CVE-2020-12283 — Sourcegraph before 3

Sourcegraph before 3.15.1 has a vulnerable authentication workflow because of improper validation in the SafeRedirectURL method in cmd/frontend/auth/redirect.go, such as for the //foo//example.com substring.

01What is this vulnerability?

Sourcegraph before 3.15.1 has a vulnerable authentication workflow because of improper validation in the SafeRedirectURL method in cmd/frontend/auth/redirect.go, such as for the //foo//example.com substring.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

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: 2020-04-30T04:07:29.000Z
• Last modified: 2024-08-04T11:48:58.390Z

09References

• github.com — https://github.com/sourcegraph/sourcegraph/pull/10167
• github.com — https://github.com/sourcegraph/sourcegraph/compare/v3.15.0...v3.15.1
• github.com — https://github.com/sourcegraph/sourcegraph/commit/c0f48172e815c7f66471a38f0a06d1…
• github.com — https://github.com/sourcegraph/sourcegraph/blob/master/CHANGELOG.md
• securitylab.github.com — https://securitylab.github.com/advisories/GHSL-2020-085-sourcegraph