Bug 2000694 (CVE-2021-3772)

Summary:	CVE-2021-3772 kernel: sctp: Invalid chunks may be used to remotely remove existing associations
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, bhu, brdeoliv, bskeggs, carnil, chwhite, crwood, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarod, jarodwilson, jeremy, jforbes, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mleitner, nmurray, ptalbert, qzhao, rvrbovsk, security-response-team, steved, walters, williams, wmealing
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the Linux SCTP stack. A blind attacker may be able to kill an existing SCTP association through invalid chunks if the attacker knows the IP-addresses and port numbers being used and the attacker can send packets with spoofed IP addresses.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-05-11 08:45:58 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:	2001767, 2001768, 2002157, 2003494, 2003495
Bug Blocks:	2000695

Description Pedro Sampaio 2021-09-02 17:36:36 UTC

A flaw was found in the Linux SCTP stack. A blind attacker may be able to kill an existing SCTP association through invalid chunks if the attacker knows the IP-addresses and port numbers being used and the attacker can send packets with spoofed IP addresses.

Additional information:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=32f8807a48ae55be0e76880cfe8607a18b5bb0df

Comment 4 Wade Mealing 2021-09-08 06:38:41 UTC

At this time I don't see any upstream patches

Comment 5 Wade Mealing 2021-09-08 06:39:17 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2002157]

Comment 9 Wade Mealing 2021-09-13 02:54:11 UTC

At this time a patch is being developed and I don't know the upstream patch details or link, if someone drops it in here, I can put it in comment #0.

Thanks.

Comment 13 Salvatore Bonaccorso 2021-10-24 15:22:37 UTC

While going through some CVEs related for the Linux kernel I stumpled over CVE-2021-3772. Are the patches upstream? Is https://git.kernel.org/linus/a2d859e3fc97e79d907761550dbc03ff1b36479c related o this issue?

Comment 14 Wade Mealing 2021-10-27 04:26:50 UTC

I don't think it is.

Comment 15 Salvatore Bonaccorso 2021-10-28 21:28:35 UTC

In meanwhile in mainline the following appeared: https://git.kernel.org/linus/32f8807a48ae55be0e76880cfe8607a18b5bb0df

Comment 16 Wade Mealing 2021-11-02 07:00:48 UTC

I believe Carnil is correct. It appears that patchset solves the issue.

Comment 17 errata-xmlrpc 2022-05-10 14:39:41 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:1975 https://access.redhat.com/errata/RHSA-2022:1975

Comment 18 errata-xmlrpc 2022-05-10 14:45:25 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:1988 https://access.redhat.com/errata/RHSA-2022:1988

Comment 19 Product Security DevOps Team 2022-05-11 08:45:56 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-2021-3772