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             AUSCERT External Security Bulletin Redistribution

       GitLab Critical Security Release: 13.10.3, 13.9.6, and 13.8.8
                               15 April 2021


        AusCERT Security Bulletin Summary

Product:           GitLab Community Edition
                   GitLab Enterprise Edition
Publisher:         GitLab
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated      
                   Create Arbitrary Files          -- Remote with User Interaction
                   Reduced Security                -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-28965  

Reference:         ESB-2021.1147

Original Bulletin: 

Comment: A CVE has not yet been assigned for the critical remote code execution vulnerability.
         GitLab have requested a CVE ID for the vulnerability and the blog post will be updated
         once it has been assigned.

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GitLab Critical Security Release: 13.10.3, 13.9.6, and 13.8.8

Today we are releasing versions 13.10.3, 13.9.6, and 13.8.8 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 when uploading specially crafted  	critical
image files

Update Rexml                                            	Dependency update -

Remote code execution when uploading specially crafted image files

An issue has been discovered in GitLab CE/EE affecting all versions starting
from 11.9. GitLab was not properly validating image files that is passed to a
file parser which resulted in a remote command execution. This is a critical
severity issue (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


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

Update Rexml

The Rexml ruby gem was upgraded to version 3.2.5 in order to mitigate

Versions affected

Affects versions 7.12 and later.


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

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