CVE-2024-23976 in BIG-IP
Summary
by MITRE • 02/14/2024
When running in Appliance mode, an authenticated attacker assigned the Administrator role may be able to bypass Appliance mode restrictions utilizing iAppsLX templates on a BIG-IP system. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated
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Analysis
by VulDB Data Team • 09/05/2025
This vulnerability exists within F5 Networks BIG-IP systems operating in appliance mode, where administrative privileges are typically restricted to prevent unauthorized modifications to the core system configuration. The flaw specifically affects systems that utilize iAppsLX templates, which are containerized applications designed to extend the functionality of BIG-IP systems. When an authenticated user with administrator privileges attempts to bypass appliance mode restrictions, they can exploit a weakness in the template processing mechanism that allows execution of commands outside the intended operational boundaries. This represents a critical privilege escalation vulnerability that undermines the fundamental security model of appliance mode, which is designed to isolate and control administrative access to prevent accidental or malicious system compromise. The vulnerability is classified under CWE-284 (Improper Access Control) and aligns with ATT&CK technique T1078.004 (Valid Accounts: Cloud Accounts) when exploited by authenticated users.
The technical implementation of this vulnerability stems from insufficient validation of template parameters within the iAppsLX framework when processing user-supplied inputs. Attackers can craft malicious iAppsLX templates that contain embedded commands or references to system resources that should be restricted in appliance mode. When the system processes these templates, the validation logic fails to properly sanitize or restrict access to underlying system components, allowing the execution of arbitrary commands with elevated privileges. This occurs because the template engine does not adequately enforce the security boundaries that should exist between the appliance mode environment and the underlying operating system resources. The flaw is particularly concerning because it leverages legitimate administrative functionality to achieve unauthorized access, making detection more challenging and exploiting the trust relationship between the user and the system.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables attackers to gain complete control over the BIG-IP appliance and potentially compromise the entire network infrastructure it protects. An attacker who successfully exploits this vulnerability can modify system configurations, install malicious software, access sensitive data stored on the appliance, and establish persistence mechanisms that survive system reboots. The implications are particularly severe for organizations relying on BIG-IP systems for critical network security functions such as load balancing, application delivery, and security policy enforcement. Additionally, the vulnerability affects systems that have reached end of technical support, meaning organizations may be running unsupported software versions that lack security patches, increasing the risk profile significantly. Organizations using older BIG-IP versions are especially vulnerable as they may not have access to the latest security updates and mitigations.
Mitigation strategies for this vulnerability require immediate action to either patch the affected systems or implement compensating controls. Organizations should prioritize applying the latest security patches from F5 Networks that address this specific vulnerability, as these updates contain fixes for the template validation logic and access control mechanisms. When patching is not immediately possible, administrators should implement network segmentation to limit access to BIG-IP appliances to trusted networks only, and enforce strict monitoring of template creation and deployment activities. Additional protective measures include disabling unnecessary iAppsLX template functionality, implementing robust user access controls, and conducting regular security audits of appliance configurations. Organizations should also consider implementing behavioral analytics to detect anomalous template processing activities that may indicate exploitation attempts. The vulnerability highlights the importance of maintaining up-to-date security configurations and demonstrates the risks associated with running unsupported software versions in production environments.