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Keycloak is vulnerable to IDN homograph attack

Moderate severity GitHub Reviewed Published Apr 28, 2022 to the GitHub Advisory Database • Updated Jan 30, 2023

Package

maven org.keycloak:keycloak-services (Maven)

Affected versions

< 18.0.0

Patched versions

18.0.0

Description

A flaw was found in keycloak as shipped in Red Hat Single Sign-On 7.4 where IDN homograph attacks are possible. A malicious user can register himself with a name already registered and trick admin to grant him extra privileges.

References

Published by the National Vulnerability Database Jun 1, 2021
Published to the GitHub Advisory Database Apr 28, 2022
Reviewed Apr 28, 2022
Last updated Jan 30, 2023

Severity

Moderate
5.3
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Weaknesses

CVE ID

CVE-2021-3424

GHSA ID

GHSA-pf38-cw3p-22q9

Source code

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