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Ubuntu Security Notice USN-2466-1

Ubuntu Security Notice USN-2466-1
Posted Jan 13, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2466-1 - A null pointer dereference flaw was discovered in the the Linux kernel's SCTP implementation when ASCONF is used. A remote attacker could exploit this flaw to cause a denial of service (system crash) via a malformed INIT chunk. A race condition with MMIO and PIO transactions in the KVM (Kernel Virtual Machine) subsystem of the Linux kernel was discovered. A guest OS user could exploit this flaw to cause a denial of service (guest OS crash) via a specially crafted application. Various other issues were also addressed.

tags | advisory, remote, denial of service, kernel
systems | linux, ubuntu
advisories | CVE-2014-7841, CVE-2014-7842, CVE-2014-7843, CVE-2014-8884
SHA-256 | 72ab799039264b012fe56154c3779f8c3a2e0239f77320cbea5170fef033aff4

Ubuntu Security Notice USN-2466-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-2466-1
January 13, 2015

linux 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: Linux kernel

Details:

A null pointer dereference flaw was discovered in the the Linux kernel's
SCTP implementation when ASCONF is used. A remote attacker could exploit
this flaw to cause a denial of service (system crash) via a malformed INIT
chunk. (CVE-2014-7841)

A race condition with MMIO and PIO transactions in the KVM (Kernel Virtual
Machine) subsystem of the Linux kernel was discovered. A guest OS user
could exploit this flaw to cause a denial of service (guest OS crash) via a
specially crafted application. (CVE-2014-7842)

Milo=C5=A1 Prchl=C3=ADk reported a flaw in how the ARM64 platform handles a single
byte overflow in __clear_user. A local user could exploit this flaw to
cause a denial of service (system crash) by reading one byte beyond a
/dev/zero page boundary. (CVE-2014-7843)

A stack buffer overflow was discovered in the ioctl command handling for
the Technotrend/Hauppauge USB DEC devices driver. A local user could
exploit this flaw to cause a denial of service (system crash) or possibly
gain privileges. (CVE-2014-8884)

Update instructions:

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

Ubuntu 14.04 LTS:
linux-image-3.13.0-44-generic 3.13.0-44.73
linux-image-3.13.0-44-generic-lpae 3.13.0-44.73
linux-image-3.13.0-44-lowlatency 3.13.0-44.73
linux-image-3.13.0-44-powerpc-e500 3.13.0-44.73
linux-image-3.13.0-44-powerpc-e500mc 3.13.0-44.73
linux-image-3.13.0-44-powerpc-smp 3.13.0-44.73
linux-image-3.13.0-44-powerpc64-emb 3.13.0-44.73
linux-image-3.13.0-44-powerpc64-smp 3.13.0-44.73

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-2466-1
CVE-2014-7841, CVE-2014-7842, CVE-2014-7843, CVE-2014-8884

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.13.0-44.73
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