CVE-2021-32765

Name	CVE-2021-32765
Description	Hiredis is a minimalistic C client library for the Redis database. In affected versions Hiredis is vulnurable to integer overflow if provided maliciously crafted or corrupted `RESP` `mult-bulk` protocol data. When parsing `multi-bulk` (array-like) replies, hiredis fails to check if `count * sizeof(redisReply*)` can be represented in `SIZE_MAX`. If it can not, and the `calloc()` call doesn't itself make this check, it would result in a short allocation and subsequent buffer overflow. Users of hiredis who are unable to update may set the [maxelements](https://github.com/redis/hiredis#reader-max-array-elements) context option to a value small enough that no overflow is possible.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-2783-1, ELA-499-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
hiredis (PTS)	jessie, jessie (lts)	0.11.0-4+deb8u2	fixed
	stretch	0.13.3-2	fixed
	stretch (security), stretch (lts)	0.13.3-1+deb9u1	fixed
	buster	0.14.0-3	vulnerable
	bullseye	0.14.1-1	vulnerable
	bookworm	0.14.1-3	fixed
	sid, trixie	1.2.0-6	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin
hiredis	source	jessie	0.11.0-4+deb8u2		ELA-499-1
hiredis	source	stretch	0.13.3-1+deb9u1		DLA-2783-1
hiredis	source	(unstable)	0.14.1-2	unimportant

Notes

https://github.com/redis/hiredis/security/advisories/GHSA-hfm9-39pp-55p2
https://github.com/redis/hiredis/commit/76a7b10005c70babee357a7d0f2becf28ec7ed1e (v1.0.1)
Only a hardening for insecure libcs:
https://github.com/redis/hiredis/commit/76a7b10005c70babee357a7d0f2becf28ec7ed1e#commitcomment-57544143