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CVE-2021-32628

Published: 4 October 2021

Redis is an open source, in-memory database that persists on disk. An integer overflow bug in the ziplist data structure used by all versions of Redis can be exploited to corrupt the heap and potentially result with remote code execution. The vulnerability involves modifying the default ziplist configuration parameters (hash-max-ziplist-entries, hash-max-ziplist-value, zset-max-ziplist-entries or zset-max-ziplist-value) to a very large value, and then constructing specially crafted commands to create very large ziplists. The problem is fixed in Redis versions 6.2.6, 6.0.16, 5.0.14. An additional workaround to mitigate the problem without patching the redis-server executable is to prevent users from modifying the above configuration parameters. This can be done using ACL to restrict unprivileged users from using the CONFIG SET command.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
redis
Launchpad, Ubuntu, Debian
bionic
Released (5:4.0.9-1ubuntu0.2+esm3)
Available with Ubuntu Pro
kinetic Not vulnerable
(5:6.0.16-1)
impish Ignored
(end of life)
hirsute Ignored
(end of life)
trusty
Released (2:2.8.4-2ubuntu0.2+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (5:6.0.16-1)
xenial
Released (2:3.0.6-1ubuntu0.4+esm1)
Available with Ubuntu Pro
jammy Not vulnerable
(5:6.0.16-1)
lunar Not vulnerable
(5:6.0.16-1)
focal
Released (5:5.0.7-2ubuntu0.1+esm1)
Available with Ubuntu Pro
mantic Not vulnerable
(5:6.0.16-1)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H