CVE-2014-9326 in BIG-IP
Summary
by MITRE
The automatic signature update functionality in the (1) Phone Home feature in F5 BIG-IP LTM, AAM, AFM, Analytics, APM, GTM, and Link Controller 11.5.0 through 11.6.0, ASM 10.0.0 through 11.6.0, and PEM 11.3.0 through 11.6.0 and the (2) Call Home feature in ASM 10.0.0 through 11.6.0 and PEM 11.3.0 through 11.6.0 does not properly validate server SSL certificates, which allows remote attackers to conduct man-in-the-middle attacks via a crafted certificate.
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Analysis
by VulDB Data Team • 05/10/2022
The vulnerability described in CVE-2014-9326 represents a critical security flaw in F5 BIG-IP systems that affects multiple modules including Local Traffic Manager AAM AFM Analytics APM GTM and Link Controller as well as Application Security Manager and Policy Enforcement Manager. This issue specifically targets the automatic signature update functionality and call home features that are designed to periodically connect to F5 servers for security updates and diagnostic reporting. The vulnerability stems from inadequate SSL certificate validation mechanisms within these automated communication channels which creates a pathway for malicious actors to intercept and manipulate the update processes.
The technical implementation flaw resides in the certificate validation logic that fails to properly verify the authenticity and integrity of SSL certificates presented by remote servers during the automatic update process. This weakness allows attackers to perform man-in-the-middle attacks by presenting forged SSL certificates that appear legitimate to the F5 system. The vulnerability affects versions 11.5.0 through 11.6.0 of the affected modules and 10.0.0 through 11.6.0 for ASM and PEM components, representing a substantial attack surface across multiple F5 security products. The improper certificate validation occurs during the TLS handshake process when the system should be verifying certificate chains against trusted root authorities but instead accepts potentially malicious certificates.
The operational impact of this vulnerability is severe as it enables remote attackers to compromise the security update mechanisms of F5 BIG-IP systems. Attackers can intercept and modify security signatures that are crucial for protecting against emerging threats, potentially allowing them to bypass security controls or deploy malicious updates that could compromise the entire system. The vulnerability also affects the call home functionality which typically sends diagnostic information back to F5 servers, creating additional attack vectors for information exfiltration and system compromise. Organizations may unknowingly accept malicious updates that could provide attackers with persistent access to their networks while simultaneously weakening their security posture through compromised signature databases.
This vulnerability maps to CWE-295 which specifically addresses improper certificate validation and aligns with ATT&CK technique T1566 for credential access through man-in-the-middle attacks. The attack pattern follows the typical MITM methodology where attackers establish connections to systems using forged certificates and then intercept communications between the F5 device and F5 servers. Organizations should implement immediate mitigations including disabling automatic update features until patches are applied, implementing network segmentation to limit access to update servers, and monitoring for unusual network activity related to update communications. The vulnerability demonstrates the critical importance of certificate validation in security systems and the potential for automated update mechanisms to become attack vectors when proper validation controls are absent.