Keycloak: exposure of sensitive information in pushed authorization requests (par) kc_restart cookie

7.5 CVSS

Vulnerability Description

A flaw was found in Keycloak in OAuth 2.0 Pushed Authorization Requests (PAR). Client-provided parameters were found to be included in plain text in the KC_RESTART cookie returned by the authorization server's HTTP response to a `request_uri` authorization request, possibly leading to an information disclosure vulnerability.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

Red Hat would like to thank Manuel Schallar for reporting this issue.

References

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Affected Vendor

Unknown

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Affected Software

Red Hat Build of Keycloak, Red Hat build of Keycloak 22, Red Hat build of Keycloak 24, Red Hat Single Sign-On 7, Red Hat Single Sign-On 7.6 for RHEL 7, Red Hat Single Sign-On 7.6 for RHEL 8, Red Hat Single Sign-On 7.6 for RHEL 9, RHEL-8 based Middleware Containers

Vulnerable Versions:

d5e82356f90893ca3b308a7e10020103e402369a, 22.0.11-2, 22-15, 22-18, 24.0.5-2, 24-10, 0:18.0.14-1.redhat_00001.1.el7sso, 0:18.0.14-1.redhat_00001.1.el8sso, 0:18.0.14-1.redhat_00001.1.el9sso, 7.6-49