#VU77750 Cross-site scripting in Keycloak - CVE-2022-4361

Vulnerability identifier: #VU77750

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-4361

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Keycloak
Server applications / Directory software, identity management

Vendor: Keycloak

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists in the SAML or OIDC providers in Keycloak due to insufficient sanitization of user-supplied data passed via the AssertionConsumerServiceURL value or the redirect_uri. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Keycloak: 10.0.0 - 19.0.3, 20.0.0 - 21.1.1

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External links
https://access.redhat.com/errata/RHSA-2023:3892
https://github.com/keycloak/keycloak/security/advisories/GHSA-3p62-6fjh-3p5h

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.