CVE-2019-19826
📋 TL;DR
This vulnerability in the Drupal Views Dynamic Fields module allows attackers to perform PHP object injection through insecure unserialize calls. This can lead to arbitrary file deletion and potentially remote code execution. All Drupal sites using the vulnerable module versions are affected.
💻 Affected Systems
- Drupal Views Dynamic Fields module
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, and persistent backdoor installation.
Likely Case
File deletion causing service disruption and potential data loss, with possible code execution if attackers can chain exploits.
If Mitigated
Limited impact if proper input validation and file permissions are in place, but still significant risk.
🎯 Exploit Status
Exploitation is straightforward once the vulnerability is understood, with public proof-of-concept available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.x-1.0-alpha5
Vendor Advisory: https://www.drupal.org/project/views_dynamic_fields/issues/3056600
Restart Required: No
Instructions:
1. Update the Views Dynamic Fields module to version 7.x-1.0-alpha5 or later. 2. Clear Drupal caches. 3. Verify the update was successful.
🔧 Temporary Workarounds
Disable vulnerable module
linuxTemporarily disable the Views Dynamic Fields module until patching is possible
drush pm-disable views_dynamic_fields
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all user inputs
- Apply web application firewall rules to block serialized object injection attempts
🔍 How to Verify
Check if Vulnerable:
Check if the Views Dynamic Fields module is installed and its version is 7.x-1.0-alpha4 or earlierCheck Version:
drush pmi views_dynamic_fields | grep VersionVerify Fix Applied:
Verify module version is 7.x-1.0-alpha5 or later and test for unserialize vulnerabilities📡 Detection & Monitoring
Log Indicators:
- Unusual unserialize operations
- Archive_Tar object creation attempts
- Unexpected file deletion events
Network Indicators:
- HTTP requests containing serialized PHP objects
- Patterns matching object injection payloads
SIEM Query:
search 'unserialize' OR 'Archive_Tar' OR 'field_names' in web server logs