Home / vulnerabilities Ubuntu Security Notice USN-2909-1
Posted on 23 February 2016
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==========================================================================Ubuntu Security Notice USN-2909-1
February 22, 2016
linux-lts-utopic 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-utopic: Linux hardware enablement kernel from Utopic
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'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)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 14.04 LTS:
linux-image-3.16.0-62-generic 3.16.0-62.82~14.04.1
linux-image-3.16.0-62-generic-lpae 3.16.0-62.82~14.04.1
linux-image-3.16.0-62-lowlatency 3.16.0-62.82~14.04.1
linux-image-3.16.0-62-powerpc-e500mc 3.16.0-62.82~14.04.1
linux-image-3.16.0-62-powerpc-smp 3.16.0-62.82~14.04.1
linux-image-3.16.0-62-powerpc64-emb 3.16.0-62.82~14.04.1
linux-image-3.16.0-62-powerpc64-smp 3.16.0-62.82~14.04.1
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-2909-1
CVE-2015-8785, CVE-2016-1575, CVE-2016-1576
Package Information:
https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-62.82~14.04.1
