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AUSCERT External Security Bulletin Redistribution
ESB-2019.0154
Jenkins Security Advisory 2019-01-16
17 January 2019
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AusCERT Security Bulletin Summary
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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:
https://jenkins.io/security/advisory/2019-01-16/
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Jenkins Security Advisory 2019-01-16
This advisory announces vulnerabilities in the following Jenkins deliverables:
Jenkins (core)
Descriptions
Administrators could persist access to Jenkins using crafted 'Remember me'
cookie
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.
Severity
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
Fix
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.
Credit
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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The University of Queensland
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