Security restrictions bypass in Elastic Elasticsearch

1) Improper access control

EUVDB-ID: #VU18086

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-7611

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

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

The vulnerability exists due to improper access restrictions when Field Level Security and Document Level Security are disabled and the _aliases, _shrink, or _split endpoints are used, which means that elasticsearch.yml file has xpack.security.dls_fls.enabled set to false. A remote authenticated attacker can make API calls to the _aliases, _shrink, or _split endpoints and make existing data available under a new index/alias name.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Elasticsearch: 5.6.0 - 6.6.0

External links

http://discuss.elastic.co/t/elastic-stack-6-6-1-and-5-6-15-security-update/169077
http://www.elastic.co/community/security

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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