Keycloak vulnerable to session hijacking via re-authentication

高 8.8CVE-2023-6787 · GHSA-c9h6-v78w-52wj · 25/04/2024 公開 · 17/06/2026 更新

要点

CVE-2023-6787 は org.keycloak:keycloak-services, keycloak (redhat) に影響する深刻度「高」 (CVSS 8.8) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.74%（全脆弱性の 54.8% より高い）。
対処：24.0.3, 22.0.10 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
org.keycloak:keycloak-services Maven	`≥ 23.0.0, < 24.0.3< 22.0.10`	`24.0.322.0.10`
keycloak redhat	`≥ 23.0.0, < 24.0.3< 22.0.10`	`24.0.322.0.10`

概要

A flaw was found in Keycloak. An active keycloak session can be hijacked by initiating a new authentication (having the query parameter prompt=login) and forcing the user to enter his credentials once again. If the user cancels this re-authentication by clicking Restart login, the account takeover could take place as the new session, with a different SUB, will have the same SID as the previous session.

NVD の説明

A flaw was found in Keycloak that occurs from an error in the re-authentication mechanism within org.keycloak.authentication. This flaw allows hijacking an active Keycloak session by triggering a new authentication process with the query parameter "prompt=login," prompting the user to re-enter their credentials. If the user cancels this re-authentication by selecting "Restart login," an account takeover may occur, as the new session, with a different SUB, will possess the same SID as the previous session.