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CVE-2021-32675

Published: 4 October 2021

Redis is an open source, in-memory database that persists on disk. When parsing an incoming Redis Standard Protocol (RESP) request, Redis allocates memory according to user-specified values which determine the number of elements (in the multi-bulk header) and size of each element (in the bulk header). An attacker delivering specially crafted requests over multiple connections can cause the server to allocate significant amount of memory. Because the same parsing mechanism is used to handle authentication requests, this vulnerability can also be exploited by unauthenticated users. The problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14. An additional workaround to mitigate this problem without patching the redis-server executable is to block access to prevent unauthenticated users from connecting to Redis. This can be done in different ways: Using network access control tools like firewalls, iptables, security groups, etc. or Enabling TLS and requiring users to authenticate using client side certificates.

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
focal
Released (5:5.0.7-2ubuntu0.1+esm1)
Available with Ubuntu Pro
hirsute Ignored
(end of life)
impish Ignored
(end of life)
jammy Not vulnerable
(5:6.0.16-1)
kinetic Not vulnerable
(5:6.0.16-1)
lunar Not vulnerable
(5:6.0.16-1)
mantic Not vulnerable
(5:6.0.16-1)
noble Not vulnerable
(5:6.0.16-1)
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

Severity score breakdown

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