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CVE-2017-17806

Published: 20 December 2017

The HMAC implementation (crypto/hmac.c) in the Linux kernel before 4.14.8 does not validate that the underlying cryptographic hash algorithm is unkeyed, allowing a local attacker able to use the AF_ALG-based hash interface (CONFIG_CRYPTO_USER_API_HASH) and the SHA-3 hash algorithm (CONFIG_CRYPTO_SHA3) to cause a kernel stack buffer overflow by executing a crafted sequence of system calls that encounter a missing SHA-3 initialization.

From the Ubuntu Security Team

It was discovered that the HMAC implementation did not validate the state of the underlying cryptographic hash algorithm. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
linux-aws
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1001.1)
upstream
Released (4.15~rc4)
zesty Does not exist

artful Does not exist

trusty
Released (4.4.0-1016.16)
xenial
Released (4.4.0-1054.63)
linux-azure
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.2)
upstream
Released (4.15~rc4)
artful Does not exist

trusty Not vulnerable
(4.15.0-1023.24~14.04.1)
xenial
Released (4.13.0-1014.17)
zesty Does not exist

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

upstream
Released (4.15~rc4)
artful Does not exist

trusty Does not exist

xenial Ignored
(was needed ESM criteria)
zesty Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1001.1)
upstream
Released (4.15~rc4)
artful Does not exist

trusty Does not exist

xenial
Released (4.13.0-1012.16)
zesty Does not exist

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

upstream
Released (4.15~rc4)
artful Does not exist

trusty Does not exist

xenial Ignored
(end of standard support, was needed)
zesty Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic Not vulnerable

upstream
Released (4.15~rc4)
artful Does not exist

trusty Does not exist

xenial
Released (4.13.0-38.43~16.04.1)
zesty Does not exist

linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-8.9~18.04.1)
upstream
Released (4.15~rc4)
artful Does not exist

trusty Does not exist

xenial
Released (4.13.0-38.43~16.04.1)
zesty Does not exist

linux-kvm
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.2)
upstream
Released (4.15~rc4)
artful Does not exist

trusty Does not exist

xenial
Released (4.4.0-1020.25)
zesty Does not exist

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

upstream
Released (4.15~rc4)
artful Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
xenial Does not exist

zesty Does not exist

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

upstream
Released (4.15~rc4)
artful Does not exist

trusty Ignored
(end of life, was needs-triage)
xenial Does not exist

zesty Does not exist

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

upstream
Released (4.15~rc4)
artful Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
xenial Does not exist

zesty Does not exist

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

upstream
Released (4.15~rc4)
artful Does not exist

trusty
Released (4.4.0-119.143~14.04.1)
xenial Does not exist

zesty Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.3)
upstream
Released (4.15~rc4)
artful Does not exist

trusty Does not exist

xenial
Released (4.13.0-1022.24)
zesty Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1006.7)
upstream
Released (4.15~rc4)
artful
Released (4.13.0-1016.17)
trusty Does not exist

xenial
Released (4.4.0-1086.94)
zesty Ignored
(end of life)
linux-snapdragon
Launchpad, Ubuntu, Debian
bionic Not vulnerable

artful
Released (4.4.0-1088.93)
trusty Does not exist

upstream
Released (4.15~rc4)
xenial
Released (4.4.0-1088.93)
zesty Ignored
(end of life)
linux-armadaxp
Launchpad, Ubuntu, Debian
zesty Does not exist

artful Does not exist

bionic Does not exist

trusty Does not exist

upstream
Released (4.15~rc4)
xenial Does not exist

This package is not directly supported by the Ubuntu Security Team
linux
Launchpad, Ubuntu, Debian
artful
Released (4.13.0-38.43)
bionic Not vulnerable
(4.15.0-10.11)
trusty
Released (3.13.0-142.191)
upstream
Released (4.15~rc4)
xenial
Released (4.4.0-119.143)
zesty Ignored
(end of life)
Patches:
Introduced by

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2

Fixed by af3ff8045bbf3e32f1a448542e73abb4c8ceb6f1
linux-flo
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.15~rc4)
xenial Ignored
(abandoned)
zesty Does not exist

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

bionic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.15~rc4)
xenial Ignored
(end of life, was needed)
zesty Ignored
(end of life)
linux-grouper
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.15~rc4)
xenial Does not exist

zesty Does not exist

linux-linaro-omap
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

trusty Does not exist

upstream
Released (4.15~rc4)
xenial Does not exist

zesty Does not exist

linux-linaro-shared
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

trusty Does not exist

upstream
Released (4.15~rc4)
xenial Does not exist

zesty Does not exist

linux-linaro-vexpress
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

trusty Does not exist

upstream
Released (4.15~rc4)
xenial Does not exist

zesty Does not exist

linux-lts-quantal
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

trusty Does not exist

upstream
Released (4.15~rc4)
xenial Does not exist

zesty Does not exist

This package is not directly supported by the Ubuntu Security Team
linux-lts-raring
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

trusty Does not exist

upstream
Released (4.15~rc4)
xenial Does not exist

zesty Does not exist

linux-lts-saucy
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

trusty Does not exist

upstream
Released (4.15~rc4)
xenial Does not exist

zesty Does not exist

This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

trusty Does not exist

upstream
Released (4.15~rc4)
xenial Does not exist

zesty Does not exist

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

bionic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.15~rc4)
xenial Does not exist

zesty Does not exist

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

bionic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.15~rc4)
xenial Ignored
(abandoned)
zesty Does not exist

linux-manta
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.15~rc4)
xenial Does not exist

zesty Does not exist

linux-qcm-msm
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

trusty Does not exist

upstream
Released (4.15~rc4)
xenial Does not exist

zesty Does not exist

linux-ti-omap4
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

trusty Does not exist

upstream
Released (4.15~rc4)
xenial Does not exist

zesty Does not exist

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H