Pri radu jezgre (eng. kernel) operacijskog sustava Ubuntu 8.04 uočene su ranjivosti koje potencijalnim napadačima omogućuju otkrivanje osjetljivih informacija, povećanje ovlasti u sustavu te pokretanje napada uskraćivanja usluga.

==========================================================================
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