Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.0284 Jenkins Security Advisory 2021-01-26 27 January 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Jenkins Core Publisher: Jenkins Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Access Confidential Data -- Existing Account Reduced Security -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-21615 CVE-2021-21602 Reference: ESB-2021.0191 Original Bulletin: https://www.jenkins.io/security/advisory/2021-01-26/ - --------------------------BEGIN INCLUDED TEXT-------------------- Jenkins Security Advisory 2021-01-26 This advisory announces vulnerabilities in the following Jenkins deliverables: o Jenkins (core) Descriptions Arbitrary file read vulnerability in workspace browsers SECURITY-2197 / CVE-2021-21615 Due to a time-of-check to time-of-use (TOCTOU) race condition, the file browser for workspaces, archived artifacts, and $JENKINS_HOME/userContent/ follows symbolic links to locations outside the directory being browsed in Jenkins 2.275 and LTS 2.263.2. This allows attackers with Job/Workspace permission and the ability to control workspace contents, e.g., with Job/Configure permission or the ability to change SCM contents, to create symbolic links that allow them to access files outside workspaces using the workspace browser. Note This issue is caused by an incorrectly applied fix for SECURITY-1452 / CVE-2021-21602 in the 2021-01-13 security advisory. Jenkins 2.276, LTS 2.263.3 no longer differentiates the check and the use of symlinks in workspace browsers. Severity o SECURITY-2197: Medium Affected Versions o Jenkins weekly up to and including 2.275 o Jenkins LTS up to and including 2.263.2 Fix o Jenkins weekly should be updated to version 2.276 o Jenkins LTS should be updated to version 2.263.3 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: o Wadeck Follonier, CloudBees, Inc. and Daniel Beck, CloudBees, Inc. for SECURITY-2197 - --------------------------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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYBCyauNLKJtyKPYoAQjPew/+N1dkUE/DA84Y3p+VGCZyjrt01UryfE0m JyTQeyZ1UiLLwY/ULZEBPSPWQ5lPst4zHo3isMcPX7pqw249aXE2JFfBhWiYoKmz z/Cr83RKmrqiEo29P2n1u41UEfwv5KnzKMf5tZcudoHEKZujq8zwfSjKU0nXrioK /65CGKcSFy4O3NPt5ZOC+FZikVvIyR1U637vs5O33LPDVBHEcJTYp1r0J+1JM8KX WytPtNMWvXKUYcnie05HkZ+pV7IPTSFjupFnJsVqc09/3oZS+emIpES4qyOFqAbE njpTaMSBhOUFp8Wwe6cFNaK/gE0U/W6AAGLXwv2wcFkezIzFQ1SLrdMxDLuf/Sun paNQpzoN18RFCvPUYsveUjxNzKuET9bTHbsq21rjtHtKRt3uPXppELbZXsUxjJ9x ns7FMaSXuvtWXtF+VK7pC3R27dhhh4FMXvNnLOTWklB/pPX0EPjdtOsxPpVpdodT lVDug/njisGv7U/L8xaHLU1UPHlbhiZ/+VLq1xItFZOerhem/Bk1biIOnXrxl02E 94s6ukBBVRr4qY/8EveS9FwIi9RipH4Ty3xeo4Jqg35TvlNOjXKsafLm+yU1enqe +1pOwyMBPx/r1i2bwBi+70YHvl+8dzLSbIkWbYWMp8bVYodH7cvC3CCj81fRcbGl 92c0eUBG7LU= =SMOT -----END PGP SIGNATURE-----