CVE-2025-4573
📋 TL;DR
This vulnerability allows authenticated Mattermost administrators with specific permissions to perform LDAP search filter injection when linking LDAP groups. Attackers could potentially extract sensitive LDAP directory information or cause denial of service. Only administrators with PermissionSysconsoleWriteUserManagementGroups permission in affected Mattermost versions are impacted.
💻 Affected Systems
- Mattermost
📦 What is this software?
Mattermost Server by Mattermost
Mattermost Server by Mattermost
Mattermost Server by Mattermost
Mattermost Server by Mattermost
⚠️ Risk & Real-World Impact
Worst Case
Administrator could extract sensitive LDAP directory information including user credentials, group memberships, or other organizational data, potentially leading to lateral movement or privilege escalation.
Likely Case
Information disclosure from LDAP directory, potentially exposing user attributes, group structures, or limited sensitive data depending on LDAP configuration.
If Mitigated
Minimal impact if proper access controls limit administrator permissions and LDAP directory contains minimal sensitive information.
🎯 Exploit Status
Requires authenticated administrator access with specific permissions and LDAP configuration with objectGUID as Group ID Attribute.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Mattermost 10.7.2, 10.6.4, 10.5.5, 9.11.14 or later
Vendor Advisory: https://mattermost.com/security-updates
Restart Required: Yes
Instructions:
1. Backup Mattermost configuration and database. 2. Download patched version from official Mattermost repository. 3. Stop Mattermost service. 4. Install patched version. 5. Restart Mattermost service. 6. Verify version update.
🔧 Temporary Workarounds
Remove vulnerable permission
allTemporarily remove PermissionSysconsoleWriteUserManagementGroups permission from administrators until patching
Use Mattermost System Console to modify role permissions
Change LDAP Group ID Attribute
allChange Group ID Attribute from objectGUID to another attribute if possible
Modify LDAP configuration in Mattermost System Console
🧯 If You Can't Patch
- Restrict administrator permissions to only essential users
- Implement network segmentation to limit LDAP server exposure
🔍 How to Verify
Check if Vulnerable:
Check Mattermost version via System Console > About Mattermost and verify LDAP configuration uses objectGUID as Group ID AttributeCheck Version:
Check System Console > About Mattermost or run: mattermost versionVerify Fix Applied:
Verify Mattermost version is 10.7.2, 10.6.4, 10.5.5, 9.11.14 or later and test LDAP group linking functionality📡 Detection & Monitoring
Log Indicators:
- Unusual LDAP search patterns in Mattermost logs
- Multiple failed LDAP group linking attempts
- Administrator API calls to /api/v4/ldap/groups/*/link with unusual parameters
Network Indicators:
- Unusual LDAP query patterns from Mattermost server to LDAP directory
SIEM Query:
source="mattermost" AND (uri_path="/api/v4/ldap/groups/*/link" OR message="LDAP group link")