Bug 1960498 (CVE-2020-26144)

Summary:	CVE-2020-26144 kernel: accepting unencrypted A-MSDU frames that start with RFC1042 header
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
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, blc, bmasney, brdeoliv, bskeggs, chwhite, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, ihuguet, jarod, jarodwilson, jeremy, jforbes, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, mark.esler, masami256, mchehab, mlangsdo, nmurray, ptalbert, qzhao, rvrbovsk, steved, swood, walters, wcosta, williams
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 kernel, where the WiFi implementations accept plaintext A-MSDU frames as long as the first 8 bytes correspond to a valid RFC1042 (ex., LLC/SNAP) header for EAPOL. The highest threat from this vulnerability is to integrity.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-09 20:52:53 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Bug Depends On:	1978181, 1960499, 1961958, 1961959, 1977757
Bug Blocks:	1959275

Description Dhananjay Arunesh 2021-05-14 03:43:58 UTC

A vulnerability was found in Linux Kernel, where the wifi implementations accept plaintext A-MSDU frames as long as the first 8 bytes correspond to a valid RFC1042 (i.e., LLC/SNAP) header for EAPOL.

upstream patch:
https://lore.kernel.org/linux-wireless/20210511180259.159598-1-johannes@sipsolutions.net/

Comment 1 Dhananjay Arunesh 2021-05-14 03:44:29 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1960499]

Comment 20 Íñigo Huguet 2021-08-12 09:55:46 UTC

As per the patches desciption and the vulnerability desciption in the paper, these patches seems to be addressing this vulnerability, despite only mentioning CVE-2020-24588:
2b8a1fee3488 cfg80211: mitigate A-MSDU aggregation attacks
62a8ff67eba5 ath10k: Validate first subframe of A-MSDU before processing the list
2c2bdd2372af mt76: validate rx A-MSDU subframes

Comment 22 errata-xmlrpc 2021-11-09 17:23:07 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:4140 https://access.redhat.com/errata/RHSA-2021:4140

Comment 23 errata-xmlrpc 2021-11-09 18:26:17 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:4356 https://access.redhat.com/errata/RHSA-2021:4356

Comment 24 Product Security DevOps Team 2021-11-09 20:52:48 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-2020-26144

Comment 25 Justin M. Forbes 2022-01-14 15:53:26 UTC

This was fixed for Fedora with the 5.12.9 stable kernel updates.

Comment 26 Mark Esler 2022-09-07 17:19:36 UTC

2b8a1fee3488 states:
> Note that for kernel 4.9 and above this patch depends on "mac80211:
> properly handle A-MSDUs that start with a rfc1042 header". Otherwise
> this patch has no impact and attacks will remain possible.

a1d5ff5651ea592c67054233b14b30bf4452999c mac80211: properly handle A-MSDUs that start with a rfc1042 header" is

Comment 27 Íñigo Huguet 2022-09-08 06:42:36 UTC

Double checking Mark's warning of dependency commit:
* it's pre v5.14 so already included in RHEL 9 since the fork point
* commit a1d5ff5651 included in RHEL 8.5, at the same time than the commits from comment 20, so there are not any version with the vulnerability.

Thanks Mark.