Bug 1182623 – VUL-0: CVE-2021-27862: kernel-source: Bypass using 802.3 headers

Bug 1182623 - (CVE-2021-27862) VUL-0: CVE-2021-27862: kernel-source: Bypass using 802.3 headers

(CVE-2021-27862)
Summary:	VUL-0: CVE-2021-27862: kernel-source: Bypass using 802.3 headers

Status:	RESOLVED INVALID
Duplicates:	1203837 (view as bug list)

Classification:	Novell Products
Product:	SUSE Security Incidents
Classification:	Novell Products
Component:	Incidents
Version:	unspecified
Hardware:	Other Other

Priority:	P3 - Medium Severity: Normal
Target Milestone:	---
Assigned To:	Security Team bot
QA Contact:	Security Team bot

URL:	https://smash.suse.de/issue/343695/
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Reported:	2021-02-23 15:37 UTC by Alexandros Toptsoglou
Modified:	2023-03-09 10:03 UTC (History)
CC List:	9 users (show)

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Comment 13 Robert Frohl 2022-09-28 12:09:31 UTC

*** Bug 1203837 has been marked as a duplicate of this bug. ***

Comment 14 Robert Frohl 2022-09-28 12:10:00 UTC

CVE-2021-27862

Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed
using LLC/SNAP headers with invalid length and Ethernet to Wifi frame conversion
(and optionally VLAN0 headers).

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-27862
https://www.cve.org/CVERecord?id=CVE-2021-27862
https://standards.ieee.org/ieee/802.2/1048/
https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/

Comment 16 Takashi Iwai 2022-12-01 13:54:08 UTC

Denis, any progress on this bug?

Through a quick glance, it's not clear whether any relevant upstream fix is present -- or whether we would need any fix, above all, though...

Comment 17 Jan Kara 2023-01-09 14:56:52 UTC

As I'm reading comment 2, Linux is affected by this problem when it acts as a router between ethernet and WiFi. Not a common usecase of our product but perhaps possible. No sure if there are any fixes for this though... Denis can you have a look and tell us whether there's something to fix for us?

Comment 19 Robert Frohl 2023-03-09 10:02:43 UTC

configuration issue with the kernel that we will not fix, users should handle the problem by applying proper configuration to their systems.