CVE-2025-53505
📋 TL;DR
Group-Office versions before 6.8.119 and 25.0.20 contain a path traversal vulnerability that allows attackers to access files outside the intended directory. This affects all servers running vulnerable Group-Office installations, potentially exposing sensitive server information.
💻 Affected Systems
- Group-Office
📦 What is this software?
Group Office by Group Office
Group Office by Group Office
⚠️ Risk & Real-World Impact
Worst Case
Complete server file system disclosure including configuration files, credentials, and sensitive data, leading to full system compromise.
Likely Case
Partial file system access exposing web-accessible files, configuration details, and potentially sensitive application data.
If Mitigated
Limited exposure of non-critical files due to proper file permissions and directory restrictions.
🎯 Exploit Status
Exploitation requires understanding of path traversal techniques and knowledge of the target system's file structure.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.8.119 or 25.0.20
Vendor Advisory: https://www.group-office.com/
Restart Required: No
Instructions:
1. Backup your Group-Office installation and database. 2. Download the patched version from the official website. 3. Replace the vulnerable files with the patched version. 4. Verify the installation is working correctly.
🔧 Temporary Workarounds
Restrict file access permissions
allSet strict file permissions on sensitive directories and files to limit what can be accessed even if traversal is attempted.
chmod 750 /path/to/group-office/
chown www-data:www-data /path/to/group-office/
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block path traversal patterns
- Isolate Group-Office server from sensitive systems and implement network segmentation
🔍 How to Verify
Check if Vulnerable:
Check your Group-Office version number in the admin interface or by examining the installation files.Check Version:
Check the version.php file in the Group-Office installation directory or use the admin dashboard.Verify Fix Applied:
Confirm version is 6.8.119 or higher (for version 6.x) or 25.0.20 or higher (for version 25.x). Test file access attempts to verify they are blocked.📡 Detection & Monitoring
Log Indicators:
- Multiple failed file access attempts with '../' patterns
- Unusual file access patterns in web server logs
Network Indicators:
- HTTP requests containing '../' sequences in URLs or parameters
SIEM Query:
source="web_server_logs" AND (url="*../*" OR parameters="*../*")