CVE-2023-6361
📋 TL;DR
This CVE describes a buffer overflow vulnerability in Winhex that allows attackers to execute arbitrary code by providing a specially crafted long filename argument. The vulnerability affects Winhex versions 16.1 SR-1 and 20.4, potentially compromising systems where this software is installed.
💻 Affected Systems
- Winhex
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with remote code execution, leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Local privilege escalation or arbitrary code execution in the context of the Winhex user, potentially leading to lateral movement within the network.
If Mitigated
Limited impact if Winhex runs with minimal privileges and proper application whitelisting is enforced.
🎯 Exploit Status
Exploitation requires user interaction or automated processing of malicious filenames. SEH overwrite technique is well-documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 20.4
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-winhex
Restart Required: No
Instructions:
1. Download latest Winhex version from official website. 2. Uninstall current version. 3. Install updated version. 4. Verify version is greater than 20.4.
🔧 Temporary Workarounds
Restrict Winhex Usage
windowsLimit Winhex execution to trusted users and contexts only
Application Control
windowsImplement application whitelisting to prevent unauthorized Winhex execution
🧯 If You Can't Patch
- Run Winhex with minimal user privileges (not as administrator)
- Monitor for unusual Winhex process activity or unexpected filename arguments
🔍 How to Verify
Check if Vulnerable:
Check Winhex version via Help > About menu. If version is 16.1 SR-1 or 20.4, system is vulnerable.Check Version:
wmic product where name="Winhex" get versionVerify Fix Applied:
Verify Winhex version is greater than 20.4 in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Unusual Winhex process execution patterns
- Long filename arguments in command line logs
Network Indicators:
- Unusual outbound connections from Winhex process
SIEM Query:
Process Name="winhex.exe" AND CommandLine Contains "*" (looking for unusually long arguments)