CVE-2020-2287 in Audit Trail Plugin
Summary
by MITRE • 10/08/2020
Jenkins Audit Trail Plugin 3.6 and earlier applies pattern matching to a different representation of request URL paths than the Stapler web framework uses for dispatching requests, which allows attackers to craft URLs that bypass request logging of any target URL.
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Analysis
by VulDB Data Team • 11/17/2020
The vulnerability identified as CVE-2020-2287 resides within the Jenkins Audit Trail Plugin version 3.6 and earlier, representing a critical security flaw that undermines the integrity of audit logging mechanisms. This issue stems from a fundamental mismatch in how the plugin processes and matches URL patterns compared to the Stapler web framework that Jenkins employs for request routing. The Stapler framework utilizes a specific internal representation of URL paths for dispatching requests, while the Audit Trail Plugin applies its own pattern matching against a different representation of the same paths. This discrepancy creates a potential attack vector where malicious actors can construct specially crafted URLs that evade detection by the audit logging system.
The technical implementation of this vulnerability demonstrates a classic case of inconsistent data handling and pattern matching logic within web application security controls. When Jenkins processes incoming HTTP requests, the Stapler framework normalizes and represents URL paths in a particular format that determines how requests are routed to appropriate handlers. However, the Audit Trail Plugin maintains its own internal representation of these paths for logging purposes, and the pattern matching algorithms used by the plugin do not align with the actual paths used by Stapler for request dispatching. This misalignment allows attackers to exploit the difference in path representations to craft URLs that match the plugin's logging patterns while actually targeting different endpoints, effectively bypassing audit logging for sensitive operations.
The operational impact of CVE-2020-2287 extends beyond simple audit evasion, creating a significant security risk for Jenkins environments that rely on comprehensive logging for compliance and forensic analysis. Organizations utilizing Jenkins with the affected plugin version face the risk of unauthorized access going undetected, as attackers can manipulate their actions to avoid leaving traces in audit logs. This vulnerability directly impacts the principle of least privilege and audit integrity, as malicious users can perform operations such as accessing restricted configuration settings, modifying build parameters, or executing unauthorized administrative functions while maintaining a clean audit trail. The flaw particularly affects environments where audit logging is critical for security monitoring, compliance requirements, or incident response procedures.
From a cybersecurity perspective, this vulnerability aligns with CWE-200, which addresses "Information Exposure," and represents a failure in proper access control enforcement and audit logging consistency. The issue also relates to ATT&CK technique T1562.001, "Impair Defenses: Disable or Modify Tools," as it enables attackers to circumvent security monitoring mechanisms. Organizations should prioritize immediate remediation by upgrading to Jenkins Audit Trail Plugin version 3.7 or later, which addresses the path representation inconsistency. Additionally, security teams should implement network-based monitoring solutions that can detect anomalous request patterns independent of audit logging, and consider implementing additional security controls such as request rate limiting, IP whitelisting, and comprehensive security scanning of all Jenkins endpoints to ensure complete protection against similar vulnerabilities in other components. The vulnerability serves as a reminder of the critical importance of maintaining consistency across security controls and the potential consequences of fragmented security implementations within complex web applications.