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[USN-1775-1] Linux kernel vulnerabilities

Posted on 23 March 2013
Ubuntu Security

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Ubuntu Security Notice USN-1775-1
March 22, 2013

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

- Ubuntu 10.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

A flaw was reported in the permission checks done by the Linux kernel for=

/dev/cpu/*/msr. A local root user with all capabilities dropped could
exploit this flaw to execute code with full root capabilities.
(CVE-2013-0268)

A flaw was discovered in the Linux kernels handling of memory ranges with=

PROT_NONE when transparent hugepages are in use. An unprivileged local us=
er
could exploit this flaw to cause a denial of service (crash the system).
(CVE-2013-0309)

A flaw was discovered on the Linux kernel's VFAT filesystem driver when a=

disk is mounted with the utf8 option (this is the default on Ubuntu). On =
a
system where disks/images can be auto-mounted or a FAT filesystem is
mounted an unprivileged user can exploit the flaw to gain root privileges=
=2E
(CVE-2013-1773)

Update instructions:

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

Ubuntu 10.04 LTS:
linux-image-2.6.32-46-386 2.6.32-46.105
linux-image-2.6.32-46-generic 2.6.32-46.105
linux-image-2.6.32-46-generic-pae 2.6.32-46.105
linux-image-2.6.32-46-ia64 2.6.32-46.105
linux-image-2.6.32-46-lpia 2.6.32-46.105
linux-image-2.6.32-46-powerpc 2.6.32-46.105
linux-image-2.6.32-46-powerpc-smp 2.6.32-46.105
linux-image-2.6.32-46-powerpc64-smp 2.6.32-46.105
linux-image-2.6.32-46-preempt 2.6.32-46.105
linux-image-2.6.32-46-server 2.6.32-46.105
linux-image-2.6.32-46-sparc64 2.6.32-46.105
linux-image-2.6.32-46-sparc64-smp 2.6.32-46.105
linux-image-2.6.32-46-versatile 2.6.32-46.105
linux-image-2.6.32-46-virtual 2.6.32-46.105

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 automaticall=
y
perform this as well.

References:
http://www.ubuntu.com/usn/usn-1775-1
CVE-2013-0268, CVE-2013-0309, CVE-2013-1773

Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.32-46.105


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