CVE-2022-20618 in Bitbucket Branch Source Plugin
Summary
by MITRE • 01/12/2022
A missing permission check in Jenkins Bitbucket Branch Source Plugin 737.vdf9dc06105be and earlier allows attackers with Overall/Read access to enumerate credentials IDs of credentials stored in Jenkins.
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Analysis
by VulDB Data Team • 01/15/2022
The vulnerability identified as CVE-2022-20618 resides within the Jenkins Bitbucket Branch Source Plugin, specifically affecting versions prior to 737.vdf9dc06105be. This issue represents a critical permission bypass flaw that undermines the fundamental security model of Jenkins credential management systems. The vulnerability manifests when attackers with merely Overall/Read access permissions can exploit a missing authorization check to discover credential identifiers stored within the Jenkins instance. This weakness directly violates the principle of least privilege and demonstrates a significant gap in the plugin's access control mechanisms.
The technical flaw stems from the absence of proper authorization validation within the credential enumeration functionality of the Bitbucket Branch Source Plugin. When legitimate users with read-only access attempt to interact with credential-related endpoints, the plugin fails to verify whether the requesting user possesses sufficient privileges to access credential identifiers. This missing permission check creates an information disclosure vulnerability where attackers can systematically enumerate available credentials without requiring elevated permissions. The flaw operates at the application layer and leverages the inherent trust model of Jenkins' credential management system to expose sensitive information through indirect means.
The operational impact of this vulnerability extends beyond simple information disclosure, creating potential downstream security risks for Jenkins environments. Attackers who can enumerate credential IDs gain valuable intelligence that could facilitate further exploitation attempts, including credential brute force attacks or social engineering campaigns. The exposure of credential identifiers provides threat actors with target-specific information that could lead to successful credential compromise if weak passwords or misconfigurations exist. This vulnerability particularly affects organizations that rely heavily on Jenkins for continuous integration and deployment workflows, where credential exposure could lead to unauthorized access to source code repositories, deployment systems, and production environments.
Organizations should immediately upgrade to Jenkins Bitbucket Branch Source Plugin version 737.vdf9dc06105be or later to remediate this vulnerability. In addition to patching, security teams should conduct comprehensive audits of credential usage within Jenkins environments, implementing additional monitoring for unauthorized credential enumeration attempts. The vulnerability aligns with CWE-284, which addresses improper access control, and maps to ATT&CK technique T1552.001 for credentials from password stores. Security controls should include implementing network segmentation, enforcing strict access controls, and deploying intrusion detection systems capable of identifying credential enumeration patterns. Regular security assessments of Jenkins plugins and configurations remain essential to prevent similar vulnerabilities from compromising continuous integration and deployment pipelines.