CVE-2018-3783
📋 TL;DR
CVE-2018-3783 is a critical privilege escalation vulnerability in flintcms that allows attackers to perform blind MongoDB injection during password reset operations. This enables complete account takeover of any user account. All flintcms installations running version 1.1.9 or earlier are affected.
💻 Affected Systems
- flintcms
📦 What is this software?
Flintcms by Flintcms
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of all user accounts, including administrative accounts, leading to full system takeover, data theft, and potential lateral movement to other systems.
Likely Case
Attackers reset passwords for high-value accounts (admins, executives) to gain administrative access, modify content, steal sensitive data, and maintain persistent access.
If Mitigated
With proper network segmentation and monitoring, impact is limited to the flintcms instance itself, though user data would still be compromised.
🎯 Exploit Status
Exploitation requires no authentication and can be performed via HTTP requests to the password reset endpoint. Detailed exploit code is publicly available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.2.0
Vendor Advisory: https://github.com/flintcms/flintcms/security/advisories/GHSA-xxxx-xxxx-xxxx
Restart Required: Yes
Instructions:
1. Backup your flintcms installation and database. 2. Update flintcms to version 1.2.0 or later using npm: 'npm update flintcms'. 3. Restart the flintcms service. 4. Verify the update was successful.
🔧 Temporary Workarounds
Disable Password Reset
allTemporarily disable the password reset functionality until patching can be completed.
Modify flintcms configuration to remove or disable the password reset route
WAF Rule Implementation
allImplement web application firewall rules to block MongoDB injection patterns in password reset requests.
Add WAF rule to block requests containing MongoDB operators ($ne, $gt, $regex, etc.) in password reset parameters
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the flintcms instance from other critical systems
- Enable detailed logging and monitoring of all password reset attempts and implement alerting for suspicious patterns
🔍 How to Verify
Check if Vulnerable:
Check the flintcms package version in package.json or via npm list flintcms. If version is 1.1.9 or earlier, the system is vulnerable.Check Version:
npm list flintcms | grep flintcmsVerify Fix Applied:
After updating, verify the version is 1.2.0 or later using 'npm list flintcms'. Test password reset functionality to ensure it works without allowing injection.📡 Detection & Monitoring
Log Indicators:
- Unusual password reset requests, especially with MongoDB operators in parameters
- Multiple failed login attempts followed by successful password resets from same IP
- Password reset requests for multiple accounts from single source
Network Indicators:
- HTTP POST requests to /password/reset containing MongoDB query operators
- Unusual traffic patterns to password reset endpoints
SIEM Query:
source="flintcms" AND (url_path="/password/reset" AND (request_body CONTAINS "$ne" OR request_body CONTAINS "$gt" OR request_body CONTAINS "$regex"))