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Ubuntu Security Notice USN-1170-1

Ubuntu Security Notice USN-1170-1
Posted Jul 16, 2011
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1170-1 - Dan Rosenberg discovered that multiple terminal ioctls did not correctly initialize structure memory. A local attacker could exploit this to read portions of kernel stack memory, leading to a loss of privacy. It was discovered that Xen did not correctly handle certain block requests. A local attacker in a Xen guest could cause the Xen host to use all available CPU resources, leading to a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2010-4076, CVE-2010-4077, CVE-2010-4247, CVE-2010-4526, CVE-2011-0726, CVE-2011-1163, CVE-2011-1577, CVE-2011-1745, CVE-2011-1746, CVE-2011-1747, CVE-2011-2022
MD5 | 909b3fb287fb01361d24f320d5126426

Ubuntu Security Notice USN-1170-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-1170-1
July 15, 2011

linux vulnerabilities
==========================================================================

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

- Ubuntu 8.04 LTS

Summary:

Multiple kernel flaws have been fixed.

Software Description:
- linux: Linux kernel

Details:

Dan Rosenberg discovered that multiple terminal ioctls did not correctly
initialize structure memory. A local attacker could exploit this to read
portions of kernel stack memory, leading to a loss of privacy.
(CVE-2010-4076, CVE-2010-4077)

It was discovered that Xen did not correctly handle certain block requests.
A local attacker in a Xen guest could cause the Xen host to use all
available CPU resources, leading to a denial of service. (CVE-2010-4247)

It was discovered that the ICMP stack did not correctly handle certain
unreachable messages. If a remote attacker were able to acquire a socket
lock, they could send specially crafted traffic that would crash the
system, leading to a denial of service. (CVE-2010-4526)

Kees Cook reported that /proc/pid/stat did not correctly filter certain
memory locations. A local attacker could determine the memory layout of
processes in an attempt to increase the chances of a successful memory
corruption exploit. (CVE-2011-0726)

Timo Warns discovered that OSF partition parsing routines did not correctly
clear memory. A local attacker with physical access could plug in a
specially crafted block device to read kernel memory, leading to a loss of
privacy. (CVE-2011-1163)

Timo Warns discovered that the GUID partition parsing routines did not
correctly validate certain structures. A local attacker with physical
access could plug in a specially crafted block device to crash the system,
leading to a denial of service. (CVE-2011-1577)

Vasiliy Kulikov discovered that the AGP driver did not check certain ioctl
values. A local attacker with access to the video subsystem could exploit
this to crash the system, leading to a denial of service, or possibly gain
root privileges. (CVE-2011-1745, CVE-2011-2022)

Vasiliy Kulikov discovered that the AGP driver did not check the size of
certain memory allocations. A local attacker with access to the video
subsystem could exploit this to run the system out of memory, leading to a
denial of service. (CVE-2011-1746, CVE-2011-1747)

Update instructions:

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

Ubuntu 8.04 LTS:
linux-image-2.6.24-29-386 2.6.24-29.91
linux-image-2.6.24-29-generic 2.6.24-29.91
linux-image-2.6.24-29-hppa32 2.6.24-29.91
linux-image-2.6.24-29-hppa64 2.6.24-29.91
linux-image-2.6.24-29-itanium 2.6.24-29.91
linux-image-2.6.24-29-lpia 2.6.24-29.91
linux-image-2.6.24-29-lpiacompat 2.6.24-29.91
linux-image-2.6.24-29-mckinley 2.6.24-29.91
linux-image-2.6.24-29-openvz 2.6.24-29.91
linux-image-2.6.24-29-powerpc 2.6.24-29.91
linux-image-2.6.24-29-powerpc-smp 2.6.24-29.91
linux-image-2.6.24-29-powerpc64-smp 2.6.24-29.91
linux-image-2.6.24-29-rt 2.6.24-29.91
linux-image-2.6.24-29-server 2.6.24-29.91
linux-image-2.6.24-29-sparc64 2.6.24-29.91
linux-image-2.6.24-29-sparc64-smp 2.6.24-29.91
linux-image-2.6.24-29-virtual 2.6.24-29.91
linux-image-2.6.24-29-xen 2.6.24-29.91

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

References:
http://www.ubuntu.com/usn/usn-1170-1
CVE-2010-4076, CVE-2010-4077, CVE-2010-4247, CVE-2010-4526,
CVE-2011-0726, CVE-2011-1163, CVE-2011-1577, CVE-2011-1745,
CVE-2011-1746, CVE-2011-1747, CVE-2011-2022

Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.24-29.91

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