Denial of service in Elasticsearch

1) Resource exhaustion

EUVDB-ID: #VU54639

Risk: Medium

CVSSv4.0: 5.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/U:Green]

CVE-ID: CVE-2021-22144

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to an uncontrolled recursion issue in the Elasticsearch Grok parser. A remote authenticated attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Elasticsearch: 6.8.0 - 7.13.2

CPE2.3

• cpe:2.3:a:elastic_stack:elasticsearch:6.8.0:*:*:*:*:*:*:*
• cpe:2.3:a:elastic_stack:elasticsearch:6.8.1:*:*:*:*:*:*:*
• cpe:2.3:a:elastic_stack:elasticsearch:6.8.2:*:*:*:*:*:*:*
• cpe:2.3:a:elastic_stack:elasticsearch:6.8.3:*:*:*:*:*:*:*
• cpe:2.3:a:elastic_stack:elasticsearch:6.8.4:*:*:*:*:*:*:*
• cpe:2.3:a:elastic_stack:elasticsearch:6.8.5:*:*:*:*:*:*:*
• cpe:2.3:a:elastic_stack:elasticsearch:6.8.6:*:*:*:*:*:*:*
• cpe:2.3:a:elastic_stack:elasticsearch:6.8.7:*:*:*:*:*:*:*
• cpe:2.3:a:elastic_stack:elasticsearch:6.8.8:*:*:*:*:*:*:*
• cpe:2.3:a:elastic_stack:elasticsearch:6.8.9:*:*:*:*:*:*:*

External links

https://www.elastic.co/community/security#ESA-2021-15

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.