CVE-2021-42391

Name	CVE-2021-42391
Description	Divide-by-zero in Clickhouse's Gorilla compression codec when parsing a malicious query. The first byte of the compressed buffer is used in a modulo operation without being checked for 0.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
clickhouse (PTS)	buster	18.16.1+ds-4	fixed
	buster (security)	18.16.1+ds-4+deb10u1	fixed
	bullseye	18.16.1+ds-7.2+deb11u1	fixed
	bookworm, sid	18.16.1+ds-7.3	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
clickhouse	source	(unstable)	(not affected)

- clickhouse <not-affected> (Vulnerable code introduced later)
https://jfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbms/