Vulnerability identifier: #VU72725

Vulnerability risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-0264

CWE-ID: CWE-288

Exploitation vector: Network

Exploit availability: No

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

Vendor: Keycloak

Description

The vulnerability allows a remote user to impersonate application users.

The vulnerability exists due to an error when handling authentication requests in the OpenID Connect user authentication. A remote authenticated user who can obtain a certain piece of info from a victim's user request from the same realm can use that data to impersonate the victim and generate new session tokens.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Keycloak: 20.0.3 - 21.0.0

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External links
http://github.com/keycloak/keycloak/security/advisories/GHSA-9g98-5mj6-f9mv

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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