Description
A denial of service vulnerability exists in Jenkins 2.145 and earlier, LTS 2.138.1 and earlier in core/src/main/java/hudson/security/HudsonPrivateSecurityRealm.java that allows attackers without Overall/Read permission to access a specific URL on instances using the built-in Jenkins user database security realm that results in the creation of an ephemeral user record in memory.
Remediation
References
http://www.securityfocus.com/bid/106532
https://jenkins.io/security/advisory/2018-10-10/#SECURITY-1128
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