CVE-2021-32675

Common vulnerabilities & exposures (CVE)

CVE database CVE database blogpost Release & EoL database

Published at: - 04-10-2021 08:15

Last modified: - 13-05-2022 07:21

Total changes: - 8

Description

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Low

Attack complexity

Network

Attack vector

High

Availability

None

Confidentiality

None

Integrity

None

Privileges required

Unchanged

Scope

None

User interaction

7.5

Base score

3.9

3.6

Exploitability score

Impact score

Verification logic

vendor=redis AND product=redis AND versionStartIncluding=6.2.0 AND versionEndExcluding=6.2.6

vendor=redis AND product=redis AND versionStartIncluding=6.0.0 AND versionEndExcluding=6.0.16

vendor=redis AND product=redis AND versionStartIncluding=5.0.0 AND versionEndExcluding=5.0.14

vendor=fedoraproject AND product=fedora AND version=33

vendor=fedoraproject AND product=fedora AND version=34

vendor=fedoraproject AND product=fedora AND version=35

vendor=Debian AND product=debian_linux AND version=10.0

vendor=Debian AND product=debian_linux AND version=11.0

vendor=netapp AND product=management_services_for_element_software AND version=-

vendor=netapp AND product=management_services_for_netapp_hci AND version=-

vendor=oracle AND product=communications_operations_monitor AND version=4.3

vendor=oracle AND product=communications_operations_monitor AND version=4.4

vendor=oracle AND product=communications_operations_monitor AND version=5.0

Reference

https://github.com/redis/redis/commit/5674b0057ff2903d43eaff802017eddf37c360f8
https://github.com/redis/redis/security/advisories/GHSA-f6pw-v9gw-v64p
FEDORA-2021-8913c7900c-Mailing List, Third Party Advisory
FEDORA-2021-61c487f241-Mailing List, Third Party Advisory
[geode-notifications] 20211013 [GitHub] [geode] jdeppe-pivotal opened a new pull request #6994: GEODE-9676: Limit array and string sizes for unauthenticated Radish connections-Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20211104-0003/
FEDORA-2021-aa94492a09-Mailing List, Third Party Advisory
DSA-5001-Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html

Keywords

CVE-2021-32675

Common vulnerabilities & exposures (CVE)

Description

Common Vulnerability Scoring System (CVSS)

Verification logic

Reference

NVD

CVE-2021-32675

CVE

Common vulnerabilities & exposures

CVSS

Common vulnerability scoring system

Security

Vulnerabilities

Exposures