CVE-2025-2015
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code by tricking users into opening malicious VS files in Ashlar-Vellum Cobalt software. The type confusion flaw during file parsing enables code execution in the current process context. Users of Ashlar-Vellum Cobalt who open untrusted VS files 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 running Cobalt, potentially leading to data theft, ransomware deployment, or lateral movement.
Likely Case
Malicious code execution leading to data exfiltration, backdoor installation, or credential harvesting from the compromised system.
If Mitigated
Limited impact if user runs with minimal privileges, has application sandboxing, and follows strict file handling policies.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file). No public exploit code available as of advisory date.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched version
Vendor Advisory: https://www.zerodayinitiative.com/advisories/ZDI-25-116/
Restart Required: No
Instructions:
1. Visit Ashlar-Vellum official website
2. Download latest Cobalt update
3. Install update following vendor instructions
4. Verify installation completes successfully
🔧 Temporary Workarounds
Restrict VS file handling
allBlock or restrict opening of VS files from untrusted sources
Application sandboxing
allRun Cobalt with reduced privileges using application sandboxing or containerization
🧯 If You Can't Patch
- Implement strict file handling policies: only open VS files from trusted sources
- Use endpoint protection with file reputation checking and behavior monitoring
🔍 How to Verify
Check if Vulnerable:
Check Cobalt version against vendor advisory. If using unpatched version and processing VS files, system is vulnerable.Check Version:
Launch Cobalt and check 'About' or version information in application menuVerify Fix Applied:
Verify Cobalt version matches or exceeds patched version specified in vendor advisory.📡 Detection & Monitoring
Log Indicators:
- Unexpected Cobalt crashes
- Suspicious child processes spawned from Cobalt
- Unusual file access patterns from Cobalt process
Network Indicators:
- Unexpected outbound connections from Cobalt process
- DNS requests to suspicious domains after file opening
SIEM Query:
Process Creation where Parent Process Name contains 'Cobalt' AND (Command Line contains suspicious patterns OR Image Load contains unusual DLLs)