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             AUSCERT External Security Bulletin Redistribution

                   Jenkins Security Advisory 2019-01-16
                              17 January 2019


        AusCERT Security Bulletin Summary

Product:           Jenkins (core)
Publisher:         Jenkins project
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Increased Privileges -- Existing Account
                   Unauthorised Access  -- Existing Account
Resolution:        Patch/Upgrade

Original Bulletin: 

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Jenkins Security Advisory 2019-01-16

This advisory announces vulnerabilities in the following Jenkins deliverables:

    Jenkins (core)


Administrators could persist access to Jenkins using crafted 'Remember me' 

SECURITY-868 / CVE pending

Users with the Overall/RunScripts permission (typically administrators) were 
able to use the Jenkins script console to craft a 'Remember me' cookie that 
would never expire.

This allowed attackers access to a Jenkins instance while the corresponding 
user in the configured security realm exists, for example to persist access 
after another successful attack.

Jenkins now encodes a per-user seed value in 'Remember me' cookies that is 
invalidated when the user password in the Jenkins user database is changed, 
the user record in Jenkins is deleted, or when all sessions for a given user
are terminated through a new feature on the user’s configuration page.

Deleting a user in an external security realm did not invalidate their session
or 'Remember me' cookie

SECURITY-901 / CVE pending

When using an external security realm such as LDAP or Active Directory, 
deleting a user from the security realm does not result in the user losing 
access to Jenkins.

While deleting the user record from Jenkins did invalidate the 'Remember me' 
cookie, there was no way to invalidate active sessions besides restarting 
Jenkins or terminating sessions through other means, such as Monitoring Plugin.

Jenkins now encodes a per-user seed value in sessions, 'Remember me' cookies, 
and cached authentications of the remoting-based CLI, that can manually be 
reset by a user themselves, or an administrator, on the user’s configuration
page. Doing so will invalidate all current sessions, 'Remember me' cookies, 
and cached CLI authentications, requiring credentials to be entered again to 
authenticate. Deleting a user record in Jenkins will now also invalidate 
existing sessions, as the current seed value is deleted as well.


    SECURITY-868: high
    SECURITY-901: medium

Affected Versions

    Jenkins weekly up to and including 2.159
    Jenkins LTS up to and including 2.150.1


    Jenkins weekly should be updated to version 2.160
    Jenkins LTS should be updated to version 2.150.2

These versions include fixes to the vulnerabilities described above. All 
prior versions are considered to be affected by these vulnerabilities 
unless otherwise indicated.


The Jenkins project would like to thank the reporters for discovering and 
reporting these vulnerabilities:

    Apple Information Security for SECURITY-868
    Nimrod Stoler of CyberArk Labs for SECURITY-901

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