CVE-2022-43421 in Tuleap Git Branch Source Plugin
Summary
by MITRE • 10/19/2022
A missing permission check in Jenkins Tuleap Git Branch Source Plugin 3.2.4 and earlier allows unauthenticated attackers to trigger Tuleap projects whose configured repository matches the attacker-specified value.
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Analysis
by VulDB Data Team • 05/09/2025
The vulnerability identified as CVE-2022-43421 represents a critical authorization flaw within the Jenkins Tuleap Git Branch Source Plugin version 3.2.4 and earlier. This issue stems from a missing permission check that allows unauthenticated attackers to exploit the plugin's functionality without proper authentication. The vulnerability specifically affects systems where Jenkins is configured to integrate with Tuleap Git repositories through the affected plugin, creating a pathway for unauthorized access to project resources. The flaw exists in the plugin's handling of repository configuration parameters, where attacker-controlled inputs can trigger repository operations without verifying user credentials or permissions. This represents a significant security gap in Jenkins' access control mechanisms, particularly when integrating with external Git hosting platforms like Tuleap.
The technical implementation of this vulnerability occurs at the plugin level where repository operations are executed based on attacker-specified parameters without proper authorization validation. When an attacker sends a crafted request to the Jenkins instance, the plugin processes the repository configuration data without checking if the requester possesses the necessary permissions to perform the requested operations. This missing validation allows for arbitrary repository triggers, potentially enabling attackers to initiate builds, access project information, or perform other repository-related actions. The vulnerability's impact is amplified by the fact that Jenkins typically operates in environments where it serves as a central automation hub, making it a prime target for exploitation. The flaw can be categorized under CWE-863, which addresses "Incorrect Authorization" issues, specifically targeting scenarios where authorization checks are missing or improperly implemented.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it can enable attackers to leverage Jenkins as a staging point for further exploitation within the development infrastructure. An attacker could potentially trigger builds on sensitive projects, access confidential source code repositories, or manipulate the build pipeline to introduce malicious code. This vulnerability particularly affects continuous integration and deployment environments where Jenkins orchestrates automated workflows, making it a significant concern for organizations that rely heavily on automated software delivery processes. The lack of authentication verification means that any user with access to the Jenkins instance can exploit this vulnerability, regardless of their role or clearance level within the organization. This creates a substantial risk for supply chain attacks, where attackers might use Jenkins as a vector to compromise downstream systems or steal intellectual property.
Organizations should immediately implement mitigations including updating to the patched version of the Tuleap Git Branch Source Plugin, which addresses the missing permission check vulnerability. Network segmentation and access controls should be enforced to limit exposure of Jenkins instances to untrusted networks, while implementing proper authentication mechanisms such as LDAP or Active Directory integration to ensure that only authorized personnel can access Jenkins functionality. Additionally, organizations should conduct comprehensive audits of their Jenkins configurations to identify any other plugins that might exhibit similar authorization flaws. The ATT&CK framework categorizes this vulnerability under T1078 Valid Accounts and T1566 Phishing, as attackers might leverage this weakness to gain initial access and then use Jenkins as a platform for further compromise. Regular security assessments and vulnerability scanning should be implemented to detect similar authorization flaws in other Jenkins plugins or integrated systems, ensuring comprehensive protection against similar attack vectors.