CVE-2025-11463
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Ashlar-Vellum Cobalt installations by tricking users into opening malicious XE files or visiting malicious web pages. The integer overflow during file parsing enables buffer allocation issues that can lead to remote code execution. Users of Ashlar-Vellum Cobalt software 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 full control of the affected system, data theft, and lateral movement within the network.
Likely Case
Local privilege escalation leading to data compromise and potential persistence on the affected system.
If Mitigated
Limited impact with proper application sandboxing and user privilege restrictions preventing full system compromise.
🎯 Exploit Status
Exploitation requires user interaction but has been assigned ZDI-CAN-26626 identifier
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched versions
Vendor Advisory: https://www.zerodayinitiative.com/advisories/ZDI-25-954/
Restart Required: Yes
Instructions:
1. Visit Ashlar-Vellum official website
2. Check for security updates
3. Download and install latest patch
4. Restart system and verify installation
🔧 Temporary Workarounds
Restrict XE file handling
allBlock or restrict opening of XE files from untrusted sources
Application sandboxing
allRun Cobalt in restricted/sandboxed environment
🧯 If You Can't Patch
- Implement strict file type filtering for XE files
- Use application allowlisting to restrict untrusted applications
🔍 How to Verify
Check if Vulnerable:
Check Cobalt version against vendor advisory; test with known safe XE file parsingCheck Version:
Check application 'About' menu or vendor documentationVerify Fix Applied:
Verify installed version matches patched version from vendor advisory📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes
- Memory allocation errors
- Suspicious file parsing activities
Network Indicators:
- Downloads of XE files from untrusted sources
- Unusual outbound connections after file opening
SIEM Query:
Process creation events from cobalt.exe with suspicious parent processes or command line arguments