GHSA-r5w3-pfq8-3r82

Jenkins SAML Plugin allows bypassing CSRF protection for any URL

Source: GitHub Advisory Database (reviewed) High CVE-2021-21678

Packages

Ecosystem	Package	Affected	Fixed in
Maven	org.jenkins-ci.plugins:saml	< 2.0.8	2.0.8

Details

As written in the advisory (Markdown source, shown as plain text).

An extension point in Jenkins allows selectively disabling cross-site request forgery (CSRF) protection for specific URLs. SAML Plugin implements this extension point for the URL that users are redirected to after login. In Jenkins SAML Plugin 2.0.7 and earlier this implementation is too permissive, allowing attackers to craft URLs that would bypass the CSRF protection of any target URL.\n\nThis vulnerability was originally introduced in Jenkins SAML Plugin 1.1.3. Jenkins SAML Plugin 2.0.8 restricts which URLs it disables cross-site request forgery (CSRF) protection for to the one URL that needs it.

References

External links from the advisory. They lead to third-party sites.

https://nvd.nist.gov/vuln/detail/CVE-2021-21678 advisory
https://github.com/jenkinsci/saml-plugin/commit/e063317ee7e1c64a096e0ac323c7155b786c8b9d web
https://github.com/jenkinsci/saml-plugin package
https://www.jenkins.io/security/advisory/2021-08-31/#SECURITY-2469 web
http://www.openwall.com/lists/oss-security/2021/08/31/1 web