CVE-2018-5510 in BIG-IP
Summary
by MITRE
On F5 BIG-IP 11.5.4 HF4-11.5.5, the Traffic Management Microkernel (TMM) may restart when processing a specific sequence of packets on IPv6 virtual servers.
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Analysis
by VulDB Data Team • 02/28/2023
The vulnerability identified as CVE-2018-5510 affects F5 BIG-IP systems running specific versions of the Traffic Management Microkernel, particularly impacting IPv6 virtual server configurations. This issue represents a significant reliability concern within enterprise network infrastructure, as it can lead to service disruption and potential denial of service conditions. The vulnerability manifests when the TMM component encounters a particular sequence of IPv6 packets that triggers an unexpected system restart, creating operational instability in critical network environments.
The technical flaw resides within the packet processing logic of the Traffic Management Microkernel, where specific IPv6 packet sequences cause memory management issues or buffer overflows that result in the TMM process terminating unexpectedly. This behavior aligns with CWE-121, which describes heap-based buffer overflow conditions that can lead to arbitrary code execution or system crashes. The vulnerability exploitation requires precise packet sequencing that targets memory corruption within the TMM's IPv6 processing module, making it a sophisticated yet potentially exploitable weakness in network security infrastructure.
The operational impact of this vulnerability extends beyond simple service disruption, as it can compromise network availability and reliability for organizations relying on F5 BIG-IP appliances for load balancing and traffic management. When the TMM restarts, all active connections are terminated, requiring clients to reestablish sessions and potentially leading to service degradation or complete outages. This vulnerability particularly affects environments where IPv6 traffic is processed, making it critical for organizations with dual-stack configurations or IPv6-only deployments. The restart behavior can be leveraged by attackers to perform denial of service attacks against critical network services.
Organizations should implement immediate mitigations including applying the latest F5 security patches and hotfixes that address the specific TMM restart condition. Network administrators should also consider implementing monitoring solutions to detect unusual restart patterns and establish incident response procedures for rapid recovery. The vulnerability demonstrates the importance of maintaining up-to-date security patches in critical infrastructure components and aligns with ATT&CK technique T1499, which covers network disruption attacks through system restarts or crashes. Additional protective measures include implementing network segmentation to limit exposure, configuring redundant systems to maintain availability during patching operations, and establishing robust backup and recovery procedures for network infrastructure components.