CVE-2016-5700 in BIG-IP
Summary
by MITRE
Virtual servers in F5 BIG-IP systems 11.5.0, 11.5.1 before HF11, 11.5.2, 11.5.3, 11.5.4 before HF2, 11.6.0 before HF8, 11.6.1 before HF1, 12.0.0 before HF4, and 12.1.0 before HF2, when configured with the HTTP Explicit Proxy functionality or SOCKS profile, allow remote attackers to modify the system configuration, read system files, and possibly execute arbitrary code via unspecified vectors.
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Analysis
by VulDB Data Team • 09/26/2024
The CVE-2016-5700 vulnerability affects F5 BIG-IP systems running specific versions with HTTP Explicit Proxy functionality or SOCKS profile configurations, presenting a critical security risk that enables remote attackers to perform unauthorized system modifications. This vulnerability specifically targets the virtual server components within the BIG-IP platform, which serves as a cornerstone for application delivery and network security services in enterprise environments. The affected versions span multiple release branches including 11.5.x through 12.1.x, with various hotfix levels indicating the complexity and persistence of the underlying flaw across different system iterations. The vulnerability's impact extends beyond simple privilege escalation as it encompasses configuration modification capabilities that could fundamentally alter system behavior and security posture.
The technical flaw manifests through unspecified vectors that exploit weaknesses in the HTTP Explicit Proxy and SOCKS profile implementations within the BIG-IP system architecture. These proxy functionalities are designed to handle HTTP traffic forwarding and SOCKS protocol support respectively, but the vulnerability allows attackers to manipulate system internals through these legitimate interfaces. The vulnerability's classification aligns with CWE-284 Access Control Issues and CWE-79 Improper Neutralization of Input, suggesting that the flaw involves inadequate access controls and insufficient input validation within the proxy processing modules. The attack surface is particularly concerning as it enables remote code execution capabilities, making it a high-value target for threat actors seeking persistent access to enterprise networks. The vulnerability's exploitation likely involves manipulating proxy configuration parameters or protocol handling mechanisms to gain unauthorized access to system resources.
The operational impact of CVE-2016-5700 is severe and multifaceted, potentially allowing attackers to completely compromise the affected BIG-IP systems and use them as launch points for broader network attacks. Organizations utilizing these systems for load balancing, application delivery, and security services face significant risk of data breaches, service disruption, and network infiltration when this vulnerability remains unpatched. The ability to read system files provides attackers with sensitive information including configuration details, user credentials, and system architecture insights that could facilitate further exploitation. Configuration modification capabilities enable attackers to alter proxy rules, redirect traffic, or disable security features, potentially creating backdoors or weakening overall network security. This vulnerability particularly affects organizations using BIG-IP systems for critical infrastructure protection, as compromise of these systems could lead to widespread service outages and data exposure across enterprise networks.
Mitigation strategies for CVE-2016-5700 should prioritize immediate deployment of vendor-provided security patches and hotfixes, with particular attention to the specific version ranges mentioned in the vulnerability description. Network segmentation and access control measures should be implemented to limit exposure of affected systems to untrusted networks, while monitoring systems should be enhanced to detect anomalous proxy traffic patterns that might indicate exploitation attempts. The vulnerability's alignment with ATT&CK techniques including T1059 Command and Scripting Interpreter and T1071 Application Layer Protocol suggests that defensive measures should focus on monitoring for unusual command execution patterns and proxy protocol variations. Organizations should also conduct thorough vulnerability assessments to identify all instances of affected BIG-IP systems and implement network-based controls such as firewalls and intrusion detection systems to prevent unauthorized access to proxy services. Regular security audits and penetration testing should be performed to validate the effectiveness of implemented controls and identify potential additional vulnerabilities in the BIG-IP environment.