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Ubuntu Security Notice USN-2908-2

Ubuntu Security Notice USN-2908-2
Posted Feb 23, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2908-2 - halfdog discovered that OverlayFS, when mounting on top of a FUSE mount, incorrectly propagated file attributes, including setuid. A local unprivileged attacker could use this to gain privileges. halfdog discovered that OverlayFS in the Linux kernel incorrectly propagated security sensitive extended attributes, such as POSIX ACLs. A local unprivileged attacker could use this to gain privileges. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux, osx, ubuntu
advisories | CVE-2013-4312, CVE-2015-8785, CVE-2016-1575, CVE-2016-1576, CVE-2016-2069
SHA-256 | 3bd3447a7566b4ddafb9950b75297f97dfae5f898ad9d051beef16b3a2597662

Ubuntu Security Notice USN-2908-2

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Content-Disposition: inline

==========================================================================Ubuntu Security Notice USN-2908-2
February 22, 2016

linux-lts-wily vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux-lts-wily: Linux hardware enablement kernel from Wily

Details:

halfdog discovered that OverlayFS, when mounting on top of a FUSE mount,
incorrectly propagated file attributes, including setuid. A local
unprivileged attacker could use this to gain privileges. (CVE-2016-1576)

halfdog discovered that OverlayFS in the Linux kernel incorrectly
propagated security sensitive extended attributes, such as POSIX ACLs. A
local unprivileged attacker could use this to gain privileges.
(CVE-2016-1575)

It was discovered that the Linux kernel did not properly enforce rlimits
for file descriptors sent over UNIX domain sockets. A local attacker could
use this to cause a denial of service. (CVE-2013-4312)

It was discovered that the Linux kernel's Filesystem in Userspace (FUSE)
implementation did not handle initial zero length segments properly. A
local attacker could use this to cause a denial of service (unkillable
task). (CVE-2015-8785)

Andy Lutomirski discovered a race condition in the Linux kernel's
translation lookaside buffer (TLB) handling of flush events. A local
attacker could use this to cause a denial of service or possibly leak
sensitive information. (CVE-2016-2069)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 14.04 LTS:
linux-image-4.2.0-30-generic 4.2.0-30.35~14.04.1
linux-image-4.2.0-30-generic-lpae 4.2.0-30.35~14.04.1
linux-image-4.2.0-30-lowlatency 4.2.0-30.35~14.04.1
linux-image-4.2.0-30-powerpc-e500mc 4.2.0-30.35~14.04.1
linux-image-4.2.0-30-powerpc-smp 4.2.0-30.35~14.04.1
linux-image-4.2.0-30-powerpc64-emb 4.2.0-30.35~14.04.1
linux-image-4.2.0-30-powerpc64-smp 4.2.0-30.35~14.04.1

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References:
http://www.ubuntu.com/usn/usn-2908-2
http://www.ubuntu.com/usn/usn-2908-1
CVE-2013-4312, CVE-2015-8785, CVE-2016-1575, CVE-2016-1576,
CVE-2016-2069

Package Information:
https://launchpad.net/ubuntu/+source/linux-lts-wily/4.2.0-30.35~14.04.1
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