[Bug 1263740] Re: 12.04.4 alternate installer encryption should default to aes-xts-plain64

[Dimitri John Ledkov]

** Bug watch added: Debian Bug tracker #482092
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=482092

** Also affects: partman-crypto (Debian) via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=482092
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1263740

Title:
  12.04.4 alternate installer encryption should default to aes-xts-
  plain64

Status in “partman-crypto” package in Ubuntu:
  Fix Released
Status in “partman-crypto” source package in Precise:
  In Progress
Status in “partman-crypto” package in Debian:
  Unknown

Bug description:
  [Impact]

   * Default LUKS encryption settings in the installer are proven to be susceptible to a malleability attack (targeted manipulation of encrypted data).
   * Thus it is proposed to bump defaults to aes-xts-plain64 which is believe to not be affected by above attack.

  [Test Case]

   * Perform LUKS encrypted installation using d-i (text) based interface
   * After installation verity that XTS has been used, and not CBC.

  Here is the sample of _bad_ (CBC) output:

  # cryptsetup luksDump /dev/sda5|grep Cipher
  Cipher name:    aes
  Cipher mode:    cbc-essiv:sha256

  [Regression Potential]

   *

  [Other Info]

  12.04 LUKS encryption in the installer defaulted to CBC. We should
  switch 12.04.4 to aes-xts-plain64 as in 12.10 and above.

  See:
  http://www.jakoblell.com/blog/2013/12/22/practical-malleability-attack-against-cbc-encrypted-luks-partitions/

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