Listen to this Post
How the mentioned CVE works:
The vulnerability exists in the form validation method of the Jenkins Publish to Bitbucket Plugin. This method lacks any permission check. An attacker with only Overall/Read permission, the lowest level access, can send a crafted HTTP request to the endpoint responsible for validating form fields. By manipulating the request parameters, the attacker can force the plugin to interact with the Jenkins credentials store. This interaction reveals the unique identifiers (IDs) of all stored credentials, such as those for Bitbucket or other systems. The credential IDs themselves are exposed in the server’s response. While this does not directly leak the secret values, it provides a critical reconnaissance tool. Attackers can use this list of IDs to target specific credentials in subsequent attacks, potentially using another vulnerability to finally capture the secret content.
Platform: Jenkins Plugin
Version: <= 0.4
Vulnerability: Missing Authorization
Severity: Moderate
date: 2024-10-29
Prediction: 2024-11-19
What Undercode Say:
`curl -X POST http://jenkins-host/descriptorByName/com.cloudbees.jenkins.plugins.BitbucketPushRepositoryPublisher/checkApiKey –form “apiKey=credential-id”`
`curl -X POST http://jenkins-host/descriptorByName/com.cloudbees.jenkins.plugins.BitbucketPushRepositoryPublisher/checkRepositoryName –form “repositoryName=test” –form “credentialsId=credential-id”`
`grep -r “credentialsId” /var/jenkins_home/jobs//config.xml`
How Exploit:
Send POST request to form validation endpoints without authentication. Enumerate valid credential IDs from error messages or response times.
Protection from this CVE:
Uninstall the plugin. Apply network access controls. Await vendor patch.
Impact:
Credential ID enumeration. Information disclosure facilitating further attacks.
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
