Jenkins Nexus Platform Plugin 3.18.0-03 and earlier does not perform permission checks in methods implementing form validation.

This allows attackers with Overall/Read permission to send an HTTP request to an attacker-specified URL and parse the response as XML.

Additionally, the plugin does not configure its XML parser to prevent XML external entity (XXE) attacks, so attackers can have Jenkins parse a crafted XML response that uses external entities for extraction of secrets from the Jenkins controller or server-side request forgery.

Additionally, these form validation methods do not require POST requests, resulting in a cross-site request forgery (CSRF) vulnerability.

Nexus Platform Plugin 3.18.1-01 configures its XML parser to prevent XML external entity (XXE) attacks.

Additionally, POST requests and Overall/Administer permission are required for the affected HTTP endpoints.

References

• https://nvd.nist.gov/vuln/detail/CVE-2023-50766
• https://www.jenkins.io/security/advisory/2023-12-13/#SECURITY-3204
• http://www.openwall.com/lists/oss-security/2023/12/13/4
• jenkinsci/nexus-platform-plugin#291
• jenkinsci/nexus-platform-plugin@1d5e1e9