CVE-2025-65319
📋 TL;DR
This vulnerability in Blue Mail allows attackers to bypass Windows and third-party security protections by saving documents without Mark-of-the-Web tags. Attackers can deliver malicious files that appear safe, potentially leading to malware execution. Users of Blue Mail version 1.140.103 and below on Windows systems are affected.
💻 Affected Systems
- Blue Mail
📦 What is this software?
Bluemail by Blixhq
⚠️ Risk & Real-World Impact
Worst Case
Attackers deliver weaponized documents that bypass all file protection mechanisms, leading to full system compromise, data theft, and ransomware deployment.
Likely Case
Targeted phishing campaigns delivering malware that evades security software detection, resulting in credential theft or backdoor installation.
If Mitigated
With proper email filtering, endpoint protection, and user awareness, the risk is reduced to isolated incidents with limited impact.
🎯 Exploit Status
Exploitation requires user interaction (opening attachment); public PoC available in GitHub references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://blue.com
Restart Required: No
Instructions:
1. Check vendor advisory at http://blue.com for updates. 2. Upgrade to patched version when available. 3. Monitor for security updates.
🔧 Temporary Workarounds
Disable attachment saving
windowsPrevent Blue Mail from saving attachments to disk
Enable Windows Defender Application Control
windowsRestrict execution of untrusted files
🧯 If You Can't Patch
- Block Blue Mail executable at network perimeter
- Implement application allowlisting to prevent unauthorized execution
🔍 How to Verify
Check if Vulnerable:
Check Blue Mail version in application settings; if version is 1.140.103 or lower, system is vulnerable.Check Version:
Check application settings or About section in Blue MailVerify Fix Applied:
Verify Blue Mail version is above 1.140.103 after update; test saving attachments to confirm MOTW tags are applied.📡 Detection & Monitoring
Log Indicators:
- Unusual file saves from Blue Mail process
- Security software alerts for MOTW bypass
Network Indicators:
- Email attachments from untrusted sources
- Downloads triggered by Blue Mail
SIEM Query:
process_name:"BlueMail.exe" AND file_write_operation AND NOT file_motw_tag