[org.jenkins-ci.main:jenkins-core] Improper Input Validation in Jenkins

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier allows users with Agent/Configure permission to choose agent names that cause Jenkins to override the global config.xml file.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-21605
• https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2021
• https://github.com/advisories/GHSA-pxgq-gqr9-5gwx