CVE-2022-30287
📋 TL;DR
CVE-2022-30287 is a reflection injection vulnerability in Horde Groupware Webmail Edition that allows attackers to instantiate driver classes and achieve arbitrary PHP object deserialization. This can lead to remote code execution on affected systems. Organizations running Horde Webmail Edition versions up to 5.2.22 are vulnerable.
💻 Affected Systems
- Horde Groupware Webmail Edition
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data exfiltration, and lateral movement within the network.
Likely Case
Remote code execution allowing attackers to execute arbitrary commands, access email data, and potentially pivot to other systems.
If Mitigated
Limited impact with proper network segmentation, web application firewalls, and minimal privileges.
🎯 Exploit Status
Exploitation is well-documented and relatively straightforward for attackers with PHP knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.2.23 and later
Vendor Advisory: https://www.horde.org/apps/webmail
Restart Required: No
Instructions:
1. Backup your Horde installation and configuration. 2. Download Horde Webmail Edition 5.2.23 or later from the official website. 3. Replace the affected files with the patched version. 4. Verify the installation works correctly.
🔧 Temporary Workarounds
Web Application Firewall Rules
allImplement WAF rules to block suspicious PHP object serialization patterns and reflection injection attempts.
Disable Unused Features
allDisable or restrict access to vulnerable components if not required for business operations.
🧯 If You Can't Patch
- Isolate the Horde server in a DMZ with strict inbound/outbound firewall rules
- Implement network segmentation to limit lateral movement if compromised
🔍 How to Verify
Check if Vulnerable:
Check the Horde version in the web interface or by examining the installation files. Versions 5.2.22 and earlier are vulnerable.Check Version:
Check the horde/version.php file or the web interface admin panelVerify Fix Applied:
Verify the version has been updated to 5.2.23 or later and test that the webmail functionality works normally.📡 Detection & Monitoring
Log Indicators:
- Unusual PHP error logs related to unserialize() or reflection
- Suspicious POST requests to Horde endpoints
- Unexpected process execution from web server user
Network Indicators:
- Unusual outbound connections from the webmail server
- Traffic patterns indicating data exfiltration
SIEM Query:
source="horde_logs" AND ("unserialize" OR "ReflectionClass" OR "driver")🔗 References
- https://blog.sonarsource.com/horde-webmail-rce-via-email/
- https://lists.debian.org/debian-lts-announce/2022/08/msg00022.html
- https://www.horde.org/apps/webmail
- https://blog.sonarsource.com/horde-webmail-rce-via-email/
- https://lists.debian.org/debian-lts-announce/2022/08/msg00022.html
- https://lists.debian.org/debian-lts-announce/2024/10/msg00014.html
- https://www.horde.org/apps/webmail
