Horizon Alert
Summary of the vulnerability and why it matters
An authenticated user can exploit a path traversal vulnerability in Mattermost integrations to call arbitrary APIs using a system admin's auth token. This could allow unauthorized actions within the Mattermost instance, impacting data integrity and system control.
- Attackers can access system APIs.
- Sensitive Mattermost data could be compromised.
- Integration security controls are bypassed.
Attack Path
How an attacker could exploit the issue
An authenticated attacker can exploit this vulnerability by manipulating integration URLs to perform path traversal. This allows them to potentially call arbitrary API endpoints using a system admin's Mattermost authentication token, leading to unauthorized actions within the application.
- Requires authenticated user access.
- Targets integration action URLs.
- Uses path traversal for API calls.
Live Threat
Current exploitation, exposure, and threat context
Attackers may find this vulnerability appealing because it allows an authenticated user to call arbitrary APIs using a system administrator's token through path traversal. This could lead to significant data compromise or system takeover. The threat is amplified by the possibility of remote exploitation over the network.
- Exploitation requires authentication.
- No public exploit code observed.
- Vulnerability disclosed recently.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
Prioritize patching Mattermost Server for affected versions immediately due to the critical path traversal vulnerability. If patching is delayed, isolate affected services to prevent attackers from accessing arbitrary APIs using administrative tokens.
- Apply Mattermost security updates.
- Block or restrict integration URL calls.
- Monitor logs for suspicious API calls.
