CVE-2022-41624 in BIG-IP
Summary
by MITRE • 10/20/2022
In BIG-IP versions 17.0.x before 17.0.0.1, 16.1.x before 16.1.3.2, 15.1.x before 15.1.7, 14.1.x before 14.1.5.2, and 13.1.x before 13.1.5.1, when a sideband iRule is configured on a virtual server, undisclosed traffic can cause an increase in memory resource utilization.
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Analysis
by VulDB Data Team • 10/20/2022
The vulnerability identified as CVE-2022-41624 affects F5 BIG-IP application delivery controllers across multiple version branches including 13.1.x through 17.0.x. This issue manifests when sideband iRules are configured on virtual servers, creating a resource exhaustion scenario that can lead to system instability. The flaw represents a memory management vulnerability that allows unauthorized users to consume excessive system resources through crafted traffic patterns. According to CWE-400, this vulnerability falls under the category of unspecified resource management issues, specifically involving memory consumption that can result in denial of service conditions. The affected versions demonstrate a critical gap in the iRule processing engine's ability to handle sideband traffic properly, creating an avenue for resource exhaustion attacks.
The technical implementation of this vulnerability stems from how the BIG-IP system processes sideband iRules when handling traffic that should remain undisclosed or isolated from normal processing paths. Sideband iRules are typically designed to process traffic without interfering with the main data path, but in the affected versions, these rules can inadvertently trigger memory allocation patterns that escalate with each processed packet. The flaw creates a condition where legitimate traffic can cause memory utilization to grow continuously, eventually exhausting available system resources. This behavior aligns with ATT&CK technique T1499.004 which involves resource exhaustion attacks targeting system memory. The vulnerability is particularly concerning because it can be triggered through normal network traffic patterns without requiring privileged access or complex exploitation techniques, making it an attractive target for denial of service attacks.
The operational impact of CVE-2022-41624 extends beyond simple service disruption to potentially compromise the availability of critical network infrastructure. Organizations running affected BIG-IP versions face the risk of complete system unavailability when attackers leverage this vulnerability to consume all available memory resources. The memory exhaustion can cause the system to crash or become unresponsive, requiring manual intervention to restore normal operations. Network administrators must consider that this vulnerability can affect high-traffic environments where sideband iRules are commonly deployed for monitoring or logging purposes. The attack surface is broad as any virtual server configured with sideband iRules presents a potential target, making this vulnerability particularly dangerous for organizations with extensive BIG-IP deployments.
Mitigation strategies for CVE-2022-41624 should prioritize immediate patching of affected systems to versions 16.1.3.2, 15.1.7, 14.1.5.2, and 13.1.5.1 where available. Organizations should also implement traffic monitoring to detect unusual memory consumption patterns that may indicate exploitation attempts. Network segmentation and access controls should be reviewed to limit potential attack vectors, particularly for systems running sideband iRules. Configuration reviews should focus on identifying and removing unnecessary sideband iRules where possible, reducing the attack surface. The implementation of resource limits and monitoring alerts for memory utilization can provide early detection capabilities for potential exploitation attempts. Security teams should also consider implementing network-based intrusion detection systems that can identify and block traffic patterns associated with this specific vulnerability, as outlined in the ATT&CK framework's defensive strategies for resource exhaustion attacks.