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Keycloak Cross-site Scripting (XSS) via assertion consumer service URL in SAML POST-binding flow

Moderate severity GitHub Reviewed Published Apr 17, 2024 in keycloak/keycloak • Updated Aug 29, 2024

Package

maven org.keycloak:keycloak-services (Maven)

Affected versions

< 22.0.10
>= 23.0.0, < 24.0.3

Patched versions

22.0.10
24.0.3

Description

Keycloak allows arbitrary URLs as SAML Assertion Consumer Service POST Binding URL (ACS), including JavaScript URIs (javascript:).

Allowing JavaScript URIs in combination with HTML forms leads to JavaScript evaluation in the context of the embedding origin on form submission.

Acknowledgements:

Special thanks to Lauritz Holtmann for reporting this issue and helping us improve our project.

References

@abstractj abstractj published to keycloak/keycloak Apr 17, 2024
Published to the GitHub Advisory Database Apr 17, 2024
Reviewed Apr 17, 2024
Published by the National Vulnerability Database Apr 25, 2024
Last updated Aug 29, 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
High
Privileges required
High
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low

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:H/PR:H/UI:R/S:U/C:H/I:H/A:L

EPSS score

0.044%
(11th percentile)

Weaknesses

CVE ID

CVE-2023-6717

GHSA ID

GHSA-8rmm-gm28-pj8q

Source code

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