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Ubuntu 11.10: USN-1756-1 Critical: Kernel Security Flaws Found

ubuntu
Calendar Grey March 6, 2013
Scroller Ubuntu
Perform an update on your Ubuntu platform to address severe vulnerabilities in the kernel that could lead to denial of service situations and privilege escalation risks.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

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 gain guest OS privilege. (CVE-2013-0228)

A flaw was reported in the permission checks done by the Linux kernel for

/dev/cpu/*/msr. A local root user with all capabilities dropped could

exploit this f...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical privilege escalation kernel ubuntu

Update Instructions

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

Ubuntu 11.10:
  linux-image-3.0.0-32-generic    3.0.0-32.50
  linux-image-3.0.0-32-generic-pae  3.0.0-32.50
  linux-image-3.0.0-32-omap       3.0.0-32.50
  linux-image-3.0.0-32-powerpc    3.0.0-32.50
  linux-image-3.0.0-32-powerpc-smp  3.0.0-32.50
  linux-image-3.0.0-32-powerpc64-smp  3.0.0-32.50
  linux-image-3.0.0-32-server     3.0.0-32.50
  linux-image-3.0.0-32-virtual    3.0.0-32.50

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-1756-1

CVE-2013-0216, CVE-2013-0217, CVE-2013-0228, CVE-2013-0268,

CVE-2013-0311, CVE-2013-0349, CVE-2013-1773

Severity
critical
Lowest
Low
Medium
High
Critical

March 06, 2013

Topics%20covered

Topics Covered

security advisory denial of service critical privilege escalation kernel ubuntu

Package Information

https://launchpad.net/ubuntu/+source/linux/3.0.0-32.50

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