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Ubuntu 12.04 LTS USN-1767-1: Critical Kernel Issues and DoS Fixes

ubuntu
Calendar Grey March 18, 2013
Scroller Ubuntu
Numerous vulnerabilities addressed in Ubuntu 12.04 LTS via USN-1768-1 to improve overall system performance and dependability.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

Andrew Cooper of Citrix reported a Xen stack corruption in the Linux

kernel. An unprivileged user in a 32bit PVOPS guest can cause the guest

kernel to crash, or operate erroneously. (CVE-2013-0190)

A failure to validate input was discovered in the Linux kernel's Xen

netback (network backend) driver. A user in a guest OS may exploit this

flaw to cause a denial of service to the guest OS and other guest domains.

(CVE-2013-0216)

A memory leak was discovered in the Linux kernel's Xen netback (network

backend) driver. A user in a guest OS could trigger this flaw to cause a

denial of service on the system. (CVE-2013-0217)

Andrew Jones discovered a flaw with the xen_iret function in Linux kernel's

Xen virtualizeation. In the 32-bit Xen paravirt platform an unprivileged

guest OS user could exploit this flaw to cause a denial of service (crash

the system) or g...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory network security information leak DoS Ubuntu kernel crash

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.2.0-39-generic    3.2.0-39.62
  linux-image-3.2.0-39-generic-pae  3.2.0-39.62
  linux-image-3.2.0-39-highbank   3.2.0-39.62
  linux-image-3.2.0-39-omap       3.2.0-39.62
  linux-image-3.2.0-39-powerpc-smp  3.2.0-39.62
  linux-image-3.2.0-39-powerpc64-smp  3.2.0-39.62
  linux-image-3.2.0-39-virtual    3.2.0-39.62

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-1767-1

CVE-2013-0190, CVE-2013-0216, CVE-2013-0217, CVE-2013-0228,

CVE-2013-0231, CVE-2013-0268, CVE-2013-0311, CVE-2013-0313,

CVE-2013-0349, CVE-2013-1774

Severity
critical
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Critical

March 18, 2013

Topics%20covered

Topics Covered

security advisory network security information leak DoS Ubuntu kernel crash

Package Information

https://launchpad.net/ubuntu/+source/linux/3.2.0-39.62

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