CVE-2020-2233 in Pipeline Maven Integration Plugin
Summary
by MITRE
A missing permission check in Jenkins Pipeline Maven Integration Plugin 3.8.2 and earlier allows users with Overall/Read access to enumerate credentials ID of credentials stored in Jenkins.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 11/08/2020
The vulnerability described in CVE-2020-2233 represents a critical authorization flaw within the Jenkins Pipeline Maven Integration Plugin ecosystem. This issue affects versions 3.8.2 and earlier, where a fundamental permission check has been omitted, creating an unintended access vector that undermines the security model of Jenkins. The vulnerability specifically targets the credential enumeration mechanism, allowing unauthorized users to discover credential identifiers stored within the Jenkins instance. This flaw directly impacts the principle of least privilege by enabling users with minimal access rights to gather sensitive information that should remain protected. The affected plugin serves as a bridge between Jenkins pipelines and maven build processes, making it a common component in continuous integration environments where credential management is paramount.
The technical implementation of this vulnerability stems from a missing authorization check within the plugin's credential handling logic. When users with Overall/Read access attempt to interact with the plugin's credential enumeration functionality, the system fails to validate whether the requesting user possesses sufficient privileges to access credential identifiers. This oversight creates a path where unauthorized access can occur through legitimate plugin interfaces, bypassing normal permission boundaries. The flaw manifests as an information disclosure vulnerability that operates at the application layer, specifically targeting Jenkins' credential store management system. According to CWE classification, this vulnerability maps to CWE-284: Improper Access Control, which encompasses issues where insufficient authorization checks allow unauthorized access to protected resources. The vulnerability demonstrates how seemingly benign functionality can become a security risk when proper access controls are not implemented.
The operational impact of this vulnerability extends beyond simple information disclosure, as credential enumeration provides attackers with the foundational knowledge needed for more sophisticated attacks. Once an attacker discovers credential IDs, they can potentially use this information to construct targeted attacks against specific credential stores, attempt brute force attacks against credential values, or leverage the information in combination with other vulnerabilities. The vulnerability affects organizations that rely on Jenkins for continuous integration and deployment processes, where credential exposure can lead to unauthorized access to source code repositories, build servers, and production environments. This issue particularly impacts environments where Jenkins is used in conjunction with maven-based build processes, as the plugin's functionality is commonly integrated into pipeline definitions. The attack surface is significant because the vulnerability allows for passive reconnaissance without requiring elevated privileges, making it particularly dangerous in environments where access control is not properly enforced at multiple levels.
Organizations should implement immediate mitigations including upgrading to Jenkins Pipeline Maven Integration Plugin version 3.8.3 or later, which contains the necessary permission checks to prevent unauthorized credential enumeration. System administrators should also review and enforce proper access controls within Jenkins, ensuring that users with Overall/Read access cannot perform credential-related operations. The implementation of additional monitoring for credential enumeration attempts can help detect potential exploitation attempts. Security teams should consider implementing network segmentation and access control lists to limit access to Jenkins instances, particularly those containing sensitive credentials. This vulnerability aligns with ATT&CK technique T1552.001: Credentials In Files, as it enables unauthorized access to credential information stored within the system. Regular security audits should be conducted to verify that all Jenkins plugins have been updated to their latest secure versions, and that proper authorization mechanisms are in place throughout the Jenkins ecosystem. Organizations should also consider implementing automated vulnerability scanning tools that can identify outdated plugins and potential authorization flaws in their Jenkins configurations.