Bug 1960498 (CVE-2020-26144) - CVE-2020-26144 kernel: accepting unencrypted A-MSDU frames that start with RFC1042 header
Summary: CVE-2020-26144 kernel: accepting unencrypted A-MSDU frames that start with RF...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-26144
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1978181 1960499 1961958 1961959 1977757
Blocks: 1959275
TreeView+ depends on / blocked
 
Reported: 2021-05-14 03:43 UTC by Dhananjay Arunesh
Modified: 2022-09-08 06:42 UTC (History)
45 users (show)

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.
Clone Of:
Environment:
Last Closed: 2021-11-09 20:52:53 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2021:4140 0 None None None 2021-11-09 17:23:10 UTC
Red Hat Product Errata RHSA-2021:4356 0 None None None 2021-11-09 18:26:21 UTC

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.
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