CVE-2017-17716 — GitLab 9

GitLab 9.4.x before 9.4.2 does not support LDAP SSL certificate verification, but a verify_certificates LDAP option was mentioned in the 9.4 release announcement. This issue occurred because code was not merged. This is related to use of the omniauth-ldap library and the gitlab_o

01What is this vulnerability?

GitLab 9.4.x before 9.4.2 does not support LDAP SSL certificate verification, but a verify_certificates LDAP option was mentioned in the 9.4 release announcement. This issue occurred because code was not merged. This is related to use of the omniauth-ldap library and the gitlab_omniauth-ldap gem.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

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: 2017-12-17T17:29:00.227
• Last modified: 2026-05-13T00:24:29.033

09References

• about.gitlab.com — https://about.gitlab.com/2017/07/22/gitlab-9-4-released/#security---add-ldap-ssl…
• about.gitlab.com — https://about.gitlab.com/2017/07/28/gitlab-9-dot-4-dot-2-released/
• gitlab.com — https://gitlab.com/gitlab-org/gitlab-ce/issues/30420
• about.gitlab.com — https://about.gitlab.com/2017/07/22/gitlab-9-4-released/#security---add-ldap-ssl…
• about.gitlab.com — https://about.gitlab.com/2017/07/28/gitlab-9-dot-4-dot-2-released/
• gitlab.com — https://gitlab.com/gitlab-org/gitlab-ce/issues/30420