CVE-2023-1886
📋 TL;DR
This CVE describes an authentication bypass vulnerability in phpMyFAQ where attackers can replay captured authentication data to gain unauthorized access. It affects all users running phpMyFAQ versions prior to 3.1.12. The vulnerability allows attackers to impersonate legitimate users without knowing their credentials.
💻 Affected Systems
- phpMyFAQ
📦 What is this software?
Phpmyfaq by Phpmyfaq
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain administrative access to the FAQ system, allowing them to modify content, access sensitive user data, or use the system as a foothold for further attacks.
Likely Case
Unauthorized users gain access to protected areas of the FAQ system, potentially viewing or modifying restricted content.
If Mitigated
With proper network segmentation and monitoring, impact is limited to the FAQ system itself with no lateral movement.
🎯 Exploit Status
Exploitation requires capturing authentication traffic, which can be done via man-in-the-middle attacks or network sniffing.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.1.12
Vendor Advisory: https://github.com/thorsten/phpmyfaq/commit/27eaaae16850694634ac52416a0bd38b35d7330a
Restart Required: No
Instructions:
1. Backup your current installation. 2. Download phpMyFAQ 3.1.12 or later from the official repository. 3. Replace all files with the new version. 4. Verify the installation works correctly.
🔧 Temporary Workarounds
Enable HTTPS enforcement
allForce all traffic to use HTTPS to prevent capture of authentication data in transit
# Configure web server to redirect HTTP to HTTPS
# Set HSTS headers
Network segmentation
allIsolate phpMyFAQ server from untrusted networks
# Configure firewall rules to restrict access
# Use VLAN segmentation
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the phpMyFAQ server
- Enable detailed logging and monitoring for authentication attempts and replay attacks
🔍 How to Verify
Check if Vulnerable:
Check phpMyFAQ version in admin panel or by examining the source code version constantCheck Version:
Check the PMF_VERSION constant in inc/Configuration.php or view the admin dashboardVerify Fix Applied:
Verify version is 3.1.12 or later and check that the commit 27eaaae16850694634ac52416a0bd38b35d7330a is present📡 Detection & Monitoring
Log Indicators:
- Multiple authentication attempts from same IP with identical timing patterns
- Successful logins from unusual locations or IPs
Network Indicators:
- Repeated identical authentication packets
- HTTP traffic containing authentication data without encryption
SIEM Query:
source="phpmyfaq.log" AND (event="login" OR event="authentication") | stats count by src_ip, user | where count > threshold