Jenkins shows various technical details about the current user on the /whoAmI
page. In a previous fix, the Cookie
header value containing the HTTP session ID was redacted. However, user metadata shown on this page could also include the HTTP session ID in Jenkins 2.218 and earlier, LTS 2.204.1 and earlier.
This allows attackers able to exploit a cross-site scripting vulnerability to obtain the HTTP session ID value from this page.
Jenkins 2.219, LTS 2.204.2 no longer prints out the affected user metadata that might contain the HTTP session ID.
Additionally, we also redact values of further authentication-related HTTP headers in addition to Cookie
on this page as a hardening.
www.openwall.com/lists/oss-security/2020/01/29/1
access.redhat.com/errata/RHBA-2020:0402
access.redhat.com/errata/RHBA-2020:0675
access.redhat.com/errata/RHSA-2020:0681
access.redhat.com/errata/RHSA-2020:0683
github.com/jenkinsci/jenkins
github.com/jenkinsci/jenkins/commit/77f36f37f5e3cabd0e4ece16d46d7943454ed15b
jenkins.io/security/advisory/2020-01-29/#SECURITY-1695
nvd.nist.gov/vuln/detail/CVE-2020-2103