CVE-2023-24445 in OpenID Plugin
Summary
by MITRE • 01/26/2023
Jenkins OpenID Plugin 2.4 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins.
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Analysis
by VulDB Data Team • 07/04/2025
The vulnerability identified as CVE-2023-24445 affects the Jenkins OpenID Plugin version 2.4 and earlier, representing a critical authorization bypass flaw that undermines the security of authentication mechanisms within Jenkins environments. This issue stems from improper validation of redirect URLs following user authentication, creating a pathway for malicious actors to exploit the authentication flow. The vulnerability specifically targets the plugin's failure to properly verify that redirect destinations are legitimate and authorized to receive authentication responses, potentially allowing attackers to manipulate the post-login redirection process.
The technical flaw manifests in the plugin's insufficient input validation and sanitization of redirect URLs, which violates fundamental security principles outlined in CWE-601. When users authenticate through OpenID, the system should validate that the intended redirect URL is within the trusted domain or explicitly authorized by the system configuration. However, the vulnerable plugin fails to perform this crucial validation, enabling attackers to craft malicious redirect URLs that could lead to open redirect vulnerabilities. This weakness allows unauthorized redirection to external domains, potentially facilitating phishing attacks or credential theft scenarios where users are redirected to malicious sites after successful authentication.
The operational impact of this vulnerability extends beyond simple redirection manipulation, as it can be leveraged to bypass authentication controls and potentially gain unauthorized access to Jenkins resources. Attackers can exploit this flaw by crafting specially formatted URLs that appear legitimate to the vulnerable plugin but actually redirect users to malicious destinations. This creates a significant risk for organizations relying on Jenkins for continuous integration and deployment processes, where unauthorized access could lead to code injection, data theft, or complete system compromise. The vulnerability is particularly dangerous in enterprise environments where Jenkins serves as a central automation platform, as it could enable attackers to escalate privileges and access sensitive build artifacts, configuration files, and deployment credentials.
Organizations should immediately upgrade to Jenkins OpenID Plugin version 2.5 or later, which addresses this vulnerability through proper URL validation mechanisms. Additionally, administrators should implement network-level restrictions and firewall rules to limit access to Jenkins instances, particularly when exposed to untrusted networks. The mitigation strategy should include reviewing and validating all authentication configurations, implementing proper input sanitization for redirect parameters, and monitoring access logs for suspicious redirection patterns. This vulnerability aligns with ATT&CK technique T1566, specifically focusing on social engineering through malicious redirects, and demonstrates the importance of proper authentication flow validation in security architectures. Regular security assessments and vulnerability scanning should be implemented to identify similar issues in other authentication plugins or components within the Jenkins ecosystem, ensuring comprehensive protection against authorization bypass attacks.