CVE-2022-36892 in rhnpush-plugin Plugin
Summary
by MITRE • 07/27/2022
Jenkins rhnpush-plugin Plugin 0.5.1 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-2022-36892 affects the Jenkins rhnpush-plugin version 0.5.1 and earlier, representing a critical authorization bypass issue that undermines the security model of the Jenkins continuous integration platform. This flaw exists within the plugin's form validation implementation where proper permission checks are absent, creating a scenario where unauthenticated or improperly authorized users can exploit the system's workspace inspection capabilities. The vulnerability specifically targets the plugin's handling of file pattern matching operations within the workspace context, allowing attackers to probe the filesystem structure without proper authorization.
The technical implementation of this vulnerability stems from a missing authorization check within the plugin's validation method that processes user-supplied file patterns. When an attacker with only Item/Read permission attempts to interact with the rhnpush plugin interface, they can manipulate the form validation process to test whether specific file patterns match files within the workspace directory. This occurs because the plugin fails to verify that the requesting user possesses the necessary Item/Workspace or Item/Configure permissions before executing the pattern matching logic against the actual workspace contents. The flaw essentially allows for a form of reconnaissance attack where attackers can determine the existence of specific files or directories without proper authorization, creating a pathway for further exploitation.
From an operational impact perspective, this vulnerability enables attackers to conduct systematic reconnaissance of Jenkins workspace contents, potentially uncovering sensitive files, configuration data, or source code artifacts that should remain protected. The ability to validate file patterns against workspace contents provides attackers with valuable information about the system's file structure and potentially reveals the presence of credentials, build artifacts, or other sensitive materials stored within the workspace. This reconnaissance capability can significantly aid attackers in planning more sophisticated attacks, as they can identify specific targets within the workspace that may contain exploitable information or components. The vulnerability particularly affects environments where Jenkins serves as a central build and deployment system, as workspace contents often contain production-related artifacts and sensitive configuration files.
The security implications of this vulnerability align with CWE-284, which addresses improper access control issues in software systems. This classification specifically covers scenarios where applications fail to properly enforce authorization checks, allowing unauthorized users to access resources or perform operations they should not be permitted to execute. The ATT&CK framework categorizes this vulnerability under T1083 - File and Directory Discovery, as it enables attackers to systematically enumerate workspace contents through the plugin's validation interface. Organizations utilizing Jenkins with the affected rhnpush plugin version face significant risk, as this vulnerability can be exploited without requiring elevated privileges or administrative access, making it particularly dangerous in multi-user environments where access control is paramount.
Mitigation strategies for CVE-2022-36892 should prioritize immediate plugin updates to version 0.5.2 or later, which contain the necessary authorization checks to prevent unauthorized workspace enumeration. System administrators should also implement additional security controls such as restricting access to the rhnpush plugin interface, ensuring that only authorized users possess the required Item/Configure permissions, and conducting regular audits of plugin installations and configurations. Organizations should consider implementing network segmentation and monitoring solutions to detect anomalous pattern matching activities within Jenkins environments, as these operations may indicate exploitation attempts. Additionally, comprehensive security training for Jenkins administrators and developers should emphasize the importance of proper permission modeling and the potential consequences of missing authorization checks in plugin development.