Keycloak: session takeover with oidc offline refreshtokens

6.8 CVSS

Vulnerability Description

A flaw was found in the offline_access scope in Keycloak. This issue would affect users of shared computers more (especially if cookies are not cleared), due to a lack of root session validation, and the reuse of session ids across root and user authentication sessions. This enables an attacker to resolve a user session attached to a previously authenticated user; when utilizing the refresh token, they will be issued a token for the original user.

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 Peter Flintholm (Trifork) for reporting this issue.

References

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Affected Vendor

Red Hat

View all reports →

Affected Software

Red Hat Single Sign-On 7, Red Hat Single Sign-On 7.6.1, 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:

0:18.0.3-1.redhat_00002.1.el7sso, 0:18.0.6-1.redhat_00001.1.el7sso, 0:18.0.3-1.redhat_00002.1.el8sso, 0:18.0.6-1.redhat_00001.1.el8sso, 0:18.0.3-1.redhat_00002.1.el9sso, 0:18.0.6-1.redhat_00001.1.el9sso, 7.6-15, 7.6-20