CVE-2014-8989
Published: 29 November 2014
The Linux kernel through 3.17.4 does not properly restrict dropping of supplemental group memberships in certain namespace scenarios, which allows local users to bypass intended file permissions by leveraging a POSIX ACL containing an entry for the group category that is more restrictive than the entry for the other category, aka a "negative groups" issue, related to kernel/groups.c, kernel/uid16.c, and kernel/user_namespace.c.
From the Ubuntu security team
A flaw was discovered in how supplemental group memberships are handled in certain namespace scenarios. A local user could exploit this flaw to bypass file permission restrictions.
Status
Package | Release | Status |
---|---|---|
linux Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
Patches: Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 |
||
linux-armadaxp Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
This package is not directly supported by the Ubuntu Security Team | ||
linux-aws Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-ec2 Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-flo Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-fsl-imx51 Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-gke Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-goldfish Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-grouper Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-hwe Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-hwe-edge Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-linaro-omap Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-linaro-shared Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-linaro-vexpress Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-lts-quantal Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
This package is not directly supported by the Ubuntu Security Team | ||
linux-lts-raring Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-lts-saucy Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
This package is not directly supported by the Ubuntu Security Team | ||
linux-lts-trusty Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-lts-utopic Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-lts-vivid Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-lts-wily Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-lts-xenial Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-maguro Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-mako Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-manta Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-mvl-dove Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-qcm-msm Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-raspi2 Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-snapdragon Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
linux-ti-omap4 Launchpad, Ubuntu, Debian |
upstream |
Released
(3.19~rc1)
|
Notes
Author | Note |
---|---|
jdstrand | android kernels (flo, goldfish, grouper, maguro, mako and manta) are not supported on the Ubuntu Touch 14.04 preview kernels linux-lts-saucy no longer receives official support linux-lts-quantal no longer receives official support |
sbeattie | for precise/3.2 kernel, prio is low, due to lack of support for unprivileged user namespaces |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-8989
- http://thread.gmane.org/gmane.linux.man/7385/
- https://ubuntu.com/security/notices/USN-2515-1
- https://ubuntu.com/security/notices/USN-2516-1
- https://ubuntu.com/security/notices/USN-2517-1
- https://ubuntu.com/security/notices/USN-2518-1
- http://www.openwall.com/lists/oss-security/2014/11/20/4
- NVD
- Launchpad
- Debian