Otkriveno je nekoliko sigurnosnih ranjivosti u radu jezgre operacijskog sustava Linux. Zlonamjerni ih korisnici mogu iskoristiti za stjecanje većih ovlasti i izvođenje napada uskraćivanjem usluge (DoS).

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Ubuntu Security Notice USN-1201-1
September 13, 2011

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

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

- Ubuntu 10.10

Summary:

Multiple kernel flaws have been fixed.

Software Description:
- linux: Linux kernel

Details:

It was discovered that the /proc filesystem did not correctly handle
permission changes when programs executed. A local attacker could hold open
files to examine details about programs running with higher privileges,
potentially increasing the chances of exploiting additional
vulnerabilities. (CVE-2011-1020)

Dan Rosenberg discovered that the X.25 Rose network stack did not correctly
handle certain fields. If a system was running with Rose enabled, a remote
attacker could send specially crafted traffic to gain root privileges.
(CVE-2011-1493)

Dan Rosenberg discovered that the DCCP stack did not correctly handle
certain packet structures. A remote attacker could exploit this to crash
the system, leading to a denial of service. (CVE-2011-1770)

Vasiliy Kulikov discovered that taskstats listeners were not correctly
handled. A local attacker could expoit this to exhaust memory and CPU
resources, leading to a denial of service. (CVE-2011-2484)

It was discovered that Bluetooth l2cap and rfcomm did not correctly
initialize structures. A local attacker could exploit this to read portions
of the kernel stack, leading to a loss of privacy. (CVE-2011-2492)

Update instructions:

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

Ubuntu 10.10:
  linux-image-2.6.35-30-generic   2.6.35-30.59
  linux-image-2.6.35-30-generic-pae  2.6.35-30.59
  linux-image-2.6.35-30-omap      2.6.35-30.59
  linux-image-2.6.35-30-powerpc   2.6.35-30.59
  linux-image-2.6.35-30-powerpc-smp  2.6.35-30.59
  linux-image-2.6.35-30-powerpc64-smp  2.6.35-30.59
  linux-image-2.6.35-30-server    2.6.35-30.59
  linux-image-2.6.35-30-versatile  2.6.35-30.59
  linux-image-2.6.35-30-virtual   2.6.35-30.59

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

References:
  http://www.ubuntu.com/usn/usn-1201-1
  CVE-2011-1020, CVE-2011-1493, CVE-2011-1770, CVE-2011-2484,
  CVE-2011-2492

Package Information:
  https://launchpad.net/ubuntu/+source/linux/2.6.35-30.59