CVE-2025-53900
📋 TL;DR
CVE-2025-53900 is a privilege escalation vulnerability in Kiteworks MFT where authorized users can gain elevated permissions through improper role definitions in Connections management. This affects all Kiteworks MFT deployments before version 9.1.0 where users have access to manage Connections.
💻 Affected Systems
- Kiteworks MFT
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Authorized users could gain administrative privileges, potentially accessing sensitive data, modifying configurations, or disrupting file transfer workflows.
Likely Case
Users with existing permissions could escalate to perform unauthorized actions within their scope of access, such as modifying connections they shouldn't control.
If Mitigated
With proper access controls and monitoring, impact would be limited to authorized users gaining slightly elevated permissions within their existing access scope.
🎯 Exploit Status
Exploitation requires authenticated access and knowledge of the role/permission system. The advisory suggests it's relatively straightforward for authorized users.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.1.0
Vendor Advisory: https://github.com/kiteworks/security-advisories/security/advisories/GHSA-gjq3-8v6p-2h6h
Restart Required: Yes
Instructions:
1. Backup current configuration and data. 2. Download Kiteworks MFT version 9.1.0 or later from official sources. 3. Follow vendor upgrade documentation for your deployment type. 4. Restart services after upgrade. 5. Verify functionality post-upgrade.
🔧 Temporary Workarounds
Restrict Connection Management Permissions
allTemporarily remove or restrict permissions for managing Connections from non-administrative users until patching can be completed.
Enhanced Monitoring of Connection Changes
allImplement additional logging and alerting for any Connection management activities by non-administrative users.
🧯 If You Can't Patch
- Implement strict role-based access control with minimal necessary permissions for Connection management
- Enable detailed audit logging for all Connection-related activities and review logs regularly
🔍 How to Verify
Check if Vulnerable:
Check Kiteworks MFT version via admin interface or configuration files. If version is below 9.1.0, the system is vulnerable.Check Version:
Check admin dashboard or configuration files for version information specific to your deployment method.Verify Fix Applied:
After upgrading, verify version is 9.1.0 or higher and test that users cannot escalate privileges through Connection management.📡 Detection & Monitoring
Log Indicators:
- Unauthorized or unexpected Connection creation/modification
- User permission changes related to Connection management
- Failed privilege escalation attempts in audit logs
Network Indicators:
- Unusual patterns of Connection management API calls from non-admin users
SIEM Query:
source="kiteworks" AND (event_type="connection_modified" OR event_type="permission_change") AND user_role!="admin"