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keycloak-core: open redirect via "form_post.jwt" JARM response mode

Moderate severity GitHub Reviewed Published Jan 22, 2024 in keycloak/keycloak • Updated Dec 26, 2024

Package

maven org.keycloak:keycloak-core (Maven)

Affected versions

< 23.0.4

Patched versions

23.0.4

Description

An incomplete fix was found in Keycloak Core patch. An attacker can steal authorization codes or tokens from clients using a wildcard in the JARM response mode "form_post.jwt". It is observed that changing the response_mode parameter in the original proof of concept from "form_post" to "form_post.jwt" can bypass the security patch implemented to address CVE-2023-6134.

References

@abstractj abstractj published to keycloak/keycloak Jan 22, 2024
Published to the GitHub Advisory Database Jan 23, 2024
Reviewed Jan 23, 2024
Last updated Dec 26, 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
Required
Scope
Unchanged
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:L/UI:R/S:U/C:L/I:L/A:N

EPSS score

0.350%
(72nd percentile)

Weaknesses

CVE ID

CVE-2023-6927

GHSA ID

GHSA-9vm7-v8wj-3fqw

Source code

Credits

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