CVE-2019-5464 — A flawed DNS rebinding protection issue was discovered in GitLab CE/EE 10

A flawed DNS rebinding protection issue was discovered in GitLab CE/EE 10.2 and later in the `url_blocker.rb` which could result in SSRF where the library is utilized.

01What is this vulnerability?

A flawed DNS rebinding protection issue was discovered in GitLab CE/EE 10.2 and later in the `url_blocker.rb` which could result in SSRF where the library is utilized.

02Affected products

Vendor	Product	Versions
GitLab	GitLab CE/EE	Affects GitLab CE/EE 10.2 and later, Fixed in 12.1.2 in 12.0.4 and in 11.11.6

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: 2020-01-28T02:23:14.000Z
• Last modified: 2024-08-04T19:54:53.478Z

09References

• about.gitlab.com — https://about.gitlab.com/releases/2019/07/29/security-release-gitlab-12-dot-1-do…
• hackerone.com — https://hackerone.com/reports/632101
• gitlab.com — https://gitlab.com/gitlab-org/gitlab-ce/issues/63959