CVE-2023-34311
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Ashlar-Vellum Cobalt installations by tricking users into opening malicious CO files. Attackers can gain control of the affected system with the same privileges as the current user. All users of vulnerable Ashlar-Vellum Cobalt versions 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 machine, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Local privilege escalation leading to data exfiltration or installation of persistent malware on the affected workstation.
If Mitigated
Limited impact due to application sandboxing or restricted user privileges, potentially resulting in application crash only.
🎯 Exploit Status
Exploitation requires user interaction but is straightforward once malicious file is opened. ZDI has confirmed the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check with Ashlar-Vellum for specific patched version
Vendor Advisory: https://www.ashlar.com/security-advisories/
Restart Required: Yes
Instructions:
1. Contact Ashlar-Vellum support for security update
2. Download and install the latest patched version
3. Restart the application and system
🔧 Temporary Workarounds
Restrict CO file handling
allBlock or restrict opening of CO files from untrusted sources
Application sandboxing
allRun Cobalt with reduced privileges or in sandboxed environment
🧯 If You Can't Patch
- Implement application whitelisting to prevent unauthorized execution
- Use network segmentation to isolate affected systems
🔍 How to Verify
Check if Vulnerable:
Check Ashlar-Vellum Cobalt version against vendor's security advisoryCheck Version:
Check within Cobalt application: Help → AboutVerify Fix Applied:
Verify installation of patched version from vendor📡 Detection & Monitoring
Log Indicators:
- Unexpected application crashes
- Suspicious file opening events
- Unusual process creation from Cobalt
Network Indicators:
- Unexpected outbound connections from Cobalt process
SIEM Query:
Process creation where parent_process contains 'cobalt' AND process_name not in (expected_process_list)