#VU18086 Improper access control in Elasticsearch - CVE-2019-7611

Vulnerability identifier: #VU18086

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-7611

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Elasticsearch
Web applications / Other software

Vendor: Elastic Stack

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 - 5.6.14, 6.6.0

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

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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.