CVE-2017-1000094 in Jenkins
Summary
by MITRE
Docker Commons Plugin provides a list of applicable credential IDs to allow users configuring a job to select the one they'd like to use to authenticate with a Docker Registry. This functionality did not check permissions, allowing any user with Overall/Read permission to get a list of valid credentials IDs. Those could be used as part of an attack to capture the credentials using another vulnerability.
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Analysis
by VulDB Data Team • 11/22/2019
The vulnerability identified as CVE-2017-1000094 affects the Docker Commons Plugin within Jenkins continuous integration and delivery platform. This issue represents a critical information disclosure weakness that undermines the security controls designed to protect sensitive authentication credentials. The plugin's primary function is to facilitate Docker registry authentication by providing users with a list of available credential IDs when configuring jobs. However, the implementation contains a fundamental flaw in its access control mechanism that allows unauthorized users to enumerate valid credential identifiers without proper authorization.
The technical flaw stems from the absence of permission validation within the credential listing functionality. When users with only Overall/Read permission attempt to access the Docker registry credential selection interface, the system fails to verify whether they possess sufficient privileges to view the credential information. This permission bypass creates a reconnaissance opportunity for attackers who can systematically discover valid credential IDs that would otherwise be restricted to authorized personnel. The vulnerability operates at the application layer and directly violates the principle of least privilege by exposing credential metadata to unauthorized individuals.
The operational impact of this vulnerability extends beyond simple information disclosure, creating a significant attack vector that can be leveraged in conjunction with other vulnerabilities to compromise Docker registry authentication. An attacker who discovers valid credential IDs can then attempt to exploit additional weaknesses in the system to capture the actual credential values, potentially gaining unauthorized access to Docker registries and the containers hosted within them. This vulnerability particularly affects environments where Jenkins serves as a central automation platform for containerized applications, making it a prime target for attackers seeking to escalate their access within container orchestration environments.
The security implications align with CWE-200, which addresses improper exposure of sensitive information, and demonstrates characteristics consistent with ATT&CK technique T1552.001 for credentials in files and T1552.006 for credentials in registry. Organizations running vulnerable Jenkins instances face the risk of credential theft, unauthorized container registry access, and potential lateral movement within their infrastructure. The vulnerability is particularly concerning because it requires minimal privileges to exploit and can be automated to systematically enumerate valid credentials.
Mitigation strategies should focus on immediate plugin updates to versions that address the permission checking flaw, implementation of additional access controls for the Docker Commons Plugin, and regular security assessments of Jenkins configurations. Organizations should also consider implementing network segmentation, monitoring for unauthorized credential enumeration attempts, and regular credential rotation practices. The vulnerability highlights the importance of proper access control implementation in plugin architectures and serves as a reminder of the critical need to validate permissions at all interaction points within security-sensitive applications.