CVE-2022-36893 in rpmsign-plugin
Summary
by MITRE • 07/27/2022
Jenkins rpmsign-plugin Plugin 0.5.0 and earlier does not perform a permission check in a method implementing form validation, allowing attackers with Item/Read permission but without Item/Workspace or Item/Configure permission to check whether attacker-specified file patterns match workspace contents.
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Analysis
by VulDB Data Team • 08/28/2022
The vulnerability identified as CVE-2022-36893 affects the Jenkins rpmsign-plugin version 0.5.0 and earlier, representing a critical authorization bypass flaw that undermines the security model of the Jenkins continuous integration platform. This issue stems from insufficient permission validation within a method responsible for form validation, creating a scenario where unauthorized users can potentially enumerate workspace contents through file pattern matching operations.
The technical flaw manifests in the plugin's failure to enforce proper access controls during form validation processes. Specifically, when an attacker with only Item/Read permission attempts to validate file patterns, the system does not verify whether the user possesses the necessary Item/Workspace or Item/Configure permissions required to access workspace contents. This oversight allows malicious actors to perform reconnaissance activities by testing various file patterns against the workspace, effectively enabling them to discover the presence of specific files or directories without proper authorization.
From an operational impact perspective, this vulnerability exposes Jenkins environments to information disclosure risks that can significantly compromise security posture. Attackers can leverage this flaw to map workspace structures, identify sensitive files, and potentially discover credentials, configuration files, or other artifacts stored within the build environment. The vulnerability particularly affects organizations that rely on Jenkins for automated builds and deployments, as it could enable adversaries to gather intelligence for more sophisticated attacks targeting the build infrastructure or the applications being built.
The security implications extend beyond simple enumeration, as this flaw aligns with CWE-284 Access Control Issues, specifically representing inadequate permission checking in a method that should enforce proper access controls. From an ATT&CK framework perspective, this vulnerability supports the reconnaissance phase of attack chains, enabling threat actors to gather information about system structure and contents before attempting more targeted exploitation. The flaw also relates to technique T1083 File and Directory Discovery, as attackers can systematically identify files within the workspace through pattern matching operations.
Organizations should immediately update their Jenkins installations to version 0.5.1 or later of the rpmsign-plugin to remediate this vulnerability. Additionally, administrators should review and tighten permission policies within their Jenkins environments, ensuring that users with Item/Read permissions are properly restricted from workspace enumeration activities. Security monitoring should be enhanced to detect anomalous pattern matching behaviors in form validation processes, and regular security audits should verify that all plugins maintain proper access control mechanisms. The incident highlights the critical importance of implementing defense-in-depth strategies where multiple layers of security controls work together to prevent privilege escalation and unauthorized information disclosure.