[org.jenkins-ci.plugins:swarm] CSRF vulnerability in Jenkins Swarm Plugin

Swarm Plugin adds API endpoints to add or remove agent labels. In Swarm Plugin 3.20 and earlier these only require a global Swarm secret to use, and no regular permission check is performed. This allows users with Agent/Create permission to add or remove labels of any agent.

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

Swarm Plugin 3.21 requires POST requests and Agent/Configure permission for the affected agent to these endpoints. It no longer uses the global Swarm secret for these API endpoints.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-2192
• https://jenkins.io/security/advisory/2020-06-03/#SECURITY-1200
• http://www.openwall.com/lists/oss-security/2020/06/03/3
• https://github.com/advisories/GHSA-c264-8834-ppj2