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CVE-2015-8660

Published: 28 December 2015

The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel through 4.3.3 attempts to merge distinct setattr operations, which allows local users to bypass intended access restrictions and modify the attributes of arbitrary overlay files via a crafted application.

From the Ubuntu Security Team

Nathan Williams discovered that overlayfs in the Linux kernel incorrectly handled setattr operations. A local unprivileged attacker could use this to create files with administrative permission attributes and execute arbitrary code with elevated privileges.

Notes

AuthorNote
jdstrand
android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.10 and earlier preview kernels
linux-lts-saucy no longer receives official support
linux-lts-quantal no longer receives official support
sbeattie
kernel 3.16 and older not affected

Priority

High

Cvss 3 Severity Score

6.7

Score breakdown

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
vivid
Released (3.19.0-43.49)
wily
Released (4.2.0-23.28)
xenial Not vulnerable
(4.3.0-6.17)
yakkety Not vulnerable
(4.4.0-21.37)
upstream
Released (4.4~rc4)
precise Not vulnerable

trusty Not vulnerable

Patches:
Introduced by

e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c

Fixed by acff81ec2c79492b180fade3c2894425cd35a545
linux-armadaxp
Launchpad, Ubuntu, Debian
precise Not vulnerable

trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.4~rc4)
This package is not directly supported by the Ubuntu Security Team
linux-aws
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Not vulnerable
(4.4.0-1002.2)
xenial Not vulnerable
(4.4.0-1001.10)
yakkety Does not exist

upstream
Released (4.4~rc4)
linux-flo
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
vivid Ignored
(end of life)
wily Not vulnerable

xenial Not vulnerable

yakkety Not vulnerable

upstream
Released (4.4~rc4)
linux-fsl-imx51
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.4~rc4)
linux-gke
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Not vulnerable
(4.4.0-1003.3)
yakkety Does not exist

upstream
Released (4.4~rc4)
linux-goldfish
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
vivid Ignored
(end of life)
wily Not vulnerable

xenial Not vulnerable

yakkety Not vulnerable

upstream
Released (4.4~rc4)
linux-grouper
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.4~rc4)
linux-hwe
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Not vulnerable
(4.8.0-36.36~16.04.1)
yakkety Does not exist

upstream
Released (4.4~rc4)
linux-hwe-edge
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Not vulnerable
(4.8.0-36.36~16.04.1)
yakkety Does not exist

upstream
Released (4.4~rc4)
linux-linaro-omap
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.4~rc4)
linux-linaro-shared
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.4~rc4)
linux-linaro-vexpress
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.4~rc4)
linux-lts-quantal
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.4~rc4)
This package is not directly supported by the Ubuntu Security Team
linux-lts-raring
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.4~rc4)
linux-lts-saucy
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.4~rc4)
This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
precise Not vulnerable

trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.4~rc4)
linux-lts-utopic
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was not-affected)
vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.4~rc4)
linux-lts-vivid
Launchpad, Ubuntu, Debian
precise Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.4~rc4)
trusty
Released (3.19.0-43.49~14.04.1)
linux-lts-wily
Launchpad, Ubuntu, Debian
precise Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.4~rc4)
trusty
Released (4.2.0-23.28~14.04.1)
linux-lts-xenial
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Not vulnerable
(4.4.0-13.29~14.04.1)
vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.4~rc4)
linux-maguro
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.4~rc4)
linux-mako
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
vivid Ignored
(end of life)
wily Not vulnerable

xenial Not vulnerable

yakkety Not vulnerable

upstream
Released (4.4~rc4)
linux-manta
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
vivid Ignored
(end of life)
wily Not vulnerable

xenial Does not exist

yakkety Does not exist

upstream
Released (4.4~rc4)
linux-qcm-msm
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.4~rc4)
linux-raspi2
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

vivid Does not exist

wily
Released (4.2.0-1018.25)
xenial Not vulnerable
(4.4.0-1003.4)
yakkety Not vulnerable
(4.4.0-1009.10)
upstream
Released (4.4~rc4)
linux-snapdragon
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

wily Does not exist

xenial Not vulnerable
(4.4.0-1012.12)
yakkety Not vulnerable
(4.4.0-1012.12)
upstream
Released (4.4~rc4)
linux-ti-omap4
Launchpad, Ubuntu, Debian
precise Not vulnerable

trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

upstream
Released (4.4~rc4)

Severity score breakdown

Parameter Value
Base score 6.7
Attack vector Local
Attack complexity Low
Privileges required High
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H