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[USN-2513-1] Linux kernel vulnerabilities

Posted on 26 February 2015
Ubuntu Security

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Ubuntu Security Notice USN-2513-1
February 26, 2015

linux vulnerabilities
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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 discovered in the Kernel Virtual Machine's (KVM) emulation of
the SYSTENTER instruction when the guest OS does not initialize the
SYSENTER MSRs. A guest OS user could exploit this flaw to cause a denial =
of
service of the guest OS (crash) or potentially gain privileges on the gue=
st
OS. (CVE-2015-0239)

A flaw was discovered in the automatic loading of modules in the crypto
subsystem of the Linux kernel. A local user could exploit this flaw to lo=
ad
installed kernel modules, increasing the attack surface and potentially
using this to gain administrative privileges. (CVE-2013-7421)

Andy Lutomirski discovered a flaw in how the Linux kernel handles
pivot_root when used with a chroot directory. A local user could exploit
this flaw to cause a denial of service (mount-tree loop). (CVE-2014-7970)=


A restriction bypass was discovered in iptables when conntrack rules are
specified and the conntrack protocol handler module is not loaded into th=
e
Linux kernel. This flaw can cause the firewall rules on the system to be
bypassed when conntrack rules are used. (CVE-2014-8160)

A race condition was discovered in the Linux kernel's key ring. A local
user could cause a denial of service (memory corruption or panic) or
possibly have unspecified impact via the keyctl commands. (CVE-2014-9529)=


A memory leak was discovered in the ISO 9660 CDROM file system when parsi=
ng
rock ridge ER records. A local user could exploit this flaw to obtain
sensitive information from kernel memory via a crafted iso9660 image.
(CVE-2014-9584)

A flaw was discovered in the Address Space Layout Randomization (ASLR) of=

the Virtual Dynamically linked Shared Objects (vDSO) location. This flaw
makes it easier for a local user to bypass the ASLR protection mechanism.=

(CVE-2014-9585)

A flaw was discovered in the crypto subsystem when screening module names=

for automatic module loading if the name contained a valid crypto module
name, eg. vfat(aes). A local user could exploit this flaw to load install=
ed
kernel modules, increasing the attack surface and potentially using this =
to
gain administrative privileges. (CVE-2014-9644)

Update instructions:

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

Ubuntu 12.04 LTS:
linux-image-3.2.0-77-generic 3.2.0-77.112
linux-image-3.2.0-77-generic-pae 3.2.0-77.112
linux-image-3.2.0-77-highbank 3.2.0-77.112
linux-image-3.2.0-77-omap 3.2.0-77.112
linux-image-3.2.0-77-powerpc-smp 3.2.0-77.112
linux-image-3.2.0-77-powerpc64-smp 3.2.0-77.112
linux-image-3.2.0-77-virtual 3.2.0-77.112

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-2513-1
CVE-2013-7421, CVE-2014-7970, CVE-2014-8160, CVE-2014-9529,
CVE-2014-9584, CVE-2014-9585, CVE-2014-9644, CVE-2015-0239

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.2.0-77.112

 

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