CVE-2025-15069
📋 TL;DR
An improper authentication vulnerability in Gmission Web Fax allows attackers to bypass authentication mechanisms and escalate privileges. This affects Web Fax versions from 3.0 up to but not including 3.0.1. Organizations using vulnerable versions could have unauthorized access to administrative functions.
💻 Affected Systems
- Gmission Web Fax
📦 What is this software?
Web Fax by Gmission
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain full administrative control over the Web Fax system, allowing them to intercept fax communications, modify configurations, and potentially access sensitive data.
Likely Case
Unauthorized users gain elevated privileges, allowing them to access administrative functions they shouldn't have, potentially modifying system settings or accessing user data.
If Mitigated
With proper network segmentation and access controls, impact is limited to the Web Fax application itself without lateral movement to other systems.
🎯 Exploit Status
CWE-287 typically involves authentication bypass techniques that are often straightforward to exploit once discovered.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.0.1
Vendor Advisory: https://www.gmission.co.kr/fax1
Restart Required: Yes
Instructions:
1. Download Web Fax version 3.0.1 from vendor website
2. Backup current installation and configuration
3. Install the update following vendor instructions
4. Restart the Web Fax service
5. Verify authentication mechanisms are working correctly
🔧 Temporary Workarounds
Network Access Restriction
allRestrict access to Web Fax administration interface to trusted IP addresses only
Authentication Layer Enhancement
allImplement additional authentication layer (like 2FA or IP-based restrictions) for administrative functions
🧯 If You Can't Patch
- Isolate Web Fax server in a separate network segment with strict firewall rules
- Implement web application firewall (WAF) rules to detect and block authentication bypass attempts
🔍 How to Verify
Check if Vulnerable:
Check Web Fax version in administration interface or configuration files. If version is 3.0.x and less than 3.0.1, system is vulnerable.Check Version:
Check Web Fax web interface or configuration files for version informationVerify Fix Applied:
After patching, verify version shows 3.0.1 and test authentication mechanisms by attempting to access administrative functions with non-admin credentials.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by successful administrative access from same IP
- Administrative actions performed by non-admin user accounts
Network Indicators:
- Unusual authentication patterns to administrative endpoints
- Access to /admin paths from unauthorized IPs
SIEM Query:
source="web_fax_logs" AND (event_type="admin_access" AND user_role!="admin")