CVE-2023-5690
📋 TL;DR
This Cross-Site Request Forgery (CSRF) vulnerability in Modoboa email management platform allows attackers to trick authenticated users into performing unintended actions. Attackers can craft malicious web pages that, when visited by logged-in Modoboa administrators, execute unauthorized operations like creating/deleting accounts or changing configurations. All Modoboa instances prior to version 2.2.2 are affected.
💻 Affected Systems
- Modoboa
📦 What is this software?
Modoboa by Modoboa
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the email management system - attackers could create admin accounts, delete existing accounts, modify email routing rules, or exfiltrate sensitive email data.
Likely Case
Unauthorized account creation or privilege escalation allowing attackers to gain persistent access to the email system.
If Mitigated
No impact if proper CSRF protections are implemented and users don't visit malicious sites while authenticated.
🎯 Exploit Status
Exploitation requires the victim to be authenticated to Modoboa and visit a malicious webpage. The vulnerability is well-documented in the public commit and bounty reports.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.2.2
Vendor Advisory: https://github.com/modoboa/modoboa/commit/23e4c25511c66c0548da001236f47e19e3f9e4d9
Restart Required: Yes
Instructions:
1. Backup your Modoboa installation and database. 2. Update Modoboa using pip: 'pip install --upgrade modoboa==2.2.2'. 3. Run database migrations: 'python manage.py migrate'. 4. Restart your web server (Apache/Nginx) and application server (uWSGI/Gunicorn). 5. Clear browser caches for all users.
🔧 Temporary Workarounds
CSRF Token Validation
allImplement custom middleware to validate CSRF tokens on all POST requests
# Requires modifying Django settings and middleware - not a simple command
SameSite Cookie Enforcement
linuxConfigure session cookies with SameSite=Strict attribute
# In Django settings.py: SESSION_COOKIE_SAMESITE = 'Strict'
# In Nginx: add_header Set-Cookie "sessionid=...; SameSite=Strict; Secure; HttpOnly";
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to detect and block CSRF attempts
- Enforce strict browser security policies and educate users about phishing risks
🔍 How to Verify
Check if Vulnerable:
Check Modoboa version: 'pip show modoboa' or examine the web interface footer. If version is <2.2.2, you are vulnerable.Check Version:
pip show modoboa | grep VersionVerify Fix Applied:
Verify version is 2.2.2 or higher: 'pip show modoboa | grep Version'. Test form submissions to ensure CSRF tokens are required.📡 Detection & Monitoring
Log Indicators:
- Multiple failed CSRF token validations
- Unusual account creation or modification events from unexpected IPs
- POST requests missing CSRF tokens
Network Indicators:
- HTTP requests with Referer headers pointing to external domains
- Unusual patterns of form submissions
SIEM Query:
source="modoboa_logs" AND ("CSRF token missing" OR "CSRF token incorrect")