CVE-2018-5528 in BIG-IP
Summary
by MITRE
Under certain conditions, TMM may restart and produce a core file while processing APM data on BIG-IP 13.0.1 or 13.1.0.4-13.1.0.7.
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Analysis
by VulDB Data Team • 03/29/2023
The vulnerability identified as CVE-2018-5528 affects F5 BIG-IP systems running specific versions of the Traffic Management Microkernel (TMM) component. This issue manifests when the system processes Application Performance Management (APM) data under certain conditions, leading to unexpected system restarts and core file generation. The affected versions include BIG-IP 13.0.1 and 13.1.0.4 through 13.1.0.7, representing a significant portion of the F5 BIG-IP product line that organizations rely upon for critical network infrastructure services.
The technical flaw resides within the TMM processing logic for APM data handling, where specific combinations of data inputs or processing states trigger an internal error condition that causes the TMM process to terminate unexpectedly. This termination results in a system restart and generates a core dump file that contains memory contents from the crashed process. The root cause demonstrates a lack of proper error handling and resource management within the APM data processing pipeline, which falls under the CWE-248 category of "Uncaught Exception" and represents a failure in the system's fault tolerance mechanisms.
The operational impact of this vulnerability extends beyond simple system availability concerns to encompass potential service disruption and data integrity risks. When the TMM restarts unexpectedly, it can interrupt ongoing network traffic flows and application connections, potentially causing denial of service conditions for users relying on the BIG-IP system for load balancing, application delivery, or security services. The generation of core files also consumes system resources and storage space, potentially leading to disk space exhaustion on the affected system. This vulnerability directly relates to the ATT&CK technique T1499.004 "Resource Hijacking" as it consumes system resources through unexpected process termination and core file generation, while also representing a potential pathway for attackers to disrupt services through controlled exploitation of the restart condition.
Organizations should prioritize applying the vendor-provided security patches and updates to address this vulnerability promptly. The mitigation strategy should include monitoring system logs for TMM restart events and core file generation patterns that may indicate exploitation attempts. Network administrators should implement additional monitoring controls to detect unusual restart patterns in production environments, particularly in systems handling critical APM data processing workloads. System hardening measures should also include configuring appropriate resource limits and core dump management policies to prevent disk space exhaustion while maintaining sufficient diagnostic information for security incident response. The vulnerability demonstrates the importance of comprehensive testing for edge cases in application performance management systems, particularly those handling complex data processing workflows that may encounter unexpected input conditions or state transitions.