CVE-2022-33962 in BIG-IP
Summary
by MITRE • 08/04/2022
In BIG-IP Versions 17.0.x before 17.0.0.1, 16.1.x before 16.1.3.1, 15.1.x before 15.1.6.1, 14.1.x before 14.1.5.1, and all versions of 13.1.x, certain iRules commands may allow an attacker to bypass the access control restrictions for a self IP address, regardless of the port lockdown settings. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
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Analysis
by VulDB Data Team • 08/05/2022
The vulnerability identified as CVE-2022-33962 affects F5 BIG-IP load balancer appliances across multiple version branches including 17.0.x before 17.0.0.1, 16.1.x before 16.1.3.1, 15.1.x before 15.1.6.1, 14.1.x before 14.1.5.1, and all 13.1.x versions. This issue represents a critical access control bypass flaw that specifically targets the self IP address management functionality within the BIG-IP system. The vulnerability resides in the iRules processing engine which governs how the system handles network traffic and access controls for self IP addresses. When an attacker exploits this vulnerability, they can effectively circumvent the port lockdown mechanisms that are designed to restrict network access to specific ports and protocols for self IP addresses. This bypass occurs regardless of the configured port lockdown settings, meaning that even systems properly configured with restrictive port access policies can be compromised. The flaw essentially allows unauthorized network access to self IP addresses that should be protected by the system's access control policies, creating a significant security risk for organizations relying on BIG-IP for their network infrastructure.
The technical root cause of this vulnerability stems from improper validation and handling of iRules commands that interact with self IP address configurations. Specifically, the system fails to properly enforce access control restrictions when processing certain iRules that manipulate self IP address properties or access controls. This represents a classic weakness in input validation and privilege enforcement, classified under CWE-285: Improper Authorization. The vulnerability operates at the application layer within the BIG-IP configuration management system where iRules are executed and processed. Attackers can craft malicious iRules that exploit this flaw to gain unauthorized access to self IP addresses, effectively allowing them to bypass the system's intended network segmentation and access control policies. The exploitation requires an attacker to have some level of access to the BIG-IP configuration interface or to be able to inject malicious iRules into the system, which could occur through various attack vectors including configuration management interfaces or potentially through compromised administrative accounts.
The operational impact of CVE-2022-33962 is severe and potentially far-reaching for organizations using affected BIG-IP versions. This vulnerability directly undermines the fundamental security principles of network segmentation and access control that BIG-IP appliances are designed to enforce. An attacker who successfully exploits this vulnerability can potentially gain unauthorized access to network services bound to self IP addresses, which may include critical backend systems, databases, or internal network resources that should be protected from direct external access. The bypass of port lockdown settings means that even systems configured with strict port restrictions can be accessed by unauthorized parties, potentially leading to data breaches, service disruption, or further lateral movement within the network. This vulnerability affects organizations across various industries including financial services, healthcare, government, and telecommunications where network security and access control are paramount. The impact extends beyond immediate access violations to potentially enable more sophisticated attacks such as credential theft, data exfiltration, or system compromise through further exploitation of the compromised network access. Organizations may experience significant operational disruption and security incidents that could require immediate incident response activities and system restoration procedures.
Organizations affected by CVE-2022-33962 should immediately implement mitigations including applying the relevant security patches provided by F5 for their specific BIG-IP version. The vulnerability aligns with ATT&CK technique T1078.004: Valid Accounts - Cloud Accounts, as it may enable attackers to leverage compromised administrative access to manipulate iRules and bypass access controls. System administrators should also implement additional monitoring and logging of iRules configuration changes, particularly around self IP address access controls, to detect potential exploitation attempts. Network segmentation should be reviewed and enhanced to provide additional layers of protection beyond the BIG-IP access control mechanisms. Organizations should consider implementing privileged access management solutions and strict administrative access controls to limit who can modify iRules and access configuration interfaces. The remediation process should include comprehensive security assessments of all BIG-IP appliances to identify any potential unauthorized iRule modifications that may have occurred during the vulnerability window. Additionally, organizations should review their overall network security posture and implement network monitoring solutions that can detect unusual access patterns to self IP addresses, as this vulnerability could be leveraged as part of broader attack campaigns targeting network infrastructure. The vulnerability also highlights the importance of maintaining current security patches and following vendor security advisories to prevent exploitation of known vulnerabilities in critical network infrastructure components.