CVE-2024-41264
📋 TL;DR
This vulnerability in Casdoor v1.636.0 allows attackers to bypass SSH host key verification, potentially enabling man-in-the-middle attacks and credential theft. Any system using the vulnerable SSH client configuration in Casdoor is affected, particularly those connecting to external SSH servers.
💻 Affected Systems
- Casdoor
📦 What is this software?
Casdoor by Casbin
⚠️ Risk & Real-World Impact
Worst Case
Attackers intercept SSH connections, steal credentials, inject malicious code, and gain unauthorized access to downstream systems.
Likely Case
Credential theft and unauthorized access to SSH servers that Casdoor connects to, potentially compromising linked systems.
If Mitigated
Limited to connection failures or warnings if proper certificate validation is enforced.
🎯 Exploit Status
Exploitation requires network access to intercept SSH connections between Casdoor and target servers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.637.0 or later
Vendor Advisory: https://github.com/casdoor/casdoor
Restart Required: Yes
Instructions:
1. Update Casdoor to v1.637.0 or later. 2. Restart the Casdoor service. 3. Verify SSH connections use proper host key verification.
🔧 Temporary Workarounds
Disable SSH client functionality
allTemporarily disable Casdoor's SSH client features if not required.
Modify Casdoor configuration to disable SSH client functionality
Implement network segmentation
allRestrict Casdoor SSH connections to trusted networks only.
Configure firewall rules to limit Casdoor SSH traffic to specific trusted hosts
🧯 If You Can't Patch
- Implement strict network controls to prevent man-in-the-middle attacks on SSH connections
- Monitor all SSH connections from Casdoor for unusual activity or interception attempts
🔍 How to Verify
Check if Vulnerable:
Check if Casdoor version is v1.636.0 or earlier and uses ssh.InsecureIgnoreHostKey() in SSH client code.Check Version:
Check Casdoor version in admin interface or via API endpoint /api/get-versionVerify Fix Applied:
Verify Casdoor version is v1.637.0 or later and SSH connections now validate host keys properly.📡 Detection & Monitoring
Log Indicators:
- Failed SSH host key verification attempts
- SSH connections to unexpected hosts
- Multiple SSH connection failures
Network Indicators:
- Unencrypted SSH traffic interception
- SSH connections to known malicious IPs
SIEM Query:
source="casdoor" AND (event="ssh_connection" OR event="ssh_error")