CVE-2020-13356 — An issue has been discovered in GitLab CE/EE affecting all versions starting fro

An issue has been discovered in GitLab CE/EE affecting all versions starting from 8.8.9. A specially crafted request could bypass Multipart protection and read files in certain specific paths on the server. Affected versions are: >=8.8.9, <13.3.9,>=13.4, <13.4.5,>=

01What is this vulnerability?

An issue has been discovered in GitLab CE/EE affecting all versions starting from 8.8.9. A specially crafted request could bypass Multipart protection and read files in certain specific paths on the server. Affected versions are: >=8.8.9, <13.3.9,>=13.4, <13.4.5,>=13.5, <13.5.2.

02Affected products

Vendor	Product	Versions
GitLab	GitLab CE/EE	>=8.8.9, <13.3.9, >=13.4, <13.4.5, >=13.5, <13.5.2

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2020-11-18T23:35:05.000Z
• Last modified: 2024-08-04T12:18:17.540Z

09References

• gitlab.com — https://gitlab.com/gitlab-org/gitlab/-/issues/230878
• hackerone.com — https://hackerone.com/reports/927953
• gitlab.com — https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13356.json