#VU61463 Division by zero in ClickHouse - CVE-2021-42390

Vulnerability identifier: #VU61463

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-42390

CWE-ID: CWE-369

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ClickHouse
Other software / Other software solutions

Vendor: ClickHouse

Description

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

The vulnerability exists due to the divide-by-zero issue in Delta compression codec when parsing a malicious query. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

ClickHouse: before 21.10.2.15

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External links
http://jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbms

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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