Skip to content

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

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
None
Integrity
Low
Availability
None

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:N/I:L/A:N

EPSS score

0.082%
(36th percentile)

Weaknesses

CVE ID

CVE-2021-3424

GHSA ID

GHSA-pf38-cw3p-22q9

Source code

Loading Checking history
See something to contribute? Suggest improvements for this vulnerability.