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Ubuntu Security Notice USN-1531-1

Ubuntu Security Notice USN-1531-1
Posted Aug 13, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1531-1 - An error was discovered in the Linux kernel's network TUN/TAP device implementation. A local user with access to the TUN/TAP interface (which is not available to unprivileged users until granted by a root user) could exploit this flaw to crash the system or potential gain administrative privileges. A flaw was found in the Linux kernel's Reliable Datagram Sockets (RDS) protocol implementation. A local, unprivileged user could use this flaw to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local, root, protocol
systems | linux, ubuntu
advisories | CVE-2012-2136, CVE-2012-2372, CVE-2012-2390, CVE-2012-2136, CVE-2012-2372, CVE-2012-2390
MD5 | 8b4dae4786f2ee8fc7cd5d2a4d254774

Ubuntu Security Notice USN-1531-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-1531-1
August 10, 2012

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

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

- Ubuntu 11.04

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

An error was discovered in the Linux kernel's network TUN/TAP device
implementation. A local user with access to the TUN/TAP interface (which is
not available to unprivileged users until granted by a root user) could
exploit this flaw to crash the system or potential gain administrative
privileges. (CVE-2012-2136)

A flaw was found in the Linux kernel's Reliable Datagram Sockets (RDS)
protocol implementation. A local, unprivileged user could use this flaw to
cause a denial of service. (CVE-2012-2372)

An error was discovered in the Linux kernel's memory subsystem (hugetlb).
An unprivileged local user could exploit this flaw to cause a denial of
service (crash the system). (CVE-2012-2390)

Update instructions:

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

Ubuntu 11.04:
linux-image-2.6.38-15-generic 2.6.38-15.65
linux-image-2.6.38-15-generic-pae 2.6.38-15.65
linux-image-2.6.38-15-omap 2.6.38-15.65
linux-image-2.6.38-15-powerpc 2.6.38-15.65
linux-image-2.6.38-15-powerpc-smp 2.6.38-15.65
linux-image-2.6.38-15-powerpc64-smp 2.6.38-15.65
linux-image-2.6.38-15-server 2.6.38-15.65
linux-image-2.6.38-15-versatile 2.6.38-15.65
linux-image-2.6.38-15-virtual 2.6.38-15.65

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

References:
http://www.ubuntu.com/usn/usn-1531-1
CVE-2012-2136, CVE-2012-2372, CVE-2012-2390

Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.38-15.65

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