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Ubuntu 10.04 LTS USN-1388-1 Critical: Linux Kernel EC2 Issues

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Calendar Grey March 6, 2012
Scroller Ubuntu
Ubuntu Security Notice USN-1388-1, released on March 06, 2012, addresses vulnerabilities in the Linux kernel for EC2 instances, ensuring improved security for users
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-ec2: Linux kernel for EC2

Details:

Paolo Bonzini discovered a flaw in Linux's handling of the SG_IO ioctl

command. A local user, or user in a VM could exploit this flaw to bypass

restrictions and gain read/write access to all data on the affected block

device. (CVE-2011-4127)

A flaw was found in KVM's Programmable Interval Timer (PIT). When a virtual

interrupt control is not available a local user could use this to cause a

denial of service by starting a timer. (CVE-2011-4622)

A flaw was discovered in the XFS filesystem. If a local user mounts a

specially crafted XFS image it could potential execute arbitrary code on

the system. (CVE-2012-0038)

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu linux kernel access bypass ec2

Update Instructions

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

Ubuntu 10.04 LTS:
  linux-image-2.6.32-343-ec2      2.6.32-343.45

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-1388-1

CVE-2011-4127, CVE-2011-4622, CVE-2012-0038

Severity
critical
Lowest
Low
Medium
High
Critical

March 06, 2012

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu linux kernel access bypass ec2

Package Information

https://launchpad.net/ubuntu/+source/linux-ec2/2.6.32-343.45

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