CVE-2024-55636
📋 TL;DR
This CVE describes a gadget chain vulnerability in Drupal Core that enables object injection when untrusted data is deserialized. While not directly exploitable on its own, it provides a vector for remote code execution if another vulnerability allows deserialization of attacker-controlled data. Affected are Drupal Core versions from 8.0.0 before 10.2.11, from 10.3.0 before 10.3.9, and from 11.0.0 before 11.0.8.
💻 Affected Systems
- Drupal Core
📦 What is this software?
Drupal by Drupal
Drupal by Drupal
Drupal by Drupal
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Privilege escalation, data manipulation, or denial of service if combined with another deserialization vulnerability.
If Mitigated
No impact if no other deserialization vulnerabilities exist and input validation is properly implemented.
🎯 Exploit Status
Exploitation requires chaining with another deserialization vulnerability; no direct exploit exists for this gadget chain alone.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 10.2.11, 10.3.9, 11.0.8
Vendor Advisory: https://www.drupal.org/sa-core-2024-006
Restart Required: No
Instructions:
1. Backup your Drupal site and database. 2. Update Drupal Core to the patched version via Composer: 'composer update drupal/core-recommended --with-dependencies'. 3. Run database updates: 'drush updatedb' or via the web interface. 4. Clear caches: 'drush cr' or via the web interface.
🔧 Temporary Workarounds
Disable PHP object deserialization
allPrevent PHP from deserializing objects in user input by modifying application logic to avoid unserialize() on untrusted data.
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all user-supplied data.
- Monitor and audit code for use of unserialize() or similar functions on untrusted input.
🔍 How to Verify
Check if Vulnerable:
Check Drupal version via admin/reports/status or 'drush status' command; if version is in affected range, site is vulnerable.Check Version:
drush status | grep 'Drupal version'Verify Fix Applied:
Confirm Drupal version is 10.2.11, 10.3.9, 11.0.8 or later via admin/reports/status or 'drush status'.📡 Detection & Monitoring
Log Indicators:
- Unusual PHP errors related to deserialization or object injection in Drupal logs.
- Unexpected process execution or file writes in system logs.
Network Indicators:
- Anomalous HTTP requests containing serialized data payloads to Drupal endpoints.
SIEM Query:
source="drupal.log" AND ("unserialize" OR "object injection" OR "PHP error")