CVE-2025-2407: Mobatime AMX MTAPI Auth Bypass Flaw

CVE-2025-2407 Overview

CVE-2025-2407 is a critical authentication bypass vulnerability affecting the Mobatime AMX MTAPI v6 Web-API running on IIS. The vulnerability stems from missing authentication and authorization controls in the Web-API, allowing adversaries to gain unrestricted access to the system via the network without providing valid credentials.

Critical Impact

Unauthenticated remote attackers can gain complete access to the Mobatime AMX MTAPI system, potentially compromising time management infrastructure, accessing sensitive data, and manipulating system configurations.

Affected Products

• Mobatime AMX MTAPI v6 (versions prior to 1.5)
• Mobatime AMX MTAPI Web-API on IIS

Discovery Timeline

• 2025-05-27 - CVE-2025-2407 published to NVD
• 2025-05-28 - Last updated in NVD database

Technical Details for CVE-2025-2407

Vulnerability Analysis

This vulnerability is classified as CWE-306 (Missing Authentication for Critical Function). The Mobatime AMX MTAPI v6 Web-API fails to implement proper authentication and authorization mechanisms, exposing critical API endpoints to unauthenticated network access. This design flaw allows any network-accessible adversary to interact with the API as if they were a legitimate authenticated user.

The attack can be executed remotely over the network with no user interaction required, making it trivial for attackers to exploit. The impact spans confidentiality, integrity, and availability—attackers can potentially read sensitive time management data, modify system configurations, and disrupt service operations.

Root Cause

The root cause of CVE-2025-2407 is the complete absence of authentication and authorization controls on the MTAPI Web-API endpoints. The API was deployed on IIS without implementing proper identity verification, session management, or role-based access controls. This means API requests are processed regardless of whether they originate from authenticated or authorized sources.

Attack Vector

The vulnerability is exploitable over the network without requiring authentication credentials or user interaction. An attacker with network access to the IIS server hosting the MTAPI Web-API can directly invoke API endpoints. Since no authentication checks are performed, all API functionality becomes accessible to unauthorized parties.

The attack surface includes any network path to the vulnerable IIS deployment—this could be internal network access, VPN connections, or in cases of misconfigured deployments, direct internet exposure. Attackers can enumerate available endpoints and leverage them to extract data, modify configurations, or disrupt time management operations.

Detection Methods for CVE-2025-2407

Indicators of Compromise

• Unusual or unauthorized API requests to the MTAPI Web-API endpoints from unexpected source IP addresses
• High volume of API calls without corresponding authentication events in IIS logs
• Configuration changes to time management systems that cannot be attributed to authorized personnel
• Network traffic patterns indicating reconnaissance or enumeration of MTAPI endpoints

Detection Strategies

• Monitor IIS access logs for requests to MTAPI endpoints that lack authentication headers or tokens
• Implement network intrusion detection rules to alert on direct access to MTAPI services from untrusted network segments
• Deploy web application firewall (WAF) rules to detect and block unauthenticated API access attempts
• Review audit logs for any unexpected changes to Mobatime AMX configurations

Monitoring Recommendations

• Enable verbose logging on the IIS server hosting MTAPI and forward logs to a SIEM for correlation
• Configure alerts for API access patterns that deviate from baseline authenticated user behavior
• Implement network segmentation monitoring to detect lateral movement targeting MTAPI infrastructure
• Establish baseline API usage patterns to identify anomalous unauthenticated access attempts

How to Mitigate CVE-2025-2407

Immediate Actions Required

• Upgrade Mobatime AMX MTAPI to version 1.5 or later, which addresses the authentication vulnerability
• Restrict network access to the MTAPI Web-API using firewall rules to allow only trusted IP addresses
• Place the IIS server hosting MTAPI behind a reverse proxy or WAF with authentication requirements
• Audit access logs for any signs of unauthorized access prior to patching

Patch Information

The vulnerability is fixed in Mobatime AMX MTAPI Version 1.5. Organizations should obtain the update through their Mobatime support channels. For additional details, refer to the Mobatime MTSL Vulnerability References.

Workarounds

• Implement network-level access controls to restrict API access to only authorized IP addresses or network segments
• Deploy a reverse proxy with authentication in front of the MTAPI Web-API endpoints
• Consider taking the vulnerable API offline until the patch can be applied if the system is exposed to untrusted networks
• Enable IIS IP address restrictions to limit access to known administrative systems only

# Example IIS IP restriction configuration
# Add to web.config to restrict access to specific IP ranges
# <system.webServer>
#   <security>
#     <ipSecurity allowUnlisted="false">
#       <add ipAddress="192.168.1.0" subnetMask="255.255.255.0" allowed="true"/>
#       <add ipAddress="10.0.0.100" allowed="true"/>
#     </ipSecurity>
#   </security>
# </system.webServer>