CVE-2021-3825
📋 TL;DR
CVE-2021-3825 is a critical configuration exposure vulnerability in LiderAhenk's Lider module that allows attackers to retrieve LDAP credentials via an unsecured API. This affects all LiderAhenk deployments running Lider module version 2.1.15 and below. Attackers can obtain valid LDAP credentials, potentially compromising the entire directory service infrastructure.
💻 Affected Systems
- LiderAhenk Lider module
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full domain compromise via LDAP credential theft leading to lateral movement, privilege escalation, and complete system takeover across all managed Pardus clients.
Likely Case
LDAP credential exposure enabling unauthorized access to directory services, user account compromise, and potential data exfiltration.
If Mitigated
Limited impact if API access is restricted through network segmentation and proper authentication controls.
🎯 Exploit Status
Exploitation requires only HTTP access to the vulnerable API endpoint. No authentication or special privileges needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.1.16 or later
Vendor Advisory: https://www.usom.gov.tr/bildirim/tr-21-0795
Restart Required: Yes
Instructions:
1. Update LiderAhenk Lider module to version 2.1.16 or later. 2. Restart the Lider service. 3. Verify the API endpoint now requires proper authentication.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to the Lider module API using firewall rules
iptables -A INPUT -p tcp --dport [LIDER_PORT] -s [TRUSTED_NETWORK] -j ACCEPT
iptables -A INPUT -p tcp --dport [LIDER_PORT] -j DROP
Reverse Proxy Authentication
allPlace the Lider module behind a reverse proxy with authentication
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Lider module from untrusted networks
- Monitor API access logs for unauthorized configuration retrieval attempts
🔍 How to Verify
Check if Vulnerable:
Attempt to access the configuration API endpoint without authentication: curl http://[LIDER_HOST]:[PORT]/api/configurationsCheck Version:
dpkg -l | grep lider-moduleVerify Fix Applied:
Verify the same API endpoint now returns authentication error or requires valid credentials📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access to /api/configurations endpoint
- LDAP credential retrieval patterns in application logs
Network Indicators:
- HTTP GET requests to configuration API from unauthorized IPs
- Unusual LDAP queries following configuration access
SIEM Query:
source="lider.log" AND (uri="/api/configurations" OR message="configuration access") AND NOT user="authenticated"