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Vulnerability Details : CVE-2021-32675

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.
Publish Date : 2021-10-04 Last Update Date : 2021-11-28
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- CVSS Scores & Vulnerability Types

CVSS Score
5.0
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 770

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2021:3918: redis:5 security update (Important) oval:com.redhat.rhsa:def:20213918 unix
RHSA-2021:3945: redis:6 security update (Important) oval:com.redhat.rhsa:def:20213945 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2021-32675

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 10.0 * * * Version Details Vulnerabilities
2 OS Debian Debian Linux 11.0 * * * Version Details Vulnerabilities
3 OS Fedoraproject Fedora 33 * * * Version Details Vulnerabilities
4 OS Fedoraproject Fedora 34 * * * Version Details Vulnerabilities
5 OS Fedoraproject Fedora 35 * * * Version Details Vulnerabilities
6 Application Netapp HCI - * * * Version Details Vulnerabilities
7 Application Netapp Management Services For Element Software - * * * Version Details Vulnerabilities
8 Application Redis Redis * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 2
Fedoraproject Fedora 3
Netapp HCI 1
Netapp Management Services For Element Software 1
Redis Redis 1

- References For CVE-2021-32675

https://www.debian.org/security/2021/dsa-5001
DEBIAN DSA-5001
https://lists.apache.org/thread.html/[email protected]%3Cnotifications.geode.apache.org%3E
MLIST [geode-notifications] 20211013 [GitHub] [geode] jdeppe-pivotal opened a new pull request #6994: GEODE-9676: Limit array and string sizes for unauthenticated Radish connections
https://lists.fedoraproject.org/archives/list/[email protected]/message/WR5WKJWXD4D6S3DJCZ56V74ESLTDQRAB/
FEDORA FEDORA-2021-aa94492a09
https://security.netapp.com/advisory/ntap-20211104-0003/ CONFIRM
https://lists.fedoraproject.org/archives/list/[email protected]/message/HTYQ5ZF37HNGTZWVNJD3VXP7I6MEEF42/
FEDORA FEDORA-2021-61c487f241
https://lists.fedoraproject.org/archives/list/[email protected]/message/VL5KXFN3ATM7IIM7Q4O4PWTSRGZ5744Z/
FEDORA FEDORA-2021-8913c7900c
https://github.com/redis/redis/commit/5674b0057ff2903d43eaff802017eddf37c360f8
https://github.com/redis/redis/security/advisories/GHSA-f6pw-v9gw-v64p CONFIRM

- Metasploit Modules Related To CVE-2021-32675

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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