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Authentication bypass in SilverStripe GraphQL

Moderate severity GitHub Reviewed Published Jun 10, 2021 to the GitHub Advisory Database • Updated Feb 7, 2024

Package

composer silverstripe/graphql (Composer)

Affected versions

>= 3.0.0, < 3.5.0
>= 4.0.0-alpha1, < 4.0.0-alpha2

Patched versions

3.5.0
4.0.0-alpha2

Description

The GraphQL module accepts basic-auth as an authentication method by default. This can be used to bypass MFA authentication if the silverstripe/mfa module is installed, which is now a commonly installed module. A users password is still required though.

Basic-auth has been removed as a default authentication method. If desired, it can be re-enabled by adding it to the authenticators key of a schema, or on SilverStripe\Graphql\Auth\Handler

References

Published by the National Vulnerability Database Jun 8, 2021
Reviewed Jun 10, 2021
Published to the GitHub Advisory Database Jun 10, 2021
Last updated Feb 7, 2024

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
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:L/UI:N/S:U/C:N/I:H/A:N

EPSS score

0.096%
(41st percentile)

Weaknesses

CVE ID

CVE-2020-26136

GHSA ID

GHSA-mg2g-8pwj-r2j2

Source code

No known source code

Credits

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