EUVD-2025-19722

Comprehensive Technical Analysis of EUVD-2025-19722

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-19722 is an authentication bypass issue in GFI Kerio Control 9.4.5. This vulnerability arises due to an insecure default proxy configuration and weak access control in the GFIAgent service. The non-transparent proxy on TCP port 3128 can be exploited to forward unauthenticated requests to internal services, bypassing firewall restrictions and exposing internal management endpoints.

Severity Evaluation:

• Base Score: 9.5 (Critical)
• Base Score Version: 4.0
• Base Score Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

The high base score indicates a critical vulnerability due to the ease of exploitation (low complexity) and the significant impact on confidentiality, integrity, and availability. The attack vector is network-based, and no user interaction is required, making it highly exploitable.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

1. Network-Based Attack: An attacker can exploit the vulnerability remotely over the network.
2. Proxy Misconfiguration: The non-transparent proxy on TCP port 3128 can be used to forward unauthenticated requests.
3. Weak Access Control: The GFIAgent service has weak access control mechanisms, allowing unauthenticated access.

Exploitation Methods:

1. Proxy Forwarding: An attacker can send unauthenticated requests through the proxy on port 3128 to internal services.
2. Service Access: The attacker can access the GFIAgent service on ports 7995 and 7996, retrieve the appliance UUID, and issue administrative requests.
3. Administrative Access: Exploitation results in full administrative access to the Kerio Control appliance, allowing the attacker to perform any administrative action.

3. Affected Systems and Software Versions

Affected Systems:

• Product: Kerio Control
• Version: 9.4.5
• Vendor: GFI Software

Note: Other versions of Kerio Control may also be affected if they share the same proxy configuration and access control mechanisms.

4. Recommended Mitigation Strategies

1. Immediate Patching: Apply the latest security patches provided by GFI Software to mitigate the vulnerability.
2. Proxy Configuration: Review and secure the proxy configuration to prevent unauthenticated forwarding of requests.
3. Access Control: Strengthen access control mechanisms for the GFIAgent service to ensure only authenticated requests are processed.
4. Firewall Rules: Implement strict firewall rules to restrict access to internal management endpoints.
5. Network Segmentation: Segment the network to isolate critical services and reduce the attack surface.
6. Monitoring and Logging: Enhance monitoring and logging to detect and respond to any suspicious activity targeting the proxy and GFIAgent service.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations using GFI Kerio Control, particularly those in Europe. The potential for unauthenticated administrative access can lead to severe data breaches, unauthorized access to sensitive information, and disruption of critical services. This underscores the importance of timely patching and robust security practices to protect against such vulnerabilities.

6. Technical Details for Security Professionals

Technical Overview:

• Proxy Configuration: The non-transparent proxy on TCP port 3128 is configured to forward requests without proper authentication.
• GFIAgent Service: The service listens on ports 7995 and 7996 and has weak access control, allowing unauthenticated administrative requests.
• Exploitation Steps:
  1. Identify the target Kerio Control appliance.
  2. Send unauthenticated requests through the proxy on port 3128.
  3. Access the GFIAgent service on ports 7995 and 7996.
  4. Retrieve the appliance UUID and issue administrative requests.

Detection and Response:

• Intrusion Detection Systems (IDS): Deploy IDS to detect suspicious traffic targeting the proxy and GFIAgent service.
• Log Analysis: Regularly analyze logs for any unauthorized access attempts or administrative actions.
• Incident Response: Have an incident response plan in place to quickly address any detected exploitation attempts.

References:

• SSD Disclosure Advisory
• VulnCheck Advisory

Aliases:

• CVE-2025-34069

Assigner:

• VulnCheck

ENISA IDs:

• Product: 63531e18-02dc-3a5c-98d5-0a71188bba5c
• Vendor: 9d665ca4-5271-364c-a83b-7087e8d9e50d

This comprehensive analysis provides a clear understanding of the vulnerability, its potential impact, and the necessary steps to mitigate the risk. Organizations should prioritize addressing this critical issue to ensure the security and integrity of their systems.