Description:

CVE-2024-23898 is a critical vulnerability affecting Jenkins versions 2.217 through 2.441 and LTS versions 2.222.1 through 2.426.2. This vulnerability allows attackers to execute CLI commands on the Jenkins controller by exploiting a cross-site WebSocket hijacking (CSWSH) vulnerability. The SVRS score of 34 indicates a moderate risk, highlighting the need for prompt attention and remediation.

Key Insights:

1. Cross-Site WebSocket Hijacking (CSWSH) Vulnerability: CVE-2024-23898 enables attackers to hijack WebSocket connections, allowing them to execute arbitrary CLI commands on the Jenkins controller. This could lead to unauthorized access, privilege escalation, and potential compromise of the entire Jenkins instance.

2. Lack of Origin Validation: The root cause of this vulnerability is the absence of origin validation for requests made through the CLI WebSocket endpoint. This allows attackers to bypass security measures and establish malicious WebSocket connections, enabling them to execute CLI commands remotely.

3. Impact on Jenkins Users: This vulnerability affects a wide range of Jenkins users, including organizations and individuals relying on Jenkins for continuous integration and continuous delivery (CI/CD) processes. A successful exploit could disrupt build pipelines, compromise sensitive data, and lead to unauthorized access to Jenkins resources.

Mitigation Strategies:

1. Update Jenkins: The most effective mitigation strategy is to update Jenkins to the latest version (2.442 or later) or the latest LTS version (2.427 or later). This will patch the vulnerability and prevent attackers from exploiting it.

2. Disable CLI WebSocket Endpoint: If immediate updates are not feasible, organizations can disable the CLI WebSocket endpoint to mitigate the risk. This can be done by setting the JENKINS_CLI_WEB_SOCKET_ENABLED environment variable to false.

3. Implement Network Segmentation: Implementing network segmentation can help contain the impact of a potential exploit. By isolating Jenkins from other critical systems, organizations can limit the attacker's ability to move laterally within the network.

4. Monitor and Review Logs: Organizations should monitor Jenkins logs and security alerts for any suspicious activity. Regular review of logs can help detect and respond to potential exploitation attempts promptly.

Additional Information:

• Threat Actors/APT Groups: There is no information available regarding specific threat actors or APT groups actively exploiting this vulnerability.

• Exploit Status: Active exploits have not been published at this time.

• CISA Warnings: The Cybersecurity and Infrastructure Security Agency (CISA) has not issued a warning for this vulnerability.

• In the Wild: There is no evidence that this vulnerability is actively exploited by hackers.

If users have additional queries regarding this incident, they can use the 'Ask to Analyst' feature, contact SOCRadar directly, or open a support ticket for more information if necessary.