CVE-2018-15329 in BIG-IP
Summary
by MITRE
On BIG-IP 14.0.0-14.0.0.2, 13.0.0-13.1.1.1, or 12.1.0-12.1.3.7, or Enterprise Manager 3.1.1, when authenticated administrative users run commands in the Traffic Management User Interface (TMUI), also referred to as the BIG-IP Configuration utility, restrictions on allowed commands may not be enforced.
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Analysis
by VulDB Data Team • 06/20/2023
The vulnerability identified as CVE-2018-15329 represents a critical authorization bypass flaw within F5 Networks BIG-IP application delivery controllers and Enterprise Manager systems. This weakness affects multiple versions including 14.0.0 through 14.0.0.2, 13.0.0 through 13.1.1.1, 12.1.0 through 12.1.3.7, and Enterprise Manager 3.1.1, making it a widespread concern across F5's product portfolio. The vulnerability specifically targets the Traffic Management User Interface, commonly known as TMUI or the BIG-IP Configuration utility, which serves as the primary administrative interface for configuring and managing BIG-IP systems. This flaw enables authenticated administrative users to execute commands that should normally be restricted, effectively undermining the security controls designed to protect sensitive system operations. The issue stems from improper enforcement of command restrictions within the TMUI, allowing privilege escalation through command injection mechanisms that bypass intended access controls.
The technical implementation of this vulnerability involves a failure in the input validation and command execution filtering mechanisms within the TMUI subsystem. When administrative users interact with the configuration utility, the system should enforce strict boundaries on which commands can be executed based on user privileges and system security policies. However, the flaw allows authenticated users to bypass these restrictions through carefully crafted command sequences that exploit weaknesses in the validation logic. This behavior aligns with CWE-285, which addresses improper authorization issues in security-critical components, and represents a direct violation of the principle of least privilege. The vulnerability operates at the application layer and can be exploited through the web-based administrative interface, making it particularly dangerous as it requires minimal additional attack vectors beyond initial authentication.
The operational impact of CVE-2018-15329 extends far beyond simple unauthorized command execution, as it fundamentally compromises the security posture of affected BIG-IP systems. An attacker who gains administrative access through this vulnerability can potentially execute arbitrary commands on the target system, leading to complete system compromise, data exfiltration, and disruption of critical network services. The vulnerability can be leveraged for lateral movement within networks where BIG-IP systems serve as traffic management points, potentially providing access to backend systems and sensitive infrastructure. Additionally, the compromised system can be used as a pivot point for further attacks, making it a significant threat to enterprise security. According to ATT&CK framework, this vulnerability maps to T1059 (Command and Scripting Interpreter) and T1068 (Exploitation for Privilege Escalation), as it allows for command execution and unauthorized privilege escalation. The impact is particularly severe given that BIG-IP systems often serve as critical infrastructure components in enterprise environments, making their compromise potentially devastating.
Organizations affected by CVE-2018-15329 should implement immediate mitigations including applying the latest security patches from F5 Networks, which address the command restriction enforcement flaws. Network segmentation and strict access controls should be enforced around affected systems, limiting administrative access to only trusted personnel with legitimate business requirements. Monitoring and logging of administrative activities within the TMUI should be enhanced to detect suspicious command execution patterns. The vulnerability demonstrates the importance of maintaining up-to-date security controls and highlights the need for comprehensive security testing of administrative interfaces. Organizations should also conduct thorough security assessments of their BIG-IP deployments to identify any additional vulnerabilities that may exist in similar components. The flaw serves as a reminder of the critical importance of proper access control implementation in security-critical systems and the potential consequences of insufficient input validation and privilege enforcement mechanisms. Security teams should also consider implementing additional security controls such as multi-factor authentication for administrative access and regular security audits of critical infrastructure components to prevent similar vulnerabilities from being exploited in the future.