USN-1170-1: Linux kernel vulnerabilities

15 July 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)

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

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References