Bug 2011000 (CVE-2021-32675)

Summary:	CVE-2021-32675 redis: Denial of service via Redis Standard Protocol (RESP) request
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	agerstmayr, amackenz, amasferr, apevec, bcoca, bdettelb, caswilli, chazlett, chousekn, cmeyers, davidn, dbecker, drieden, fabian.deutsch, fedora, fpercoco, gblomqui, gghezzo, gparvin, hhorak, jal233, jcammara, jhardy, jjoyce, jobarker, jorton, jramanat, jschluet, jwong, kaycoth, lhh, lpeer, mabashia, mburns, mgoodwin, mkudlej, nathans, notting, osapryki, pahickey, rcollet, redis-maint, relrod, rhos-maint, rpetrell, sclewis, sdoran, slinaber, smcdonal, stcannon, tjochec, tkuratom, vmugicag
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	redis 6.2.6, redis 6.0.16, redis 5.0.14	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in redis. 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). This flaw allows an unauthenticated, remote user delivering specially crafted requests over multiple connections to cause the server to allocate a significant amount of memory, resulting in a denial of service. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-15 02:08:29 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2012205, 2011198, 2011638, 2011663, 2012185, 2012186, 2012187, 2012188, 2012189, 2012190, 2012191, 2012192, 2012193, 2012194, 2012195, 2012196, 2012204, 2012382, 2014264, 2015069, 2015236, 2015651, 2015866, 2015867
Bug Blocks:	2011061

Description Pedro Sampaio 2021-10-05 18:20:49 UTC

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.

References:

https://github.com/redis/redis/commit/5674b0057ff2903d43eaff802017eddf37c360f8
https://github.com/redis/redis/security/advisories/GHSA-f6pw-v9gw-v64p

Comment 5 errata-xmlrpc 2021-10-14 22:39:05 UTC

This issue has been addressed in the following products:

  Red Hat Advanced Cluster Management for Kubernetes 2.2 for RHEL 8
  Red Hat Advanced Cluster Management for Kubernetes 2.2 for RHEL 7

Via RHSA-2021:3873 https://access.redhat.com/errata/RHSA-2021:3873

Comment 6 Product Security DevOps Team 2021-10-15 02:08:29 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-32675

Comment 8 errata-xmlrpc 2021-10-19 13:39:52 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:3918 https://access.redhat.com/errata/RHSA-2021:3918

Comment 9 errata-xmlrpc 2021-10-20 03:55:23 UTC

This issue has been addressed in the following products:

  Red Hat Advanced Cluster Management for Kubernetes 2.3 for RHEL 8
  Red Hat Advanced Cluster Management for Kubernetes 2.3 for RHEL 7

Via RHSA-2021:3925 https://access.redhat.com/errata/RHSA-2021:3925

Comment 11 errata-xmlrpc 2021-10-20 13:51:35 UTC

This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS

Via RHSA-2021:3947 https://access.redhat.com/errata/RHSA-2021:3947

Comment 12 errata-xmlrpc 2021-10-20 13:53:43 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Extended Update Support

Via RHSA-2021:3944 https://access.redhat.com/errata/RHSA-2021:3944

Comment 13 errata-xmlrpc 2021-10-20 13:56:28 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.1 Extended Update Support

Via RHSA-2021:3946 https://access.redhat.com/errata/RHSA-2021:3946

Comment 14 errata-xmlrpc 2021-10-20 14:15:21 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:3945 https://access.redhat.com/errata/RHSA-2021:3945

Comment 15 errata-xmlrpc 2021-10-20 19:44:49 UTC

This issue has been addressed in the following products:

  Red Hat Advanced Cluster Management for Kubernetes 2.1 for RHEL 8
  Red Hat Advanced Cluster Management for Kubernetes 2.1 for RHEL 7

Via RHSA-2021:3949 https://access.redhat.com/errata/RHSA-2021:3949

Comment 16 errata-xmlrpc 2021-10-25 13:17:27 UTC

This issue has been addressed in the following products:

  Red Hat OpenStack Platform 10.0 (Newton)

Via RHSA-2021:3971 https://access.redhat.com/errata/RHSA-2021:3971

Comment 17 errata-xmlrpc 2021-10-25 17:56:22 UTC

This issue has been addressed in the following products:

  Red Hat OpenStack Platform 13.0 - ELS
  Red Hat OpenStack Platform 13.0 (Queens) for RHEL 7.6 EUS

Via RHSA-2021:3980 https://access.redhat.com/errata/RHSA-2021:3980

Comment 19 errata-xmlrpc 2021-11-11 18:32:37 UTC

This issue has been addressed in the following products:

  Red Hat Advanced Cluster Management for Kubernetes 2.4 for RHEL 8

Via RHSA-2021:4618 https://access.redhat.com/errata/RHSA-2021:4618