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Ubuntu Security Notice USN-1196-1
August 23, 2011

ecryptfs-utils vulnerability
==========================================================================

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 eCryptfs to unmount arbitrary locations and cause a
denial of service.

Software Description:
- ecryptfs-utils: ecryptfs cryptographic filesystem (utilities)

Details:

It was discovered that eCryptfs incorrectly handled permissions when
modifying the mtab file. A local attacker could use this flaw to manipulate
the mtab file, and possibly unmount arbitrary locations, leading to a
denial of service.

Update instructions:

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

Ubuntu 11.04:
  ecryptfs-utils                  87-0ubuntu1.2

Ubuntu 10.10:
  ecryptfs-utils                  83-0ubuntu3.2.10.10.2

Ubuntu 10.04 LTS:
  ecryptfs-utils                  83-0ubuntu3.2.10.04.2

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

References:
  http://www.ubuntu.com/usn/usn-1196-1
  CVE-2011-3145

Package Information:
  https://launchpad.net/ubuntu/+source/ecryptfs-utils/87-0ubuntu1.2
  https://launchpad.net/ubuntu/+source/ecryptfs-utils/83-0ubuntu3.2.10.10.2
  https://launchpad.net/ubuntu/+source/ecryptfs-utils/83-0ubuntu3.2.10.04.2