CVE-2024-36419
📋 TL;DR
SuiteCRM versions before 8.6.1 contain a Host Header Injection vulnerability in the /legacy route. This allows attackers to manipulate host headers to potentially redirect users to malicious sites or conduct phishing attacks. Organizations running vulnerable SuiteCRM instances are affected.
💻 Affected Systems
- SuiteCRM
📦 What is this software?
Suitecrm by Salesagility
⚠️ Risk & Real-World Impact
Worst Case
Attackers could redirect authenticated users to malicious websites, leading to credential theft, session hijacking, or malware installation through phishing.
Likely Case
Phishing attacks where users are redirected to fake login pages, potentially capturing credentials or sensitive information.
If Mitigated
Limited impact with proper network segmentation, web application firewalls, and user awareness training about suspicious redirects.
🎯 Exploit Status
Exploitation requires sending crafted HTTP requests with manipulated Host headers to the vulnerable /legacy endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.6.1
Vendor Advisory: https://github.com/salesagility/SuiteCRM-Core/security/advisories/GHSA-3323-hjq3-c6vc
Restart Required: No
Instructions:
1. Backup your SuiteCRM instance and database. 2. Download SuiteCRM version 8.6.1 or later from the official repository. 3. Follow the SuiteCRM upgrade documentation to apply the update. 4. Verify the /legacy route no longer accepts malicious Host headers.
🔧 Temporary Workarounds
Block /legacy Route Access
allConfigure web server (Apache/Nginx) to block or restrict access to the /legacy route.
# Apache: Add to .htaccess or virtual host config
RewriteEngine On
RewriteRule ^legacy - [F,L]
# Nginx: Add to server block
location /legacy { deny all; }
Web Application Firewall Rule
allConfigure WAF to block requests with suspicious Host headers targeting /legacy.
🧯 If You Can't Patch
- Implement strict network access controls to limit who can access the SuiteCRM instance.
- Deploy a reverse proxy or WAF to sanitize Host headers before they reach the application.
🔍 How to Verify
Check if Vulnerable:
Send an HTTP request to /legacy with a manipulated Host header (e.g., 'Host: evil.com') and check if the application processes it unsafely.Check Version:
Check the SuiteCRM version in the admin panel or via the application's version file.Verify Fix Applied:
After patching, test with the same malicious Host header; the application should reject or sanitize the input properly.📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /legacy with unusual Host header values
- Multiple redirects originating from /legacy endpoint
Network Indicators:
- Unusual outbound connections following /legacy access
- HTTP 302 redirects to external domains from /legacy
SIEM Query:
source="web_server_logs" AND uri_path="/legacy" AND (host_header CONTAINS suspicious_domain OR status_code=302)