CVE-2024-13296
📋 TL;DR
This vulnerability in Drupal Mailjet module allows attackers to inject malicious objects through deserialization of untrusted data, potentially leading to remote code execution. It affects all Drupal sites using Mailjet module versions before 4.0.1. Attackers could compromise the Drupal installation and potentially the underlying server.
💻 Affected Systems
- Drupal Mailjet module
📦 What is this software?
Mailjet by Mailjet
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, and lateral movement within the network.
Likely Case
Arbitrary code execution within Drupal context, allowing website defacement, data manipulation, and installation of backdoors.
If Mitigated
Limited impact if proper input validation and output encoding are implemented elsewhere in the application stack.
🎯 Exploit Status
Deserialization vulnerabilities typically require crafting specific payloads but are often weaponized quickly once details are public.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.0.1
Vendor Advisory: https://www.drupal.org/sa-contrib-2024-062
Restart Required: No
Instructions:
1. Update Mailjet module to version 4.0.1 via Drupal's update manager or Composer. 2. Clear Drupal caches. 3. Verify module functionality post-update.
🔧 Temporary Workarounds
Disable Mailjet module
allTemporarily disable the vulnerable Mailjet module until patching is possible
drush pm-disable mailjet
Restrict access to vulnerable endpoints
allUse web application firewall or Drupal access controls to block requests to Mailjet-related endpoints
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all user inputs
- Deploy web application firewall with deserialization attack detection rules
🔍 How to Verify
Check if Vulnerable:
Check Mailjet module version in Drupal admin at /admin/modules or via 'drush pm-list | grep mailjet'Check Version:
drush pm-list --fields=name,version --format=json | grep -A1 mailjetVerify Fix Applied:
Confirm Mailjet module version is 4.0.1 or higher and test Mailjet functionality📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to Mailjet endpoints
- PHP errors related to unserialize() or object injection
- Unexpected process execution from web user context
Network Indicators:
- HTTP requests with serialized data payloads to Mailjet endpoints
- Outbound connections from web server to unexpected destinations
SIEM Query:
web_access_logs | where url contains 'mailjet' and (request_body contains 'O:' or request_body contains 'C:')