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XWiki OIDC Authenticator vulnerable to bypassing OpenID login by providing a custom provider

Critical severity GitHub Reviewed Published Nov 4, 2022 in xwiki-contrib/oidc • Updated Jan 29, 2023

Package

maven org.xwiki.contrib.oidc:oidc-authenticator (Maven)

Affected versions

< 1.29.1

Patched versions

1.29.1

Description

Impact

Even if a wiki has an OpenID provider configured through its xwiki.properties, it is possible to provide a third party provider by providing its details through request parameters. One can then bypass the XWiki authentication altogether by specifying its own provider through the oidc.endpoint.* request parameters (or by using an XWiki-based OpenID provider with oidc.xwikiprovider.

With the same approach, one could also provide a specific group mapping through oidc.groups.mapping that would make his user automatically part of the XWikiAdminGroup

Patches

Patched in version 1.29.1.

Workarounds

There is no workaround, an upgrade of the authenticator is required.

References

https://jira.xwiki.org/browse/OIDC-118

For more information

If you have any questions or comments about this advisory:

  • Open an issue in Jira XWiki
  • Email us at our security mailing list

References

@tmortagne tmortagne published to xwiki-contrib/oidc Nov 4, 2022
Published to the GitHub Advisory Database Nov 4, 2022
Reviewed Nov 4, 2022
Published by the National Vulnerability Database Nov 4, 2022
Last updated Jan 29, 2023

Severity

Critical

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
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

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:N/S:U/C:H/I:N/A:H

EPSS score

0.152%
(52nd percentile)

Weaknesses

CVE ID

CVE-2022-39387

GHSA ID

GHSA-m7gv-v8xx-v47w

Source code

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