Denial of service in Red Hat Keycloak

1) Infinite loop

EUVDB-ID: #VU13997

Risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-10912

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

The vulnerability allows a remote authenticated attacker to cause DoS condition on the target system.

The vulnerability exists due to mishandling of expired session replacement. A remote attacker who has access to a Keycloak cluster with multiple nodes can trigger an infinite loop and cause the service to crash.

Mitigation

Update to version 4.0.0.

Vulnerable software versions

Keycloak: 0.6.0 - 3.4.2

External links

http://access.redhat.com/security/cve/cve-2018-10912

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.