation leading to unauthorized access to sensitive files and system resources within the compromised user context.
If Mitigated
Limited impact with only application crash or denial of service if exploit attempts are blocked by security controls.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file). Type confusion vulnerabilities typically require precise memory manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched version
Vendor Advisory: https://www.zerodayinitiative.com/advisories/ZDI-25-118/
Restart Required: No
Instructions:
1. Check Ashlar-Vellum website for security updates
2. Download and install latest Cobalt version
3. Verify installation completes successfully
🔧 Temporary Workarounds
Restrict VS file handling
allBlock or restrict opening of VS files from untrusted sources
Application sandboxing
allRun Cobalt in restricted/sandboxed environment
🧯 If You Can't Patch
- Implement application whitelisting to block unauthorized Cobalt execution
- Deploy endpoint detection and response (EDR) to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check Cobalt version against vendor's patched version listCheck Version:
Check 'About' menu in Cobalt application or consult vendor documentationVerify Fix Applied:
Verify installed version matches or exceeds patched version from vendor advisory📡 Detection & Monitoring
Log Indicators:
- Unexpected Cobalt crashes
- VS file parsing errors
- Unusual process spawning from Cobalt
Network Indicators:
- Outbound connections from Cobalt to unknown IPs
- DNS requests for suspicious domains after file opening
SIEM Query:
Process: 'cobalt.exe' AND (EventID: 1000 OR ParentProcess contains 'explorer.exe')