CVE-2020-2313 in Azure Key Vault Plugin
Summary
by MITRE • 11/04/2020
A missing permission check in Jenkins Azure Key Vault Plugin 2.0 and earlier allows attackers with Overall/Read permission to enumerate credentials IDs of credentials stored in Jenkins.
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Analysis
by VulDB Data Team • 12/02/2020
The vulnerability identified as CVE-2020-2313 represents a critical authorization flaw within the Jenkins Azure Key Vault Plugin version 2.0 and earlier. This issue stems from a missing permission check that allows unauthorized users to bypass normal access controls and discover credential identifiers stored within the Jenkins system. The vulnerability specifically affects environments where the Azure Key Vault plugin is installed and configured, creating a potential information disclosure risk that could significantly impact security posture. The flaw exists in the plugin's handling of credential enumeration requests, where proper access validation is not enforced for users with only Overall/Read permission levels.
The technical implementation of this vulnerability occurs at the permission validation layer within the Azure Key Vault plugin code. When users with minimal privileges attempt to access credential information through the plugin's API endpoints, the system fails to properly verify whether the requesting user has adequate authorization to view credential IDs. This missing validation allows attackers to enumerate available credentials even though they lack explicit permission to access the actual credential values. The flaw operates at the application logic level and can be exploited through standard API calls or web interface interactions that trigger credential listing functionality. This type of vulnerability falls under the CWE-284 access control weakness category, specifically addressing insufficient authorization checks within the authentication framework.
The operational impact of this vulnerability extends beyond simple information disclosure to create potential attack vectors for more sophisticated exploitation attempts. An attacker who can enumerate credential IDs can then focus subsequent attacks on specific targets, potentially bypassing other security controls that might protect against broad credential access attempts. The enumeration capability allows for targeted credential harvesting, where attackers can identify which credentials are available and then attempt to exploit other vulnerabilities or weaknesses in the credential management system. This vulnerability directly impacts the principle of least privilege by enabling unauthorized users to discover sensitive information about the system's credential landscape, which could lead to privilege escalation or credential compromise through additional attack vectors.
Organizations utilizing Jenkins with Azure Key Vault plugin versions 2.0 or earlier face significant risk from this vulnerability, particularly in environments where multiple users have Overall/Read permissions. The attack surface is widened because the vulnerability does not require high-privilege accounts to exploit, making it accessible to users with relatively low access levels. This creates a scenario where internal users or attackers who have gained minimal access to Jenkins can escalate their reconnaissance efforts and potentially compromise the entire credential management infrastructure. The vulnerability also impacts compliance requirements for information security frameworks that mandate strict access controls and audit logging of credential access attempts. Security teams should consider this vulnerability as part of their broader risk assessment for continuous integration and deployment environments that rely heavily on external credential management systems.
The recommended mitigation strategy involves immediate upgrade to Jenkins Azure Key Vault Plugin version 2.1 or later, which includes the necessary permission checks to prevent unauthorized credential enumeration. Organizations should also implement additional monitoring controls to detect anomalous credential access patterns and establish more robust access control policies. Security administrators should review existing user permissions and ensure that users with Overall/Read access do not inadvertently gain access to credential enumeration functionality. The fix addresses the underlying CWE-284 issue by implementing proper authorization checks and ensuring that credential ID enumeration requests are properly validated against user permissions before execution. Regular security assessments and penetration testing should be conducted to identify similar permission bypass vulnerabilities within the Jenkins ecosystem and related plugins.