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Ubuntu Security Notice USN-2798-1

Ubuntu Security Notice USN-2798-1
Posted Nov 6, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2798-1 - 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. 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). Various other issues were also addressed.

tags | advisory, denial of service
systems | linux, ubuntu
advisories | CVE-2015-2925, CVE-2015-5257
SHA-256 | 6649cd17ec172a9028297c6a84efa56fd8d1bb0dd8b66dfd953dff08842d3201

Ubuntu Security Notice USN-2798-1

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==========================================================================Ubuntu Security Notice USN-2798-1
November 05, 2015

linux-lts-vivid 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-vivid: Linux hardware enablement kernel from Vivid

Details:

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 14.04 LTS:
linux-image-3.19.0-32-generic 3.19.0-32.37~14.04.1
linux-image-3.19.0-32-generic-lpae 3.19.0-32.37~14.04.1
linux-image-3.19.0-32-lowlatency 3.19.0-32.37~14.04.1
linux-image-3.19.0-32-powerpc-e500mc 3.19.0-32.37~14.04.1
linux-image-3.19.0-32-powerpc-smp 3.19.0-32.37~14.04.1
linux-image-3.19.0-32-powerpc64-emb 3.19.0-32.37~14.04.1
linux-image-3.19.0-32-powerpc64-smp 3.19.0-32.37~14.04.1

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. 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-2798-1
CVE-2015-2925, CVE-2015-5257

Package Information:
https://launchpad.net/ubuntu/+source/linux-lts-vivid/3.19.0-32.37~14.04.1
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