CVE-2025-55113

Comprehensive Technical Analysis of CVE-2025-55113

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2025-55113 CVSS Score: 9

The vulnerability described in CVE-2025-55113 involves a flaw in the Access Control List (ACL) enforcement mechanism of the Control-M/Agent when using the C router. Specifically, the verification process stops at the first NULL byte encountered in the email address referenced in the client certificate. This allows an attacker to bypass configured ACLs by using a specially crafted certificate.

Severity Evaluation:

• CVSS Score: 9 (Critical)
• Impact: High
• Exploitability: High

The high CVSS score indicates a critical vulnerability that could lead to significant security breaches if exploited. The ability to bypass ACLs can result in unauthorized access to sensitive systems and data.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

1. Certificate Manipulation: An attacker could craft a client certificate with a specially formatted email address containing a NULL byte.
2. Network Interception: If an attacker can intercept network traffic, they could inject a malicious certificate during the authentication process.
3. Internal Threats: Insiders with knowledge of the system could exploit this vulnerability to gain unauthorized access.

Exploitation Methods:

1. Certificate Forgery: Creating a certificate with a NULL byte in the email address field to bypass ACL verification.
2. Man-in-the-Middle (MitM) Attacks: Intercepting and modifying certificates in transit to include the NULL byte.
3. Social Engineering: Tricking users into accepting or using malicious certificates.

3. Affected Systems and Software Versions

Affected Systems:

• Control-M/Agent versions 9.0.18 to 9.0.20 (default configuration)
• Potentially earlier unsupported versions
• Newer versions if the JAVA_AR setting is configured to use the C router

Software Versions:

• Control-M/Agent 9.0.18
• Control-M/Agent 9.0.19
• Control-M/Agent 9.0.20
• Earlier unsupported versions
• Newer versions with specific configurations

4. Recommended Mitigation Strategies

Immediate Actions:

1. Upgrade Software: Upgrade to a supported version of Control-M/Agent that addresses this vulnerability.
2. Disable C Router: If upgrading is not immediately possible, disable the use of the C router.
3. Monitor Network Traffic: Implement enhanced monitoring to detect and alert on suspicious certificate usage.

Long-Term Mitigations:

1. Patch Management: Ensure a robust patch management process to apply security updates promptly.
2. Certificate Validation: Implement additional certificate validation mechanisms to detect and block malicious certificates.
3. Access Controls: Review and strengthen ACL configurations to minimize the risk of unauthorized access.

5. Impact on Cybersecurity Landscape

The discovery of CVE-2025-55113 highlights the importance of robust certificate validation and ACL enforcement mechanisms. This vulnerability underscores the need for:

• Continuous Monitoring: Ongoing monitoring of systems for unusual activities.
• Regular Audits: Regular security audits to identify and mitigate vulnerabilities.
• User Education: Training users on the risks associated with certificate manipulation and social engineering attacks.

6. Technical Details for Security Professionals

Technical Overview:

• Vulnerability Type: ACL Bypass
• Affected Component: Control-M/Agent ACL enforcement mechanism
• Trigger Condition: NULL byte in the email address field of the client certificate

Detection Methods:

1. Log Analysis: Review logs for unusual ACL bypass attempts or unauthorized access.
2. Certificate Inspection: Implement tools to inspect certificates for NULL bytes in the email address field.
3. Network Anomaly Detection: Use network anomaly detection systems to identify suspicious certificate usage patterns.

Remediation Steps:

1. Update Software: Apply the latest patches and updates from the vendor.
2. Configuration Changes: Modify the JAVA_AR setting to avoid using the C router if upgrading is not possible.
3. Enhanced Monitoring: Deploy advanced monitoring solutions to detect and respond to potential exploitation attempts.

References:

• BMC Knowledge Article 1
• BMC Knowledge Article 2

By addressing this vulnerability promptly and comprehensively, organizations can significantly reduce the risk of unauthorized access and potential data breaches.