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CVE-2017-8824

Published: 5 December 2017

The dccp_disconnect function in net/dccp/proto.c in the Linux kernel through 4.14.3 allows local users to gain privileges or cause a denial of service (use-after-free) via an AF_UNSPEC connect system call during the DCCP_LISTEN state.

From the Ubuntu Security Team

Mohamed Ghannam discovered a use-after-free vulnerability in the DCCP protocol implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Mitigation

Blacklist the dccp ipv[46] autoloading aliases by adding the following
lines to /etc/modprobe.d/blacklist-dccp.conf:
  alias net-pf-2-proto-0-type-6 off
  alias net-pf-2-proto-33-type-6 off
  alias net-pf-10-proto-0-type-6 off
  alias net-pf-10-proto-33-type-6 off

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
artful
Released (4.13.0-36.40)
trusty
Released (3.13.0-142.191)
xenial
Released (4.4.0-116.140)
zesty Ignored
(end of life, was pending)
bionic Not vulnerable
(4.15.0-10.11)
upstream
Released (4.15~rc3)
Patches:
Introduced by

7c657876b63cb1d8a2ec06f8fc6c37bb8412e66c

Fixed by 69c64866ce072dea1d1e59a0d61e0f66c0dffb76
linux-armadaxp
Launchpad, Ubuntu, Debian
artful Does not exist

trusty Does not exist

xenial Does not exist

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc3)
This package is not directly supported by the Ubuntu Security Team
linux-flo
Launchpad, Ubuntu, Debian
artful Does not exist

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

bionic Does not exist

upstream
Released (4.15~rc3)
linux-lts-utopic
Launchpad, Ubuntu, Debian
artful Does not exist

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

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc3)
linux-lts-vivid
Launchpad, Ubuntu, Debian
artful Does not exist

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

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc3)
linux-lts-wily
Launchpad, Ubuntu, Debian
artful Does not exist

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

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc3)
linux-lts-xenial
Launchpad, Ubuntu, Debian
artful Does not exist

trusty
Released (4.4.0-116.140~14.04.1)
xenial Does not exist

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc3)
linux-manta
Launchpad, Ubuntu, Debian
artful Does not exist

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

zesty Does not exist

bionic Does not exist

upstream
Released (4.15~rc3)
linux-raspi2
Launchpad, Ubuntu, Debian
artful
Released (4.13.0-1014.15)
trusty Does not exist

xenial
Released (4.4.0-1085.93)
zesty Ignored
(end of life, was pending)
bionic Not vulnerable
(4.15.0-1006.7)
upstream
Released (4.15~rc3)
linux-snapdragon
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial
Released (4.4.0-1087.92)
zesty Ignored
(end of life)
artful
Released (4.4.0-1088.93)
bionic Not vulnerable

upstream
Released (4.15~rc3)
linux-aws
Launchpad, Ubuntu, Debian
artful Does not exist

trusty
Released (4.4.0-1014.14)
xenial
Released (4.4.0-1052.61)
zesty Does not exist

bionic Not vulnerable
(4.15.0-1001.1)
upstream
Released (4.15~rc3)
linux-azure
Launchpad, Ubuntu, Debian
artful Does not exist

trusty Not vulnerable
(4.15.0-1023.24~14.04.1)
xenial
Released (4.13.0-1011.14)
zesty Does not exist

bionic Not vulnerable
(4.15.0-1002.2)
upstream
Released (4.15~rc3)
linux-euclid
Launchpad, Ubuntu, Debian
artful Does not exist

trusty Does not exist

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

bionic Does not exist

upstream
Released (4.15~rc3)
linux-gcp
Launchpad, Ubuntu, Debian
artful Does not exist

trusty Does not exist

xenial
Released (4.13.0-1011.15)
zesty Does not exist

bionic Not vulnerable
(4.15.0-1001.1)
upstream
Released (4.15~rc3)
linux-gke
Launchpad, Ubuntu, Debian
artful Does not exist

trusty Does not exist

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

bionic Does not exist

upstream
Released (4.15~rc3)
linux-hwe
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Not vulnerable

upstream
Released (4.15~rc3)
trusty Does not exist

xenial
Released (4.13.0-36.40~16.04.1)
zesty Does not exist

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

upstream
Released (4.15~rc3)
artful Does not exist

trusty Does not exist

xenial Does not exist

zesty Does not exist

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

upstream
Released (4.15~rc3)
artful Does not exist

trusty Does not exist

xenial Does not exist

zesty Does not exist

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

upstream
Released (4.15~rc3)
artful Does not exist

trusty Does not exist

xenial Does not exist

zesty Does not exist

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

upstream
Released (4.15~rc3)
artful Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
xenial Ignored
(end of life, was needed)
zesty Ignored
(end of life)
linux-grouper
Launchpad, Ubuntu, Debian
bionic Does not exist

upstream
Released (4.15~rc3)
artful Does not exist

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

zesty Does not exist

linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-8.9~18.04.1)
upstream
Released (4.15~rc3)
artful Does not exist

trusty Does not exist

xenial
Released (4.13.0-36.40~16.04.1)
zesty Does not exist

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

upstream
Released (4.15~rc3)
artful Does not exist

trusty Does not exist

xenial Does not exist

zesty Does not exist

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

upstream
Released (4.15~rc3)
artful Does not exist

trusty Does not exist

xenial Does not exist

zesty Does not exist

This package is not directly supported by the Ubuntu Security Team
linux-kvm
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.2)
upstream
Released (4.15~rc3)
artful Does not exist

trusty Does not exist

xenial
Released (4.4.0-1019.24)
zesty Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1002.3)
upstream
Released (4.15~rc3)
artful Does not exist

trusty Does not exist

xenial
Released (4.13.0-1021.23)
zesty Does not exist

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

bionic Does not exist

trusty Does not exist

upstream
Released (4.15~rc3)
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~rc3)
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~rc3)
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~rc3)
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~rc3)
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~rc3)
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