An open redirect vulnerability was found in Keycloak. A specially crafted URL can be constructed where the referrer and referrer_uri parameters are made to trick a user to visit a malicious webpage. A trusted URL can trick users and automation into believing that the URL is safe, when, in fact, it redirects to a malicious server. This issue can result in a victim inadvertently trusting the destination of the redirect, potentially leading to a successful phishing attack or other types of attacks.

Once a crafted URL is made, it can be sent to a Keycloak admin via email for example. This will trigger this vulnerability when the user visits the page and clicks the link. A malicious actor can use this to target users they know are Keycloak admins for further attacks. It may also be possible to bypass other domain-related security checks, such as supplying this as a OAuth redirect uri. The malicious actor can further obfuscate the redirect_uri using URL encoding, to hide the text of the actual malicious website domain.

Red Hat, Inc. AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Red Hat, Inc. CWE-601

Red Hat, Inc. https://access.redhat.com/errata/RHSA-2024:6502 [No types assigned]

Red Hat, Inc. https://access.redhat.com/errata/RHSA-2024:6503 [No types assigned]

Red Hat, Inc. https://access.redhat.com/security/cve/CVE-2024-7260 [No types assigned]

Red Hat, Inc. https://bugzilla.redhat.com/show_bug.cgi?id=2301875 [No types assigned]