#VU53530 Insufficient Session Expiration in Keycloak - CVE-2021-3461

Vulnerability identifier: #VU53530

Vulnerability risk: Low

CVSSv4.0: 0.4 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-3461

CWE-ID: CWE-613

Exploitation vector: Local

Exploit availability: No

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

Vendor: Keycloak

Description

The vulnerability allows an attacker to gain access to sensitive information.

The vulnerability exists due to the way Keycloak handles backchannel logout requests. If the logout request comes from an external SAML identity provider and Principal Type is set to Attribute [Name], the application ignores such request.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Keycloak: 10.0.0 - 13.0.0

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External links
https://access.redhat.com/errata/RHSA-2021:2063
https://bugzilla.redhat.com/show_bug.cgi?id=1941565

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Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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