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Keycloak vulnerable to privilege escalation on Token Exchange feature

Critical severity GitHub Reviewed Published Apr 25, 2022 in keycloak/keycloak • Updated Jun 27, 2023

Package

maven org.keycloak:keycloak-services (Maven)

Affected versions

< 18.0.0

Patched versions

18.0.0

Description

A privilege escalation flaw was found in the token exchange feature of keycloak. Missing authorization allows a client application holding a valid access token to exchange tokens for any target client by passing the client_id of the target. This could allow a client to gain unauthorized access to additional services.

References

@abstractj abstractj published to keycloak/keycloak Apr 25, 2022
Published to the GitHub Advisory Database Apr 26, 2022
Reviewed Apr 26, 2022
Published by the National Vulnerability Database Jul 8, 2022
Last updated Jun 27, 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
High
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:H/A:H

EPSS score

0.240%
(63rd percentile)

Weaknesses

CVE ID

CVE-2022-1245

GHSA ID

GHSA-75p6-52g3-rqc8

Source code

Credits

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