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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.3200 Jenkins patches race conditions during setup 14 December 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Jenkins Publisher: Jenkins Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Cross-site Request Forgery -- Remote with User Interaction Unauthorised Access -- Remote/Unauthenticated Resolution: Patch/Upgrade Original Bulletin: https://jenkins.io/security/advisory/2017-12-14/ Comment: Please note that the bugs are triggered during setup. The vendor advises: "Affected instances need to be configured to restrict access." - --------------------------BEGIN INCLUDED TEXT-------------------- Jenkins Security Advisory 2017-12-14 This advisory announces two vulnerabilities in Jenkins. Description Random failures to initialize the setup wizard on startup SECURITY-667 A race condition during Jenkins startup could result in the wrong order of execution of commands during initialization. On Jenkins 2.81 and newer, including LTS 2.89.1, this could in rare cases (we estimate less than 20% of new instances) result in failure to initialize the setup wizard on the first startup. This resulted in the following security settings not being set to their usual strict default: No security realm was defined, and no admin user was created whose password was written to the Jenkins log or the initialAdminPassword file. The authorization strategy remained Anyone can do anything rather than Logged-in users can do anything. TCP port for JNLP agents, usually disabled by default, was open, unless a Java system property controlling it was set. CLI over Remoting was enabled. CSRF Protection was disabled. Agent → Master Access Control was disabled. Affected instances need to be configured to restrict access. CSRF protection delayed after startup SECURITY-667 A race condition during Jenkins startup could result in the wrong order of execution of commands during initialization. There’s a very short window of time after startup during which Jenkins may no longer show the "Please wait while Jenkins is getting ready to work" message, but Cross-Site Request Forgery (CSRF) protection may not yet be effective. As of publication of this advisory, we’ve been unable to confirm this can actually be exploited, but generally recommend that users upgrade to the fixed versions below. Severity SECURITY-667: high Affected versions Random failures to initialize the setup wizard on startup: Jenkins 2.81 through 2.94 (inclusive) Jenkins LTS 2.89.1 CSRF protection delayed after startup: Jenkins up to and including 2.94 Jenkins LTS up to and including 2.89.1 Fix Jenkins main line users should update to 2.95 Jenkins LTS users should update to 2.89.2 Users who originally installed Jenkins 2.81 through 2.94, or LTS 2.89.1, should review all the options of the Configure Global Security screen. These versions include fixes to all the vulnerabilities described above. All prior versions are affected by these vulnerabilities unless otherwise indicated. Credit The Jenkins project would like to thank the reporters for discovering and reporting these vulnerabilities: Daniel Beck, CloudBees, Inc. for SECURITY-667 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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