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Ubuntu: New Linux packages fix security vulnerabilities

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. 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. 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.

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. 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.

Updated packages are available from security.ubuntu.com.

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