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CVE-2017-17805

Published: 20 December 2017

The Salsa20 encryption algorithm in the Linux kernel before 4.14.8 does not correctly handle zero-length inputs, allowing a local attacker able to use the AF_ALG-based skcipher interface (CONFIG_CRYPTO_USER_API_SKCIPHER) to cause a denial of service (uninitialized-memory free and kernel crash) or have unspecified other impact by executing a crafted sequence of system calls that use the blkcipher_walk API. Both the generic implementation (crypto/salsa20_generic.c) and x86 implementation (arch/x86/crypto/salsa20_glue.c) of Salsa20 were vulnerable.

From the Ubuntu Security Team

It was discovered that the Salsa20 encryption algorithm implementations in the Linux kernel did not properly handle zero-length inputs. A local attacker could use this to cause a denial of service (system crash).

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)
artful Does not exist

trusty
Released (4.4.0-1016.16)
xenial
Released (4.4.0-1054.63)
zesty Does not exist

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-flo
Launchpad, Ubuntu, Debian
bionic Does not exist

upstream
Released (4.15~rc4)
artful Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
xenial Ignored
(abandoned)
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-manta
Launchpad, Ubuntu, Debian
bionic Does not exist

upstream
Released (4.15~rc4)
artful Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
xenial Does not exist

zesty Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.3)
artful Does not exist

trusty Does not exist

upstream
Released (4.15~rc4)
xenial
Released (4.13.0-1022.24)
zesty Does not exist

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
Launchpad, Ubuntu, Debian
artful
Released (4.13.0-38.43)
bionic Not vulnerable
(4.15.0-10.11)
trusty
Released (3.13.0-144.193)
upstream
Released (4.15~rc4)
xenial
Released (4.4.0-119.143)
zesty Ignored
(end of life)
Patches:
Introduced by

eb6f13eb9f812f5812ed5d14f241309da369dee6

Fixed by ecaaab5649781c5a0effdaf298a925063020500e
linux-armadaxp
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-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-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-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-raspi2
Launchpad, Ubuntu, Debian
artful
Released (4.13.0-1016.17)
bionic Not vulnerable
(4.15.0-1006.7)
trusty Does not exist

upstream
Released (4.15~rc4)
xenial
Released (4.4.0-1086.94)
zesty Ignored
(end of life)
linux-snapdragon
Launchpad, Ubuntu, Debian
artful
Released (4.4.0-1088.93)
bionic Not vulnerable

trusty Does not exist

upstream
Released (4.15~rc4)
xenial
Released (4.4.0-1088.93)
zesty Ignored
(end of life)
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