CVE-2018-15314 in BIG-IP AFM
Summary
by MITRE
On F5 BIG-IP AFM 13.0.0-13.1.1.1 and 12.1.0-12.1.3.6, there is a Reflected Cross Site Scripting vulnerability in undisclosed TMUI page.
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Analysis
by VulDB Data Team • 05/30/2023
The vulnerability identified as CVE-2018-15314 represents a critical reflected cross site scripting flaw within the F5 BIG-IP Advanced Firewall Manager component. This security weakness affects specific versions of the F5 BIG-IP platform including releases 13.0.0 through 13.1.1.1 and 12.1.0 through 12.1.3.6. The issue manifests in an undisclosed TMUI page, which serves as the management interface for F5 BIG-IP systems. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically the reflected variant where malicious scripts are reflected from the web server back to the user's browser. The TMUI (Traffic Management User Interface) component acts as the primary administrative interface for configuring and managing F5 BIG-IP services, making this vulnerability particularly dangerous as it could be exploited by attackers to compromise the entire firewall management system.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious URL containing XSS payload that gets reflected back to the victim's browser through the affected TMUI page. When a user with administrative privileges clicks on the crafted link, the malicious script executes within the context of the victim's browser session, potentially allowing attackers to steal session cookies, perform unauthorized administrative actions, or redirect users to malicious sites. The reflected nature of this vulnerability means that the malicious code is not stored on the server but rather injected through the request parameters, making it particularly challenging to detect and prevent through traditional security measures. This vulnerability represents a significant risk to organizations relying on F5 BIG-IP systems for network security management.
The operational impact of CVE-2018-15314 extends beyond simple script execution as it provides attackers with potential access to critical network infrastructure management interfaces. Successful exploitation could enable attackers to gain administrative privileges over the firewall system, potentially allowing them to modify firewall rules, access sensitive network configurations, or establish persistent access to the organization's network perimeter. The vulnerability affects the Advanced Firewall Manager component which is responsible for implementing and managing network security policies, making it a prime target for attackers seeking to compromise network defenses. Organizations using affected versions of F5 BIG-IP systems face significant risk of unauthorized access to their network security infrastructure, potentially leading to complete network compromise or data exfiltration.
Organizations should immediately implement mitigation strategies including applying the official F5 security patches released for this vulnerability, which address the reflected XSS issue in the TMUI interface. Network segmentation and access controls should be strengthened to limit administrative access to the affected systems, while implementing web application firewalls to detect and block malicious requests containing XSS payloads. Regular security monitoring and log analysis should be enhanced to detect potential exploitation attempts, and user education programs should be implemented to prevent social engineering attacks that might leverage this vulnerability. The ATT&CK framework categorizes this vulnerability under T1059.007 for Scripting and T1566.001 for Phishing, highlighting the need for comprehensive defensive measures. Organizations should also consider implementing network access controls to restrict direct access to the TMUI interface from untrusted networks and ensure that administrative access is only permitted from trusted IP addresses or through secure VPN connections to minimize exposure risk.