CVE-2023-41934 - Jenkins Pipeline Maven Integration Plugin 133.v18e473854496 Security Vulnerability Explained

A security vulnerability (CVE-2023-41934) has been identified in the Jenkins Pipeline Maven Integration Plugin 133.v18e473854496 and earlier versions. This vulnerability could allow usernames of credentials specified in custom Maven settings to be exposed in Pipeline build logs even when "Treat username as secret" is enabled.

This post aims to explore the details of this vulnerability, explain the potential impacts it could have on vulnerable systems, and provide guidance on how to mitigate the issue.

Vulnerability Details

The vulnerability, tracked as CVE-2023-41934, exists in the Jenkins Pipeline Maven Integration Plugin 133.v18e473854496 and earlier versions. It occurs because the plugin does not properly mask (i.e., replace with asterisks) the usernames of credentials specified in custom Maven settings in Pipeline build logs when the "Treat username as secret" option is selected. As a result, sensitive information (usernames) can be exposed in logs, which may allow unauthorized users to gain access to the system.

Affected Versions

Jenkins Pipeline Maven Integration Plugin versions 133.v18e473854496 and earlier.

Exploit Details

To exploit this vulnerability, an attacker would first need to create a Jenkins Pipeline build that uses the Maven Integration Plugin with a custom Maven settings file. The attacker can create a pipeline and specify a credential with a username in the custom Maven settings file like this:

settings.xml

<servers>
  <server>
    <id>my-private-repo</id>
    <username>{USERNAME}</username>
    <password>{PASSWORD}</password>
  </server>
</servers>

Next, the attacker would enable the "Treat username as secret" option in the 'withMaven' step, like this:

Jenkinsfile

node {
  checkout scm

  withMaven(mavenSettingsConfig: 'my-settings', options: [usernamePasswordFilter()], maven: 'my-maven') {
    sh "mvn clean install"
  }
}

Despite having the "Treat username as secret" option enabled, the build logs will still show the username in clear text, exposing sensitive information.

Mitigation Steps

To mitigate this vulnerability, users should update the Jenkins Pipeline Maven Integration Plugin to a version after 133.v18e473854496, which properly masks the usernames of credentials in custom Maven settings.

References

- CVE-2023-41934 Jenkins Advisory
- Pipeline Maven Integration Plugin Changelog

Conclusion

In summary, CVE-2023-41934 is a security vulnerability in the Jenkins Pipeline Maven Integration Plugin 133.v18e473854496 and earlier versions. This vulnerability allows usernames to be exposed in Pipeline build logs even when the "Treat username as secret" option is enabled. To protect their systems from potential attacks, users should update their Jenkins Pipeline Maven Integration Plugin to a newer version.

Timeline

Published on: 09/06/2023 13:15:10 UTC
Last modified on: 09/12/2023 13:24:46 UTC