CVE-2020-5880 in BIG-IP
Summary
by MITRE
Om BIG-IP 15.0.0-15.0.1.3 and 14.1.0-14.1.2.3, the restjavad process may expose a way for attackers to upload arbitrary files on the BIG-IP system, bypassing the authorization system. Resulting error messages may also reveal internal paths of the server.
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Analysis
by VulDB Data Team • 10/14/2020
The CVE-2020-5880 vulnerability affects F5 BIG-IP systems running specific versions of the BIG-IP configuration utility, creating a critical security exposure that allows unauthorized file upload capabilities. This vulnerability exists within the restjavad process which serves as a core component of the BIG-IP system architecture responsible for handling REST API requests and managing system configurations. The flaw stems from inadequate input validation and authorization checks within the file upload mechanism, enabling attackers to bypass the system's built-in security controls and potentially execute malicious code on the affected system.
The technical implementation of this vulnerability involves a path traversal or directory traversal issue within the restjavad process that fails to properly validate file upload requests. Attackers can exploit this weakness by crafting specially formatted requests that circumvent the authorization system, allowing them to upload arbitrary files to the BIG-IP system. The vulnerability is particularly dangerous because it operates at the system level where legitimate administrative functions are handled, making it difficult to distinguish between authorized and unauthorized file operations. The system's error handling also reveals internal server paths in error messages, providing attackers with additional information about the system's file structure and potentially aiding in further exploitation attempts.
The operational impact of CVE-2020-5880 extends beyond simple unauthorized file uploads, as it represents a significant compromise of the system's integrity and confidentiality. Successful exploitation could enable attackers to install backdoors, modify system configurations, or deploy malicious payloads that persist across system reboots. The vulnerability affects both version 15.0.0 through 15.0.1.3 and 14.1.0 through 14.1.2.3, indicating a widespread issue across multiple major releases of the BIG-IP platform. Organizations using these versions face elevated risk of data breaches, service disruption, and potential lateral movement within their networks, as BIG-IP systems often serve as critical network infrastructure components including load balancers, firewalls, and application delivery controllers.
Security professionals should consider this vulnerability in the context of the MITRE ATT&CK framework, particularly under the techniques related to privilege escalation and persistence. The vulnerability aligns with CWE-22 Path Traversal and CWE-285 Improper Authorization, both of which are commonly exploited in enterprise environments. Organizations should implement immediate mitigations including applying the vendor-provided security patches, restricting access to the restjavad service through network segmentation, and monitoring for suspicious file upload activities. The exposure of internal paths in error messages represents a secondary concern that should be addressed through proper error handling configurations, as this information disclosure can facilitate more sophisticated attacks. System administrators must also conduct thorough vulnerability assessments of their BIG-IP deployments to identify any potential exploitation attempts and ensure that all affected systems receive prompt patching to prevent unauthorized access and maintain the integrity of their network infrastructure.