CVE-2020-5887 in BIG-IP
Summary
by MITRE
On versions 15.1.0-15.1.0.1, 15.0.0-15.0.1.2, and 14.1.0-14.1.2.3, BIG-IP Virtual Edition (VE) may expose a mechanism for remote attackers to access local daemons and bypass port lockdown settings.
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Analysis
by VulDB Data Team • 10/14/2020
The vulnerability identified as CVE-2020-5887 affects BIG-IP Virtual Edition appliances running specific software versions including 15.1.0 through 15.1.0.1, 15.0.0 through 15.0.1.2, and 14.1.0 through 14.1.2.3. This represents a critical security flaw that undermines the fundamental network isolation principles typically enforced by the BIG-IP system. The issue stems from improper implementation of port lockdown mechanisms that are designed to restrict access to local daemons and system services, creating an unintended attack surface that remote adversaries can exploit to gain unauthorized access to internal system components.
The technical flaw manifests as a failure in the BIG-IP Virtual Edition's security model where local daemons that should be restricted to localhost access are inadvertently exposed to remote network connections. This bypass of port lockdown settings creates a pathway for attackers to directly interact with system services that normally operate within a protected internal network segment. The vulnerability specifically impacts the appliance's ability to enforce proper network segmentation, allowing remote attackers to establish connections to local daemons that should remain inaccessible from external networks. This represents a direct violation of the principle of least privilege and network isolation that security-conscious organizations rely upon to protect their infrastructure.
The operational impact of this vulnerability is severe and far-reaching for organizations utilizing affected BIG-IP appliances. Remote attackers who successfully exploit this vulnerability can potentially access sensitive system information, manipulate local services, and escalate their privileges within the appliance environment. The exposure of local daemons creates opportunities for attackers to perform reconnaissance activities, gather system configuration details, and potentially establish persistent access points within the network infrastructure. Organizations may experience unauthorized data access, system compromise, and potential lateral movement within their network environment as attackers leverage this vulnerability to gain deeper access to their infrastructure.
Security professionals should prioritize immediate remediation of this vulnerability through official software updates provided by F5 Networks. The mitigation strategy involves upgrading affected BIG-IP Virtual Edition appliances to versions that contain patches addressing the port lockdown bypass mechanism. Organizations should also implement network segmentation measures to limit access to affected appliances and monitor network traffic for signs of exploitation attempts. This vulnerability aligns with CWE-284 (Improper Access Control) and represents a significant weakness in the appliance's security architecture that can be exploited through techniques categorized under the ATT&CK framework's privilege escalation and lateral movement tactics. The vulnerability demonstrates the critical importance of maintaining up-to-date security configurations and the potential consequences of inadequate network isolation controls in enterprise security infrastructure.