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                               CERT-Renater

                    Note d'Information No. 2023/VULN079

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DATE                : 15/02/2023

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running GitLab versions prior to 15.8.2, 
                                   15.7.7, 15.6.8.

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https://about.gitlab.com/releases/2023/02/14/critical-security-release-gitlab-15-8-2-released/
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  GitLab Critical Security Release: 15.8.2, 15.7.7 and 15.6.8

Learn more about GitLab Critical Security Release: 15.8.2, 15.7.7 and 
15.6.8 for GitLab Community Edition (CE) and Enterprise Edition (EE).

Today we are releasing versions 15.8.2, 15.7.7, and 15.6.8 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.com and GitLab Dedicated are already 
running the patched version.

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.
Recommended Action

We strongly recommend that all installations running a version affected 
by the issues described below are upgraded to the latest version as soon 
as possible.

When no specific deployment type (omnibus, source code, helm chart, 
etc.) of a product is mentioned, this means all types are affected.
Table of Fixes
Title 	Severity
Security issues in Git 	Critical
Security issues in Git

This release addresses the security issues CVE-2023-23946 and 
CVE-2023-22490 in Git.

These vulnerabilities affect all previous versions of GitLab.

The details of these vulnerabilities are as follows:
CVE-2023-23946

A user can feed a specially crafted input to git apply to overwrite a 
path outside the working tree.

This can be used to execute arbitrary commands in GitLab installations 
within GitLab's Gitaly environment.

Credit for finding CVE-2023-23946 goes to Joern Schneeweisz of GitLab.
CVE-2023-22490

Using a specially-crafted repository, Git can be tricked into using its 
local clone optimization even when using a non-local transport. Though 
Git will abort local clones whose source $GIT_DIR/objects directory 
contains symbolic links (c.f., CVE-2022-39253), the objects directory 
itself may still be a symbolic link.

These two may be combined to include arbitrary files based on known 
paths on the victim's filesystem within the malicious repository's 
working copy, allowing for data exfiltration in a similar manner as 
CVE-2022-39253.

Credit for finding CVE-2023-22490 goes to yvvdwf.
Update Python

Python has been updated to version 3.9.16 in order to mitigate security 
issues.
Versions affected

Affects all GitLab Omnibus versions from 14.1 to 15.6.7, all 15.7 
versions before 15.7.7, and all 15.8 versions before 15.8.2.
Non-security patches

This security release also includes the following non-security patches.

Into 15.8.2:

     Fix false positives for approved by insufficient users violation
     gitaly: Remove readiness check

Into 15.7.7:

     GitLab Version Check - Add feature flag
     gitaly: Remove readiness check

Updating

To update GitLab, see the Update page.
Receive Security Release Notifications

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

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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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