CVE-2023-29057
📋 TL;DR
This vulnerability allows authenticated users to bypass intended Active Directory permission restrictions when specific LDAP configuration is used. It affects Lenovo XClarity Controller (XCC) systems configured with 'Local First, then LDAP' authentication mode. Attackers with valid local credentials could gain elevated privileges beyond what their AD permissions should allow.
💻 Affected Systems
- Lenovo XClarity Controller (XCC)
📦 What is this software?
Thinkagile Hx Enclosure Firmware by Lenovo
⚠️ Risk & Real-World Impact
Worst Case
Privilege escalation to administrative control of XCC management interface, potentially leading to full compromise of managed server hardware and ability to modify firmware/bios settings.
Likely Case
Authenticated users gaining unauthorized access to management functions beyond their intended role, potentially modifying system configurations or accessing sensitive hardware information.
If Mitigated
Limited impact with proper network segmentation and monitoring, though privilege escalation risk remains for authenticated users.
🎯 Exploit Status
Exploitation requires valid local user credentials and specific LDAP configuration. No public exploit code available as of knowledge cutoff.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: XCC firmware version 2.10.0 or later
Vendor Advisory: https://support.lenovo.com/us/en/product_security/LEN-118321
Restart Required: Yes
Instructions:
1. Download XCC firmware version 2.10.0 or later from Lenovo Support. 2. Log into XCC web interface. 3. Navigate to Maintenance > Firmware Update. 4. Upload and apply the firmware update. 5. Reboot the XCC controller when prompted.
🔧 Temporary Workarounds
Change Authentication Method
allSwitch from 'Local First, then LDAP' to 'LDAP Only' authentication mode
XCC web interface: Configuration > Users > Authentication > Change method to 'LDAP Only'
Disable Local Accounts
allRemove or disable local user accounts to force all authentication through LDAP
XCC web interface: Configuration > Users > Local Users > Disable or delete local accounts
🧯 If You Can't Patch
- Change authentication method to 'LDAP Only' instead of 'Local First, then LDAP'
- Implement strict network segmentation to limit XCC interface access to authorized administrators only
- Monitor XCC authentication logs for unusual local account activity
- Review and minimize local user accounts with administrative privileges
🔍 How to Verify
Check if Vulnerable:
1. Log into XCC web interface. 2. Check firmware version under Maintenance > Firmware Information. 3. Verify if version is below 2.10.0. 4. Check authentication method under Configuration > Users > Authentication.Check Version:
From XCC web interface: Maintenance > Firmware Information shows current versionVerify Fix Applied:
1. Confirm firmware version is 2.10.0 or higher. 2. Verify authentication method is NOT set to 'Local First, then LDAP'. 3. Test user permissions to ensure AD restrictions are properly enforced.📡 Detection & Monitoring
Log Indicators:
- Multiple failed LDAP authentication attempts followed by successful local authentication
- User accessing functions beyond their AD-assigned role
- Authentication method changes in configuration logs
Network Indicators:
- Unusual XCC management interface access patterns
- Authentication traffic showing local login when LDAP should be primary
SIEM Query:
source="xcc" AND (event_type="authentication" AND auth_method="local" AND config_auth="local_first_ldap")