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Ubuntu 12.04 LTS USN-2513-1 Critical Denial of Service Flaws

ubuntu
Calendar Grey February 26, 2015
Dist Ubuntu Esm H88
Ubuntu 12.04 LTS received critical updates addressing kernel security issues to prevent privilege escalations and DoS attacks.
Several security issues were fixed in the kernel.

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 guest

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 load

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 con...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory critical privilege escalation DoS Ubuntu kernel attack surface

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 automatically
perform this as well.

References

https://ubuntu.com/security/notices/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

Severity
critical
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Critical

February 26, 2015

Topics%20covered

Topics Covered

security advisory critical privilege escalation DoS Ubuntu kernel attack surface

Package Information

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

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