Description
A missing permission check in Jenkins PAM Authentication Plugin 1.5 and earlier, except 1.4.1 in PamSecurityRealm.DescriptorImpl#doTest allowed users with Overall/Read permission to obtain limited information about the file /etc/shadow and the user Jenkins is running as.
Remediation
References
http://www.openwall.com/lists/oss-security/2019/05/21/1
https://jenkins.io/security/advisory/2019-05-21/#SECURITY-1316
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