USN-1651-1: Linux kernel vulnerability

Ubuntu Security Notice USN-1651-1

30th November, 2012

linux vulnerability

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

  • Ubuntu 10.04 LTS

Summary

The system could be made to crash under certain conditions.

Software description

  • linux - Linux kernel

Details


Rodrigo Freire discovered a flaw in the Linux kernel's TCP illinois
congestion control algorithm. A local attacker could use this to cause a
denial of service. (CVE-2012-4565)

Mathias Krause discovered an information leak in the Linux kernel's TUN/TAP
device driver. A local user could exploit this flaw to examine part of the
kernel's stack memory. (CVE-2012-6547)

A flaw was found in Linux kernel's validation of CIPSO (Common IP Security
Option) options set from userspace. A local user that can set a socket's
CIPSO options could exploit this flaw to cause a denial of service (crash
the system). (CVE-2013-0310)

Mathias Krause discover an error in Linux kernel's Datagram Congestion
Control Protocol (DCCP) Congestion Control Identifier (CCID) use. A local
attack could exploit this flaw to cause a denial of service (crash) and
potentially escalate privileges if the user can mmap page 0.
(CVE-2013-1827)

Update instructions

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

Ubuntu 10.04 LTS:
linux-image-2.6.32-45-generic 2.6.32-45.100
linux-image-2.6.32-45-powerpc-smp 2.6.32-45.100
linux-image-2.6.32-45-ia64 2.6.32-45.100
linux-image-2.6.32-45-lpia 2.6.32-45.100
linux-image-2.6.32-45-preempt 2.6.32-45.100
linux-image-2.6.32-45-sparc64-smp 2.6.32-45.100
linux-image-2.6.32-45-virtual 2.6.32-45.100
linux-image-2.6.32-45-sparc64 2.6.32-45.100
linux-image-2.6.32-45-generic-pae 2.6.32-45.100
linux-image-2.6.32-45-server 2.6.32-45.100
linux-image-2.6.32-45-powerpc 2.6.32-45.100
linux-image-2.6.32-45-386 2.6.32-45.100
linux-image-2.6.32-45-powerpc64-smp 2.6.32-45.100
linux-image-2.6.32-45-versatile 2.6.32-45.100

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.

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

CVE-2012-4565, CVE-2012-6547, CVE-2013-0310, CVE-2013-1827