CVE-2025-46121

Comprehensive Technical Analysis of CVE-2025-46121

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2025-46121 CVSS Score: 9.8

The vulnerability in CommScope Ruckus Unleashed prior to versions 200.15.6.212.14 and 200.17.7.0.139 involves a format string vulnerability in the functions stamgr_cfg_adpt_addStaFavourite and stamgr_cfg_adpt_addStaIot. This flaw allows a remote attacker to execute arbitrary code on the controller by exploiting the way client hostnames are processed.

Severity Evaluation:

• CVSS Score: 9.8 (Critical)
• Impact: Arbitrary code execution on the controller, leading to potential full system compromise.
• Exploitability: High, as it can be exploited both with and without authentication, and even without direct network access to the controller.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

1. Authenticated Exploitation:

   • An attacker with access to the authenticated endpoint /admin/_conf.jsp can send a crafted request containing malicious format specifiers in the client hostname.

2. Unauthenticated Exploitation:

   • An attacker can spoof the MAC address of a favourite station and embed malicious format specifiers in the DHCP hostname field. This method does not require direct network access to the controller.

Exploitation Methods:

• Format String Vulnerability: The attacker can inject format specifiers (e.g., %n, %s) into the client hostname, which are then passed to snprintf without proper sanitization. This can lead to arbitrary code execution.
• Spoofing MAC Address: By spoofing the MAC address of a favourite station, the attacker can manipulate the DHCP hostname field to include malicious format specifiers, exploiting the vulnerability without authentication.

3. Affected Systems and Software Versions

Affected Systems:

• CommScope Ruckus Unleashed controllers

Affected Software Versions:

• Versions prior to 200.15.6.212.14
• Versions prior to 200.17.7.0.139

4. Recommended Mitigation Strategies

Immediate Mitigation:

1. Update Software: Upgrade to the latest versions of CommScope Ruckus Unleashed (200.15.6.212.14 or 200.17.7.0.139 and above) which include patches for this vulnerability.
2. Network Segmentation: Implement strict network segmentation to limit access to the controller.
3. Access Control: Enforce strong authentication and access control measures to restrict access to the /admin/_conf.jsp endpoint.
4. Monitoring: Implement monitoring and logging to detect and respond to suspicious activities related to DHCP hostname fields and MAC address spoofing.

Long-Term Mitigation:

1. Regular Patching: Establish a regular patching and update schedule for all network devices.
2. Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate potential vulnerabilities.
3. Training: Provide training for IT staff on secure configuration and management of network devices.

5. Impact on Cybersecurity Landscape

Immediate Impact:

• Critical Infrastructure: Organizations relying on CommScope Ruckus Unleashed for network management are at risk of full system compromise, leading to potential data breaches and service disruptions.
• Supply Chain: Vendors and partners using affected devices may face cascading security issues.

Long-Term Impact:

• Increased Awareness: This vulnerability highlights the importance of secure coding practices and the need for robust input validation.
• Industry Standards: May influence the development of stricter security standards for network management devices.

6. Technical Details for Security Professionals

Vulnerability Details:

• Functions Affected: stamgr_cfg_adpt_addStaFavourite and stamgr_cfg_adpt_addStaIot
• Vulnerable Code: These functions pass the client hostname directly to snprintf as the format string, leading to a format string vulnerability.

Exploitation Steps:

1. Crafted Request: For authenticated exploitation, craft a request to /admin/_conf.jsp with a malicious client hostname.
2. MAC Spoofing: For unauthenticated exploitation, spoof the MAC address of a favourite station and embed malicious format specifiers in the DHCP hostname field.

Detection:

• Log Analysis: Monitor logs for unusual activities related to DHCP hostname fields and MAC address spoofing.
• Intrusion Detection Systems (IDS): Implement IDS rules to detect and alert on suspicious format string patterns in network traffic.

References:

• Sector7 Analysis
• Ruckus Wireless Security Bulletin

By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risk of exploitation and protect their network infrastructure.