CVE-2015-5323 in Jenkins
Summary
by MITRE
CloudBees Jenkins before 1.638 and LTS before 1.625.2 do not properly restrict access to API tokens which might allow remote administrators to gain privileges and run scripts by using an API token of another user.
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Analysis
by VulDB Data Team • 06/27/2022
The vulnerability identified as CVE-2015-5323 represents a critical access control flaw within CloudBees Jenkins continuous integration platform affecting versions prior to 1.638 and LTS versions prior to 1.625.2. This issue stems from inadequate validation mechanisms that govern how API tokens are handled within the Jenkins ecosystem, creating a pathway for unauthorized privilege escalation. The flaw specifically targets the authentication and authorization processes that govern user access to Jenkins administrative functions through API endpoints.
The technical implementation of this vulnerability allows remote attackers with administrative privileges to exploit a weakness in the token management system. When a user generates an API token within Jenkins, the system should enforce strict access controls to ensure that tokens can only be used by their legitimate owners. However, the vulnerability enables a malicious administrator to extract and utilize another user's API token, effectively bypassing the intended user isolation mechanisms. This flaw operates at the application layer and specifically impacts the Jenkins core security model that governs how authentication tokens are validated and processed.
The operational impact of CVE-2015-5323 extends beyond simple privilege escalation to encompass potential code execution and system compromise. An attacker who successfully exploits this vulnerability can execute arbitrary scripts on the Jenkins server with the privileges of the targeted user, potentially leading to complete system compromise. The vulnerability particularly affects environments where multiple administrators exist, as it allows one administrator to impersonate another and gain elevated access rights. This creates a significant risk for organizations relying on Jenkins for critical build and deployment processes, as it undermines the fundamental security assumptions of user isolation and access control.
This vulnerability aligns with CWE-285, which addresses improper authorization within software systems, and maps to ATT&CK technique T1078 for valid accounts and T1548 for abuse of privileges. The flaw represents a classic case of insufficient access control validation that allows for privilege escalation through token manipulation. Organizations using Jenkins should immediately implement the recommended patches to version 1.638 or LTS 1.625.2, which address the token validation logic and enforce proper access controls. Additional mitigations include implementing network segmentation, limiting administrative access, and monitoring for suspicious API token usage patterns. The vulnerability underscores the critical importance of proper authentication token management in CI/CD environments where automated systems execute sensitive operations.