Authentication bypass in Apache ZooKeeper

1) Improper authentication

EUVDB-ID: #VU12913

Risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-8012

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication and write arbitrary files on the target system.

The weakness exists due to missing authentication to join a quorum. A remote attacker can bypass authentication, join the cluster and propagate changes to the cluster leader.

Mitigation

Update to version 3.4.10 or 3.5.4-beta.

Vulnerable software versions

ZooKeeper: 3.4.8 - 3.5.3 beta

External links

http://zookeeper.apache.org/security.html#CVE-2018-8012

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.