Security restrictions bypass in Keycloak

1) Security restrictions bypass

EUVDB-ID: #VU49112

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-2020-27826

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote user to escalate privileges within the application.

The vulnerability exists within the REST API functionality. Remote users can change their attributes, such as NameID and impersonate administrative users of the application.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Keycloak: 0.6.0 - 11.0.3

CPE2.3

• cpe:2.3:a:keycloak:keycloak:11.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:keycloak:keycloak:7.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:keycloak:keycloak:6.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:keycloak:keycloak:10.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:keycloak:keycloak:9.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:keycloak:keycloak:8.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:keycloak:keycloak:1.9.8:*:*:*:*:*:*:*
• cpe:2.3:a:keycloak:keycloak:2.5.10:*:*:*:*:*:*:*
• cpe:2.3:a:keycloak:keycloak:3.4.3:*:*:*:*:*:*:*
• cpe:2.3:a:keycloak:keycloak:4.8.3:*:*:*:*:*:*:*
• cpe:2.3:a:keycloak:keycloak:5.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:keycloak:keycloak:0.6.0:*:*:*:*:*:*:*

External links

http://access.redhat.com/errata/RHSA-2020:5526
http://bugzilla.redhat.com/show_bug.cgi?id=1905089

Q & A

Can this vulnerability be exploited remotely?

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