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CVE-2019-9503

Published: 12 April 2019

The Broadcom brcmfmac WiFi driver prior to commit a4176ec356c73a46c07c181c6d04039fafa34a9f is vulnerable to a frame validation bypass. If the brcmfmac driver receives a firmware event frame from a remote source, the is_wlc_event_frame function will cause this frame to be discarded and unprocessed. If the driver receives the firmware event frame from the host, the appropriate handler is called. This frame validation can be bypassed if the bus used is USB (for instance by a wifi dongle). This can allow firmware event frames from a remote source to be processed. In the worst case scenario, by sending specially-crafted WiFi packets, a remote, unauthenticated attacker may be able to execute arbitrary code on a vulnerable system. More typically, this vulnerability will result in denial-of-service conditions.

From the Ubuntu Security Team

Hugues Anguelkov discovered that the Broadcom Wifi driver in the Linux kernel did not properly prevent remote firmware events from being processed for USB Wifi devices. A physically proximate attacker could use this to send firmware events to the device.

Notes

AuthorNote
mdeslaur
this was originally called CVE-2019-8564 by mistake

Priority

Medium

Cvss 3 Severity Score

8.3

Score breakdown

Status

Package Release Status
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1039.41)
cosmic
Released (4.18.0-1016.18)
disco
Released (5.0.0-1006.6)
trusty Ignored
(was needed ESM criteria)
upstream
Released (5.1~rc1)
xenial
Released (4.4.0-1090.101)
linux-flo
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.1~rc1)
xenial Ignored
(abandoned)
linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (5.1~rc1)
xenial
Released (4.15.0-1039.41~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-1018.18~18.04.1)
cosmic
Released (4.18.0-1018.18)
disco
Released (5.0.0-1006.6)
trusty
Released (4.15.0-1045.49~14.04.1)
upstream
Released (5.1~rc1)
xenial
Released (4.15.0-1045.49)
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-50.54)
cosmic
Released (4.18.0-20.21)
disco
Released (5.0.0-15.16)
trusty Ignored
(was needed ESM criteria)
upstream
Released (5.1~rc1)
xenial
Released (4.4.0-157.185)
Patches:
Introduced by

5b435de0d786869c95d1962121af0d7df2542009

Fixed by a4176ec356c73a46c07c181c6d04039fafa34a9f
linux-azure-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-1018.18~18.04.1)
cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (5.1~rc1)
xenial
Released (4.15.0-1045.49)
linux-euclid
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (5.1~rc1)
xenial Ignored
(was needed ESM criteria)
linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1032.34)
cosmic
Released (4.18.0-1011.12)
disco
Released (5.0.0-1006.6)
trusty Does not exist

upstream
Released (5.1~rc1)
xenial
Released (4.15.0-1032.34~16.04.1)
linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-1011.12~18.04.1)
cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (5.1~rc1)
xenial Does not exist

linux-gke
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (5.1~rc1)
xenial Ignored
(end of standard support)
linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1032.34)
disco Does not exist

upstream
Released (5.1~rc1)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-1011.11~18.04.1)
disco Does not exist

upstream
Released (5.1~rc1)
xenial Does not exist

linux-goldfish
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.1~rc1)
xenial Ignored
(end of life)
linux-grouper
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.1~rc1)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-20.21~18.04.1)
cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (5.1~rc1)
xenial
Released (4.15.0-50.54~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-15.16~18.04.1)
cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (5.1~rc1)
xenial
Released (4.15.0-50.54~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1034.34)
cosmic
Released (4.18.0-1012.12)
disco
Released (5.0.0-1006.6)
trusty Does not exist

upstream
Released (5.1~rc1)
xenial
Released (4.4.0-1052.59)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist

upstream
Released (5.1~rc1)
xenial Does not exist

linux-lts-utopic
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Ignored
(end of life, was ignored)
upstream
Released (5.1~rc1)
xenial Does not exist

linux-lts-vivid
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Ignored
(end of life, was ignored)
upstream
Released (5.1~rc1)
xenial Does not exist

linux-lts-wily
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Ignored
(end of life, was ignored)
upstream
Released (5.1~rc1)
xenial Does not exist

linux-lts-xenial
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Ignored
(was needed ESM criteria)
upstream
Released (5.1~rc1)
xenial Does not exist

linux-maguro
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.1~rc1)
xenial Does not exist

linux-mako
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.1~rc1)
xenial Ignored
(abandoned)
linux-manta
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (5.1~rc1)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1038.43)
cosmic
Released (4.15.0-1038.43)
disco
Released (4.15.0-1038.43)
trusty Does not exist

upstream
Released (5.1~rc1)
xenial Ignored
(end of standard support, was needs-triage)
linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1013.15)
cosmic
Released (4.15.0-1013.15)
disco
Released (4.15.0-1013.15)
trusty Does not exist

upstream
Released (5.1~rc1)
xenial
Released (4.15.0-1013.15~16.04.1)
linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1036.38)
cosmic
Released (4.18.0-1014.16)
disco
Released (5.0.0-1008.8)
trusty Does not exist

upstream
Released (5.1~rc1)
xenial
Released (4.4.0-1117.126)
linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1053.57)
cosmic Does not exist

disco
Released (5.0.0-1012.12)
trusty Does not exist

upstream
Released (5.1~rc1)
xenial
Released (4.4.0-1121.127)

Severity score breakdown

Parameter Value
Base score 8.3
Attack vector Adjacent
Attack complexity High
Privileges required None
User interaction None
Scope Changed
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H