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Ubuntu Security Notice USN-2792-1

Ubuntu Security Notice USN-2792-1
Posted Nov 6, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2792-1 - Dmitry Vyukov discovered that the Linux kernel did not properly initialize IPC object state in certain situations. A local attacker could use this to escalate their privileges, expose confidential information, or cause a denial of service (system crash). It was discovered that the Linux kernel did not check if a new IPv6 MTU set by a user space application was valid. A remote attacker could forge a route advertisement with an invalid MTU that a user space daemon like NetworkManager would honor and apply to the kernel, causing a denial of service. Various other issues were also addressed.

tags | advisory, remote, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2015-0272, CVE-2015-2925, CVE-2015-5257, CVE-2015-7613
SHA-256 | 9ff4283bbb732f6c23c7eb717c0f43455a871ded8bccdfef5307f089c2ff468a

Ubuntu Security Notice USN-2792-1

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Content-Disposition: inline

==========================================================================Ubuntu Security Notice USN-2792-1
November 05, 2015

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

- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

Dmitry Vyukov discovered that the Linux kernel did not properly initialize
IPC object state in certain situations. A local attacker could use this to
escalate their privileges, expose confidential information, or cause a
denial of service (system crash). (CVE-2015-7613)

It was discovered that the Linux kernel did not check if a new IPv6 MTU set
by a user space application was valid. A remote attacker could forge a
route advertisement with an invalid MTU that a user space daemon like
NetworkManager would honor and apply to the kernel, causing a denial of
service. (CVE-2015-0272)

It was discovered that in certain situations, a directory could be renamed
outside of a bind mounted location. An attacker could use this to escape
bind mount containment and gain access to sensitive information.
(CVE-2015-2925)

Moein Ghasemzadeh discovered that the USB WhiteHEAT serial driver contained
hardcoded attributes about the USB devices. An attacker could construct a
fake WhiteHEAT USB device that, when inserted, causes a denial of service
(system crash). (CVE-2015-5257)

Update instructions:

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

Ubuntu 12.04 LTS:
linux-image-3.2.0-93-generic 3.2.0-93.133
linux-image-3.2.0-93-generic-pae 3.2.0-93.133
linux-image-3.2.0-93-highbank 3.2.0-93.133
linux-image-3.2.0-93-omap 3.2.0-93.133
linux-image-3.2.0-93-powerpc-smp 3.2.0-93.133
linux-image-3.2.0-93-powerpc64-smp 3.2.0-93.133
linux-image-3.2.0-93-virtual 3.2.0-93.133

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. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References:
http://www.ubuntu.com/usn/usn-2792-1
CVE-2015-0272, CVE-2015-2925, CVE-2015-5257, CVE-2015-7613

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.2.0-93.133
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