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Ubuntu Security Notice USN-1448-1

Ubuntu Security Notice USN-1448-1
Posted May 22, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1448-1 - A flaw was found in the Linux kernel's KVM (Kernel Virtual Machine) virtual cpu setup. An unprivileged local user could exploit this flaw to crash the system leading to a denial of service. Steve Grubb reported a flaw with Linux fscaps (file system base capabilities) when used to increase the permissions of a process. For application on which fscaps are in use a local attacker can disable address space randomization to make attacking the process with raised privileges easier. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2012-1601, CVE-2012-2123, CVE-2012-1601, CVE-2012-2123
SHA-256 | 9eb4c8e14c0b23d7f2e789a0cc933a87ebbf7d4b85cda35ca1ad7bcc543dadf3

Ubuntu Security Notice USN-1448-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-1448-1
May 21, 2012

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

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

- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

A flaw was found in the Linux kernel's KVM (Kernel Virtual Machine) virtual
cpu setup. An unprivileged local user could exploit this flaw to crash the
system leading to a denial of service. (CVE-2012-1601)

Steve Grubb reported a flaw with Linux fscaps (file system base
capabilities) when used to increase the permissions of a process. For
application on which fscaps are in use a local attacker can disable address
space randomization to make attacking the process with raised privileges
easier. (CVE-2012-2123)

Update instructions:

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

Ubuntu 12.04 LTS:
linux-image-3.2.0-24-generic 3.2.0-24.38
linux-image-3.2.0-24-generic-pae 3.2.0-24.38
linux-image-3.2.0-24-omap 3.2.0-24.38
linux-image-3.2.0-24-powerpc-smp 3.2.0-24.38
linux-image-3.2.0-24-powerpc64-smp 3.2.0-24.38
linux-image-3.2.0-24-virtual 3.2.0-24.38

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:
http://www.ubuntu.com/usn/usn-1448-1
CVE-2012-1601, CVE-2012-2123

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.2.0-24.38
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