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CVE-2021-32762

Published: 4 October 2021

Redis is an open source, in-memory database that persists on disk. The redis-cli command line tool and redis-sentinel service may be vulnerable to integer overflow when parsing specially crafted large multi-bulk network replies. This is a result of a vulnerability in the underlying hiredis library which does not perform an overflow check before calling the calloc() heap allocation function. This issue only impacts systems with heap allocators that do not perform their own overflow checks. Most modern systems do and are therefore not likely to be affected. Furthermore, by default redis-sentinel uses the jemalloc allocator which is also not vulnerable. The problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14.

Notes

AuthorNote
seth-arnold
this appears to be about systems with a non-functional
calloc() call. This feels like it should be a bug report abuot those
allocator libraries with a broken calloc() instead. I assume this is
not actually applicable to anything we ship.

Priority

Negligible

Cvss 3 Severity Score

8.8

Score breakdown

Status

Package Release Status
discque
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

kinetic Does not exist

lunar Does not exist

mantic Does not exist

trusty Does not exist

upstream Not vulnerable

xenial Ignored
(end of standard support)
hiredis
Launchpad, Ubuntu, Debian
bionic Not vulnerable

focal Not vulnerable

hirsute Not vulnerable

impish Not vulnerable

jammy Not vulnerable

kinetic Not vulnerable

lunar Not vulnerable

mantic Not vulnerable

trusty Not vulnerable

upstream Not vulnerable

xenial Needs triage

nginx
Launchpad, Ubuntu, Debian
bionic Not vulnerable

focal Not vulnerable

hirsute Not vulnerable

impish Not vulnerable

jammy Not vulnerable

kinetic Not vulnerable

lunar Not vulnerable

mantic Not vulnerable

trusty Not vulnerable

upstream Not vulnerable

xenial Not vulnerable

python-hiredis
Launchpad, Ubuntu, Debian
bionic Not vulnerable

focal Not vulnerable

hirsute Not vulnerable

impish Not vulnerable

jammy Not vulnerable

kinetic Not vulnerable

lunar Not vulnerable

mantic Not vulnerable

trusty Does not exist

upstream Not vulnerable

xenial Needs triage

redis
Launchpad, Ubuntu, Debian
bionic Not vulnerable

focal Not vulnerable

hirsute Not vulnerable

impish Not vulnerable

jammy Not vulnerable

kinetic Not vulnerable

lunar Not vulnerable

mantic Not vulnerable

trusty Not vulnerable

upstream
Released (5:6.0.16-1)
xenial Needs triage

rspamd
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Not vulnerable

hirsute Not vulnerable

impish Not vulnerable

jammy Not vulnerable

kinetic Not vulnerable

lunar Not vulnerable

mantic Not vulnerable

trusty Does not exist

upstream Not vulnerable

xenial Ignored
(end of standard support)
webdis
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Not vulnerable

hirsute Not vulnerable

impish Not vulnerable

jammy Not vulnerable

kinetic Not vulnerable

lunar Not vulnerable

mantic Not vulnerable

trusty Does not exist

upstream Not vulnerable

xenial Needs triage

Severity score breakdown

Parameter Value
Base score 8.8
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H