CVE-2024-41657
📋 TL;DR
A logic vulnerability in Casdoor's CORS filter allows any website to make cross-domain requests to Casdoor as the logged-in user. This occurs because the Origin header validation only checks for a prefix, enabling attackers to create malicious subdomains that pass authentication. All Casdoor users running affected versions are vulnerable to session hijacking and unauthorized actions.
💻 Affected Systems
- Casdoor
📦 What is this software?
Casdoor by Casbin
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers can perform any action as authenticated users, including account takeover, data exfiltration, privilege escalation, and configuration changes to the IAM/SSO platform.
Likely Case
Session hijacking leading to unauthorized access to user accounts and sensitive data managed through Casdoor.
If Mitigated
Limited impact if proper network segmentation, WAF rules, and monitoring are in place to detect anomalous cross-origin requests.
🎯 Exploit Status
Exploitation requires user interaction (visiting malicious site) but the technical barrier is low. GitHub Security Lab has published detailed advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.578.0 or later
Vendor Advisory: https://github.com/casdoor/casdoor/security/advisories
Restart Required: Yes
Instructions:
1. Update Casdoor to version 1.578.0 or later. 2. Restart the Casdoor service. 3. Verify the fix by checking the CORS filter implementation.
🔧 Temporary Workarounds
Disable CORS or restrict origins
allTemporarily disable CORS or configure strict origin validation in Casdoor configuration
Edit casdoor configuration to set cors_allow_origins to specific trusted domains only
Implement reverse proxy with CORS validation
linuxPlace a reverse proxy (nginx, Apache) in front of Casdoor with proper CORS validation
Configure nginx with: add_header 'Access-Control-Allow-Origin' 'trusted-domain.com';
add_header 'Access-Control-Allow-Credentials' 'true';
🧯 If You Can't Patch
- Implement strict network segmentation to limit Casdoor access to trusted networks only
- Deploy WAF with rules to detect and block suspicious Origin headers and cross-origin requests
🔍 How to Verify
Check if Vulnerable:
Check if Casdoor version is 1.577.0 or earlier. Review CORS configuration and test with crafted Origin headers containing valid subdomain prefixes.Check Version:
Check Casdoor web interface admin panel or run: ./casdoor --versionVerify Fix Applied:
Verify Casdoor version is 1.578.0 or later. Test that requests with malicious Origin headers (like localhost.example.com) are properly rejected.📡 Detection & Monitoring
Log Indicators:
- Unusual Origin headers in access logs
- Cross-origin requests from unexpected domains
- Failed authentication attempts with crafted Origin headers
Network Indicators:
- HTTP requests with Origin headers containing subdomains of legitimate domains
- Cross-origin requests with credentials from unexpected sources
SIEM Query:
source="casdoor" AND (Origin="*" OR Origin CONTAINS ".example.com" OR Origin MATCHES "^[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$")