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Open redirect vulnerability in Sourcegraph

Moderate severity GitHub Reviewed Published Apr 30, 2020 in sourcegraph/sourcegraph-public-snapshot • Updated Oct 2, 2023

Package

gomod github.com/sourcegraph/sourcegraph (Go)

Affected versions

< 3.14.4
>= 3.15.0, < 3.15.1

Patched versions

3.14.4
3.15.1

Description

Impact

An open redirect vulnerability that allows users to be targeted for phishing attacks has been found in Sourcegraph instances configured with OAuth, OpenID, or SAML authentication enabled. Users targeted by these phishing attacks could have their authentication tokens silently harvested by an attacker.

Specific Go Packages Affected

github.com/sourcegraph/sourcegraph/cmd/frontend/auth

Resolution

Sourcegraph v3.14.4 and v3.15.1 have been released which resolve the vulnerability. (associated change)

Workarounds

Disabling OAuth, OpenID and/or SAML sign-in options until upgraded to the patched versions will secure Sourcegraph / workaround the issue.

Timeline

  • Apr 23, 8 AM PST: GitHub Security Lab reported the issue to Sourcegraph.
  • Apr 23, 11 PM PST: A Sourcegraph engineer proposed a resolution for the vulnerability. https://github.com/sourcegraph/sourcegraph/pull/10167
  • Apr 24, 3 AM PST: The proposed resolution was reviewed, approved, and merged.
  • Apr 28, 2 PM PST: Patch releases for 3.14.4 and 3.15.1 were published.
  • Apr 29, 10 PM PST: Mitre publicly disclosed CVE-2020-12283.
  • Apr 30, 11 AM PST: Sourcegraph issued a GitHub security advisory and notified all affected users.

References

For more information

If you have any questions or comments about this advisory, please contact us at support@sourcegraph.com and include CVE-2020-12283 in the title.

References

@nicksnyder nicksnyder published to sourcegraph/sourcegraph-public-snapshot Apr 30, 2020
Reviewed May 24, 2021
Published to the GitHub Advisory Database Dec 20, 2021
Last updated Oct 2, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS score

0.124%
(48th percentile)

Weaknesses

CVE ID

CVE-2020-12283

GHSA ID

GHSA-mx43-r985-5h4m

Source code

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