CVE-2023-6026
📋 TL;DR
A path traversal vulnerability in elijaa/phpmemcachedadmin version 1.3.0 allows attackers to delete arbitrary files on the server by manipulating user-supplied input. This affects any system running the vulnerable version of this PHP-based Memcached administration tool. Attackers can exploit this without authentication to delete critical system files.
💻 Affected Systems
- elijaa/phpmemcachedadmin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via deletion of critical system files (e.g., /etc/passwd, web server configuration), leading to service disruption, data loss, or privilege escalation.
Likely Case
Deletion of application files causing service disruption, data corruption in Memcached instances, or defacement of web interfaces.
If Mitigated
Limited impact with proper file permissions and input validation, potentially only affecting non-critical application files.
🎯 Exploit Status
Simple path traversal attack requiring minimal technical skill. Public details available in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.4.0 or later
Vendor Advisory: https://github.com/elijaa/phpmemcachedadmin
Restart Required: No
Instructions:
1. Backup current installation. 2. Download latest version from GitHub. 3. Replace vulnerable files with patched version. 4. Verify functionality.
🔧 Temporary Workarounds
Restrict Web Access
linuxBlock external access to phpmemcachedadmin web interface using firewall rules
iptables -A INPUT -p tcp --dport 80 -s ! TRUSTED_IP -j DROP
iptables -A INPUT -p tcp --dport 443 -s ! TRUSTED_IP -j DROP
File Permission Hardening
linuxSet restrictive permissions on sensitive directories to prevent file deletion
chmod 755 /var/www/html/phpmemcachedadmin
chown root:www-data /var/www/html/phpmemcachedadmin
🧯 If You Can't Patch
- Disable or remove phpmemcachedadmin from production systems
- Implement strict network segmentation and only allow access from trusted management networks
🔍 How to Verify
Check if Vulnerable:
Check if running version 1.3.0 by examining version.php or composer.json in installation directoryCheck Version:
grep -r "version.*1.3.0" /path/to/phpmemcachedadmin/ || cat /path/to/phpmemcachedadmin/version.phpVerify Fix Applied:
Confirm version is 1.4.0 or later and test file deletion functionality with path traversal attempts📡 Detection & Monitoring
Log Indicators:
- Unusual file deletion requests in web server logs
- Path traversal patterns (../) in URL parameters
- Failed file operations with suspicious paths
Network Indicators:
- HTTP requests with ../ sequences in parameters
- Requests to delete.php or similar endpoints with path parameters
SIEM Query:
web.url:*../* AND (web.method:DELETE OR web.status:200)