CVE-2022-28134 in Bitbucket Server Integration Plugin
Summary
by MITRE • 03/29/2022
Jenkins Bitbucket Server Integration Plugin 3.1.0 and earlier does not perform permission checks in several HTTP endpoints, allowing attackers with Overall/Read permission to create, view, and delete BitBucket Server consumers.
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Analysis
by VulDB Data Team • 03/31/2022
The vulnerability identified as CVE-2022-28134 affects the Jenkins Bitbucket Server Integration Plugin version 3.1.0 and earlier, representing a critical authorization flaw that undermines the security posture of Jenkins environments integrating with Bitbucket Server. This issue stems from insufficient permission validation within multiple HTTP endpoints exposed by the plugin, creating a pathway for unauthorized privilege escalation. The flaw specifically targets the plugin's handling of BitBucket Server consumer management operations, which are fundamental components for establishing and maintaining integration between Jenkins and Bitbucket repositories.
The technical implementation of this vulnerability resides in the plugin's failure to enforce proper access controls when processing HTTP requests related to consumer operations. Attackers with merely Overall/Read permission can exploit this weakness to perform unauthorized actions including creating new BitBucket Server consumers, viewing existing consumer configurations, and deleting established consumers. This represents a classic case of insufficient authorization checks where the plugin assumes that any user with read access can perform administrative functions without proper verification of their privileges. The flaw operates at the application layer and specifically affects the plugin's REST API endpoints that handle consumer lifecycle management.
From an operational impact perspective, this vulnerability creates significant risk for organizations relying on Jenkins for continuous integration and deployment workflows that integrate with Bitbucket Server. An attacker who gains access to a Jenkins instance with Overall/Read permission can effectively compromise the integrity of the integration layer, potentially leading to unauthorized repository access, data exfiltration, or disruption of CI/CD pipelines. The ability to delete consumers can particularly impact ongoing builds and deployments, while the creation capability allows for persistent unauthorized access points. This vulnerability directly affects the principle of least privilege and can enable attackers to escalate their access within the Jenkins environment.
The security implications extend beyond immediate exploitation as this flaw can facilitate more sophisticated attack vectors within the broader Jenkins ecosystem. Organizations may find their Bitbucket integration compromised, potentially allowing attackers to manipulate build triggers, access sensitive configuration data, or establish backdoors through consumer creation. The vulnerability aligns with CWE-285, which addresses improper authorization issues in software systems, and can be mapped to ATT&CK technique T1078.004 for valid accounts and T1566.001 for phishing with valid accounts. Remediation efforts should focus on updating to the patched version of the plugin, implementing additional access controls, and conducting thorough security reviews of all integration plugins to ensure proper authorization mechanisms are in place.
Organizations should immediately upgrade to Jenkins Bitbucket Server Integration Plugin version 3.1.1 or later, which contains the necessary fixes for this authorization flaw. System administrators should also review existing consumer configurations and monitor for any unauthorized changes to Bitbucket integration settings. Additional mitigations include implementing network-level controls to restrict access to Jenkins endpoints, enabling multi-factor authentication, and conducting regular security audits of plugin configurations. The vulnerability demonstrates the importance of proper input validation and access control implementation in web applications, particularly those handling integration with external systems that may contain sensitive operational data.