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Ubuntu Security Notice USN-1127-1
May 02, 2011

usb-creator vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS

Summary:

An attacker could use usb-creator to unmount arbitrary disks or perform
other unauthorized disk operations.

Software Description:
- usb-creator: create a startup disk using a CD or disc image (common files)

Details:

Evan Broder discovered that usb-creator did not properly enforce
restrictions when performing privileged disk operations. A local attacker
could use this flaw to perform certain disk operations, such as unmount
arbitrary mountpoints.

Update instructions:

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

Ubuntu 11.04:
  usb-creator-common              0.2.28.3

Ubuntu 10.10:
  usb-creator-common              0.2.25.3

Ubuntu 10.04 LTS:
  usb-creator-common              0.2.22.3

In general, a standard system update will make all the necessary changes.

References:
  CVE-2011-1828

Package Information:
  https://launchpad.net/ubuntu/+source/usb-creator/0.2.28.3
  https://launchpad.net/ubuntu/+source/usb-creator/0.2.25.3
  https://launchpad.net/ubuntu/+source/usb-creator/0.2.22.3