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                             CERT-Renater

                 Note d'Information No. 2021/VULN167
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DATE                : 18/03/2021

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running GitLab versions prior to 13.9.4,
                                        13.8.6, 13.7.9.

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https://about.gitlab.com/releases/2021/03/17/security-release-gitlab-13-9-4-released/
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 GitLab Critical Security Release: 13.9.4, 13.8.6, and 13.7.9

Learn more about GitLab Critical Security Release: 13.9.4, 13.8.6, and
13.7.9 for GitLab Community Edition (CE) and Enterprise Edition (EE).

Today we are releasing versions 13.9.4, 13.8.6, and 13.7.9 for GitLab
Community Edition (CE) and Enterprise Edition (EE).

These versions contain important security fixes, and we strongly
recommend that all GitLab installations be upgraded to one of these
versions immediately.

GitLab releases patches for vulnerabilities in dedicated security
releases. There are two types of security releases: a monthly, scheduled
security release, released a week after the feature release (which
deploys on the 22nd of each month), and ad-hoc security releases for
critical vulnerabilities. For more information, you can visit our
security FAQ. You can see all of our regular and security release blog
posts here. In addition, the issues detailing each vulnerability are
made public on our issue tracker 30 days after the release in which they
were patched.

We are dedicated to ensuring all aspects of GitLab that are exposed to
customers or that host customer data are held to the highest security
standards. As part of maintaining good security hygiene, it is highly
recommended that all customers upgrade to the latest security release
for their supported version. You can read more best practices in
securing your GitLab instance in our blog post.


Table of Fixes

Title 	Severity

Remote code execution via unsafe user-controlled markdown rendering
options 	critical

Remote code execution via unsafe user-controlled markdown rendering options


An issue has been discovered in GitLab CE/EE affecting all versions
starting from 13.2 allowing unauthorised authenticated users to execute
arbitrary code on the server. This is a critical severity issue
(CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H, 9.9). We have requested a
CVE ID and will update this blog post when it is assigned.

Thanks @vakzz for reporting this vulnerability through our HackerOne bug
bounty program.


Remediation

We strongly recommend that all installations running an affected version
above are upgraded to the latest version as soon as possible.


Updating

To update GitLab, see the Update page. To update Gitlab Runner, see the
Updating the Runner page.


Receive Security Release Notifications

To receive security release blog notifications delivered to your inbox,
visit our contact us page. To receive security release blog
notifications via RSS, subscribe to our RSS feed.

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+ CERT-RENATER       |    tel : 01-53-94-20-44          +
+ 23/25 Rue Daviel   |    fax : 01-53-94-20-41          +
+ 75013 Paris        |    email:cert@support.renater.fr +
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