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
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 |