Overly broad permissions can turn one compromised account into a much larger security problem. Learn how to reduce unnecessary access, review privileges, and apply least privilege across modern Linux systems. Review Linux Privileges×

Alerts This Week
Warning Icon 1 544
Alerts This Week
Warning Icon 1 544

Ubuntu 12.04 LTS USN-1812-1 Critical: Kernel Threats And Fixes

ubuntu
Calendar Grey May 1, 2013
Scroller Ubuntu
Securing Ubuntu 12.04 LTS involves regular kernel updates, employing strong passwords, using firewalls, reviewing logs, and upgrading to supported versions
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-lts-quantal: Linux hardware enablement kernel from Quantal

Details:

Mathias Krause discovered an information leak in the Linux kernel's UDF

file system implementation. A local user could exploit this flaw to examine

some of the kernel's heap memory. (CVE-2012-6548)

Mathias Krause discovered an information leak in the Linux kernel's ISO

9660 CDROM file system driver. A local user could exploit this flaw to

examine some of the kernel's heap memory. (CVE-2012-6549)

An integer overflow was discovered in the Direct Rendering Manager (DRM)

subsystem for the i915 video driver in the Linux kernel. A local user could

exploit this flaw to cause a denial of service (crash) or potentially

escalate privileges. (CVE-2013-0913)

Andrew Honig discovered a flaw in guest OS time updates in the Linux

kernel's KVM (Kernel-based Virtual Machine). A privileged guest user could

exploit this flaw to...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service information leak kernel update privilege escalation

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.5.0-28-generic    3.5.0-28.48~precise1

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-1812-1

CVE-2012-6548, CVE-2012-6549, CVE-2013-0913, CVE-2013-1796,

CVE-2013-1797, CVE-2013-1798, CVE-2013-1848, CVE-2013-1860,

CVE-2013-2634, CVE-2013-2635

Severity
critical
Lowest
Low
Medium
High
Critical

May 01, 2013

Topics%20covered

Topics Covered

security advisory denial of service information leak kernel update privilege escalation

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-quantal/3.5.0-28.48~precise1

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.