Session takeover in keycloak

1) Insufficient Session Expiration

EUVDB-ID: #VU70166

Risk: Low

CVSSv3.1: 4.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-3916

CWE-ID: CWE-613 - Insufficient Session Expiration

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to reuse of session ids across root and user authentication sessions when using a client with the offline_access scope. An attacker with ability to obtain the root session ID can utilize the refresh token and authenticate to the application as another user.

The issue affects shared environments, where the attacker is able to obtain victim's cookies after the victim logs out.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Keycloak: 1.0 - 19.0.2

External links

http://github.com/keycloak/keycloak/security/advisories/GHSA-97g8-xfvw-q4hg

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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