PT-2021-11425 · Red Hat · Keycloak

Published 2021-03-08 · Updated 2025-02-25 · CVE-2020-27838

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: Keycloak versions prior to 13.0.0

Description: A flaw was found in the client registration endpoint, allowing it to fetch information about PUBLIC clients, such as client secrets, without authentication. This could be an issue if the same PUBLIC client is later changed to CONFIDENTIAL, posing a threat to data confidentiality.

Recommendations: For versions prior to 13.0.0, update to version 13.0.0 or later to resolve the issue. As a temporary workaround, consider restricting access to the client registration endpoint to minimize the risk of exploitation.

Fix

Improper Authentication

Weakness Enumeration

CWE-287

Related Identifiers

CVE-2020-27838

GHSA-PCV5-M2WH-66J3

Affected Products

Keycloak

References · 11

• https://osv.dev/vulnerability/CVE-2020-27838 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-pcv5-m2wh-66j3 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-27838 · Security Note
• https://bugzilla.redhat.com/show_bug.cgi?id=1906797 · Vendor Advisory
• https://github.com/keycloak/keycloak/pull/7790 · Note
• https://github.com/keycloak/keycloak/commit/9356843c6c3d7097d010b3bb6f91e25fcaba378c · Note
• https://twitter.com/t0t3kingpad4/status/1887546726963204379 · Twitter Post
• https://twitter.com/DhiyaneshDK/status/1747434212808929512 · Twitter Post
• https://twitter.com/Jayesh25_/status/1747916556212805716 · Twitter Post
• https://twitter.com/Mohamme31752968/status/1754849232970797125 · Twitter Post
• https://twitter.com/cappricio_sec/status/1894364223108780389 · Twitter Post