A critical vulnerability in Jenkins, tracked as CVE-2024-23897, continues to be actively exploited by threat actors targeting vulnerable Continuous Integration and Continuous Deployment (CI/CD) environments. The flaw allows attackers to read arbitrary files from the Jenkins controller and, under specific conditions, escalate the attack to achieve remote code execution (RCE). Security researchers and government agencies have reported active exploitation attempts, making immediate remediation essential for organizations using Jenkins. CVE-2024-23897 is an arbitrary file read vulnerability affecting Jenkins’ built-in Command Line Interface (CLI). The issue originates from the use of the args4j library, which improperly processes command arguments beginning with the character. By exploiting this behavior, attackers can access files stored on the Jenkins controller without proper authorization. Although the vulnerability initially appears limited to file disclosure, attackers can leverage exposed cryptographic keys, secrets, and configuration data to perform further attacks. Researchers demonstrated that sensitive information obtained through file reads can facilitate multiple exploitation paths, including remote code execution, privilege escalation, secret decryption, cross-site scripting abuse, and Jenkins item manipulation. Public proof-of-concept exploits are widely available, significantly lowering the barrier to exploitation. Threat intelligence reports indicate that ransomware operators and other threat actors have incorporated the vulnerability into their attack campaigns. Unpatched Jenkins instances exposed to the internet remain particularly vulnerable.
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