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AUSCERT External Security Bulletin Redistribution
ESB-2020.4316
GitLab: Multiple vulnerabilities
8 December 2020
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AusCERT Security Bulletin Summary
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Product: GitLab Community Edition (CE)
GitLab Enterprise Edition (EE)
Publisher: GitLab
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Virtualisation
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Denial of Service -- Existing Account
Access Confidential Data -- Remote/Unauthenticated
Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-26411 CVE-2020-26409 CVE-2020-26408
CVE-2020-26407 CVE-2020-13357
Original Bulletin:
https://about.gitlab.com/releases/2020/12/07/security-release-gitlab-13-6-2-released/
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Dec 7, 2020 - Andrew Kelly
GitLab Security Release: 13.6.2, 13.5.5, and 13.4.7
Learn more about GitLab Security Release: 13.6.2, 13.5.5, and 13.4.7 for GitLab
Community Edition (CE) and Enterprise Edition (EE)
Today we are releasing versions 13.6.2, 13.5.5, and 13.4.7 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. 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.
XSS in Zoom Meeting URL
A XSS vulnerability exists in Gitlab CE/EE starting with 12.4 that allows an
attacker to perform cross-site scripting to other users via importing a
malicious project. This is a medium severity issue (CVSS:3.1/AV:N/AC:H/PR:L/
UI:R/S:C/C:L/I:L/A:L, 5.5). It is now mitigated in the latest release and is
assigned CVE-2020-26407.
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.
Limited Information Disclosure in Private Profile
A limited information disclosure vulnerability exists in Gitlab CE/EE starting
with 12.2 that allows an attacker to view limited information in user's private
profile. This is a medium severity issue (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/
I:N/A:N, 5.3). It is now mitigated in the latest release and is assigned
CVE-2020-26408.
Thanks @maruthi12 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.
User email exposed via GraphQL endpoint
An issue has been discovered in GitLab CE/EE affecting all versions starting
from 13.4 before 13.6.2. Information disclosure via GraphQL starting in GitLab
13.4 results in user email being unexpectedly visible. This is a medium
severity issue (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N, 5.3). We have
requested a CVE ID and will update this blog post when it is assigned.
Thanks vaib25vicky 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.
Group and project membership potentially exposed via GraphQL
Information disclosure via GraphQL in GitLab CE/EE 13.1 and later exposes
private group and project membership. This is a medium severity issue (CVSS:3.1
/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N, 5.3). We have requested a CVE ID and will
update this blog post when it is assigned.
This vulnerability has been discovered internally by the GitLab team.
Remediation
We strongly recommend that all installations running an affected version above
are upgraded to the latest version as soon as possible.
Search terms logged in search parameter in rails logs
Information disclosure in Advanced Search component of GitLab EE starting in
8.4 results in exposure of search terms via Rails logs. This is a medium
severity issue (CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N, 5.0). We have
requested a CVE ID and will update this blog post when it is assigned.
This vulnerability has been discovered internally by the GitLab team.
Remediation
We strongly recommend that all installations running an affected version above
are upgraded to the latest version as soon as possible.
Un-authorised access to feature flag user list
An issue was discovered in Gitlab CE/EE versions starting from 13.1 to 13.5
which allowed an un-authorised user to access the user list corresponding to a
feature flag in a project. This is a medium severity issue (CVSS:3.1/AV:N/AC:L/
PR:L/UI:N/S:U/C:L/I:N/A:N, 4.3). It is now mitigated in the latest release and
is assigned CVE-2020-13357.
Thanks @ashish_r_padelkar 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.
A specific query on the explore page causes statement timeouts
A potential DOS vulnerability was discovered in all versions of GitLab. Using a
specific query name for a project search can cause statement timeouts that can
lead to a potential DOS if abused. This is a medium severity issue (CVSS:3.1/
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L, 4.3). It is now mitigated in the latest
release and is assigned CVE-2020-26411.
This vulnerability has been discovered internally by the GitLab team.
Remediation
We strongly recommend that all installations running an affected version above
are upgraded to the latest version as soon as possible.
Exposure of starred projects on private user profiles
An issue has been discovered in GitLab affecting all versions starting from
12.2 before 13.6.2, all versions starting from 12.2 before 13.5.5, all versions
starting from 12.2 before 13.4.7. Information about the starred projects for
private user profiles was exposed via the GraphQL API starting in 13.4 and via
the REST API starting in 12.2. This is a medium severity issue (CVSS:3.1/AV:N/
AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N, 4.3). We have requested a CVE ID and will
update this blog post when it is assigned.
This vulnerability has been discovered internally by the GitLab team.
Remediation
We strongly recommend that all installations running an affected version above
are upgraded to the latest version as soon as possible.
Uncontrolled Resource Consumption in any Markdown field using Mermaid
A DOS vulnerability exists in Gitlab CE/EE starting with 10.3 that allows an
attacker to trigger uncontrolled resource by bypassing input validation in
markdown fields. This is a medium severity issue (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/
S:U/C:N/I:N/A:L, 4.3). It is now mitigated in the latest release and is
assigned CVE-2020-26409.
Thanks misha98857 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.
Former group members able to view updates to confidential epics
Removed group members were able to use the To-Do functionality to retrieve
updated information on confidential epics starting in GitLab EE 13.2. This is a
low severity issue (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N, 3.1). We have
requested a CVE ID and will update this blog post when it is assigned.
This vulnerability has been discovered internally by the GitLab team.
Remediation
We strongly recommend that all installations running an affected version above
are upgraded to the latest version as soon as possible.
Update GraphicsMagick dependency
The GraphicsMagick dependency has been upgraded to 1.3.35 in order to mitigate
security concerns.
Versions Affected
Affects GitLab Omnibus 11.0 and later.
Remediation
We strongly recommend that all installations running an affected version above
are upgraded to the latest version as soon as possible.
Update GnuPG dependency
The GnuPG dependency has been upgraded to 2.2.23 in order to mitigate security
concerns.
Versions Affected
Affects GitLab Omnibus 13.4 and later.
Remediation
We strongly recommend that all installations running an affected version above
are upgraded to the latest version as soon as possible.
Update libxml dependency
The libxml dependency has been upgraded to 2.9.10 in order to mitigate security
concerns.
Versions Affected
Affects GitLab Omnibus 10.8 and later.
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.
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