CVE-2025-2023
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code by tricking users into opening malicious LI files in Ashlar-Vellum Cobalt software. The integer overflow during file parsing enables attackers to gain control of the current process. Users of Ashlar-Vellum Cobalt who open untrusted LI files are affected.
💻 Affected Systems
- Ashlar-Vellum Cobalt
📦 What is this software?
Cobalt by Ashlar
⚠️ Risk & Real-World Impact
Worst Case
Complete 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 actor executes code with user privileges, potentially stealing sensitive files, installing malware, or using the system as a foothold for further attacks.
If Mitigated
Limited impact due to proper file validation, user awareness training, and restricted privileges, with potential for application crash but no code execution.
🎯 Exploit Status
Exploitation requires user to open malicious LI file. No authentication bypass needed but social engineering required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Ashlar-Vellum advisory for specific patched version
Vendor Advisory: https://www.ashlar.com/security-advisories/
Restart Required: No
Instructions:
1. Check Ashlar-Vellum security advisory for patch details. 2. Download latest version from official vendor site. 3. Install update following vendor instructions. 4. Verify installation completes successfully.
🔧 Temporary Workarounds
Restrict LI file handling
allBlock or restrict opening of LI files from untrusted sources
User awareness training
allTrain users to avoid opening LI files from unknown sources
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of malicious payloads
- Run Cobalt with restricted user privileges to limit impact of successful exploitation
🔍 How to Verify
Check if Vulnerable:
Check Cobalt version against vendor's patched version list. If using unpatched version and processing LI files, system is vulnerable.Check Version:
Open Cobalt → Help → About (platform dependent)Verify Fix Applied:
Verify Cobalt version matches or exceeds patched version specified in vendor advisory.📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing LI files
- Unusual process spawning from Cobalt
Network Indicators:
- Outbound connections from Cobalt to unknown IPs post-file opening
SIEM Query:
Process: 'cobalt.exe' AND (EventID: 1000 OR ParentProcess: 'cobalt.exe')