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[USN-2491-1] Linux kernel (EC2) vulnerabilities

Posted on 04 February 2015
Ubuntu Security

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Ubuntu Security Notice USN-2491-1
February 04, 2015

linux-ec2 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-ec2: Linux kernel for EC2

Details:

Andy Lutomirski discovered that the Linux kernel does not properly handle=

faults associated with the Stack Segment (SS) register in the x86
architecture. A local attacker could exploit this flaw to gain
administrative privileges. (CVE-2014-9322)

Lars Bull reported a race condition in the PIT (programmable interrupt
timer) emulation in the KVM (Kernel Virtual Machine) subsystem of the Lin=
ux
kernel. A local guest user with access to PIT i/o ports could exploit thi=
s
flaw to cause a denial of service (crash) on the host. (CVE-2014-3611)

Lars Bull and Nadav Amit reported a flaw in how KVM (the Kernel Virtual
Machine) handles noncanonical writes to certain MSR registers. A privileg=
ed
guest user can exploit this flaw to cause a denial of service (kernel
panic) on the host. (CVE-2014-3610)

Andy Lutomirski discovered an information leak in the Linux kernel's Thre=
ad
Local Storage (TLS) implementation allowing users to bypass the espfix to=

obtain information that could be used to bypass the Address Space Layout
Randomization (ASLR) protection mechanism. A local user could exploit thi=
s
flaw to obtain potentially sensitive information from kernel memory.
(CVE-2014-8133)

Prasad J Pandit reported a flaw in the rock_continue function of the Linu=
x
kernel's ISO 9660 CDROM file system. A local user could exploit this flaw=

to cause a denial of service (system crash or hang). (CVE-2014-9420)

Update instructions:

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

Ubuntu 10.04 LTS:
linux-image-2.6.32-375-ec2 2.6.32-375.92

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-2491-1
CVE-2014-3610, CVE-2014-3611, CVE-2014-8133, CVE-2014-9322,
CVE-2014-9420

Package Information:
https://launchpad.net/ubuntu/+source/linux-ec2/2.6.32-375.92

 

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