The Jenkins OpenId Connect Authentication Plugin, versions 4.452.v2849b_d3945fa_ and earlier, except for 4.438.440.v3f5f201de5dc, contains a vulnerability that permits usernames to be treated as case-insensitive. This flaw is particularly exploitable on Jenkins instances configured with a case-sensitive OpenID Connect provider. Attackers can log in as any user by submitting a username that differs only by letter case, potentially leading to unauthorized administrative access.
With a CVSS score of 8.8, this vulnerability is classified as high severity. Organizations using affected versions of the plugin must prioritize remediation efforts to mitigate the associated risks effectively. The risk to organizations includes the potential for attackers to gain unauthorized access, which could lead to data breaches or compromise of the Jenkins environment.
Currently, there are no known exploits or public proof of concept (PoC) available for this vulnerability. However, the potential for exploitation remains high, emphasizing the urgency for organizations to apply the necessary patches immediately.
Organizations should address this vulnerability in their immediate patch cycle to prevent unauthorized access and maintain the integrity of their Jenkins environments.
Vulnerability Details
The vulnerability allows attackers to bypass authentication mechanisms by leveraging case sensitivity issues in usernames. The official description states that Jenkins OpenId Connect Authentication Plugin 4.452.v2849b_d3945fa_ and earlier, except for 4.438.440.v3f5f201de5dc, treats usernames as case-insensitive. This misconfiguration can lead to unauthorized access, including administrative privileges.
The CVSS score of 8.8 indicates a high severity threat, primarily due to the potential impacts on confidentiality, integrity, and availability. The affected product is the OpenId Connect Authentication Plugin for Jenkins, and the vulnerability was published on January 22, 2025.
Technical Analysis
The root cause of this vulnerability stems from the improper handling of username case sensitivity within the Jenkins OpenId Connect Authentication Plugin. Attackers can exploit this flaw by submitting a username that differs only in letter case, successfully bypassing authentication mechanisms.
The attack vector is network-based, with low complexity and low privileges required for successful exploitation. Importantly, no user interaction is necessary, making it easier for attackers to leverage this vulnerability. The impacts on confidentiality, integrity, and availability are all rated as high, signifying a serious risk to any affected Jenkins instance.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2025-24399 is significant, particularly for organizations that rely on Jenkins for critical operations. If exploited, attackers may gain administrative access, allowing them to manipulate configurations, access sensitive data, or disrupt services.
Given the high CVSS score of 8.8 and the absence of public exploits, organizations are advised to assess their exposure and prioritize remediation efforts. The urgency for organizations to address this vulnerability is underscored by the potential for widespread impact if left unmitigated.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerable versions of the Jenkins OpenId Connect Authentication Plugin include 4.452.v2849b_d3945fa_ and earlier, excluding version 4.438.440.v3f5f201de5dc. Organizations should ensure they are running patched versions to mitigate this vulnerability.
Mitigation & Remediation
To mitigate this vulnerability, organizations should upgrade to the latest version of the Jenkins OpenId Connect Authentication Plugin, ensuring they are not using any affected versions. For additional security, organizations can implement configuration hardening practices and perform regular security assessments.
Organizations may also consider utilizing penetration testing services to validate that no vulnerabilities remain post-remediation.
Detection Guidance
Organizations should monitor logs for unusual authentication attempts, especially those involving case variations in usernames. Additionally, behavioral anomalies associated with successful logins should be analyzed to detect potential exploitation.
AppSecure Threat Intelligence Insight
CVE-2025-24399 highlights the importance of maintaining strict username handling protocols within authentication mechanisms. Security teams must ensure that configurations do not inadvertently allow for case-insensitive username handling, particularly in environments utilizing OpenID Connect providers.
This vulnerability serves as a reminder of the critical nature of identity management within application security. Organizations should incorporate comprehensive security assessments into their routine practices to identify and remediate similar vulnerabilities effectively.
For further insights into application security practices, organizations can refer to vulnerability management programs and best practices in penetration testing methodologies to enhance their security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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