[Bug 1511108] Re: Handle odd buffer lengths in checksum

[Launchpad Bug Tracker]

This bug was fixed in the package sbsigntool - 0.6-0ubuntu9

---------------
sbsigntool (0.6-0ubuntu9) xenial; urgency=medium

  [ Linn Crosetto ]
  * debian/patches/0001-Handle-odd-buffer-lengths-in-checksum.patch:
    Fix checksum when handling buffers of odd length.  LP: #1511108

 -- Michael Terry <mterry at ubuntu.com>  Thu, 19 Nov 2015 16:32:19 -0500

** Changed in: sbsigntool (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1511108

Title:
  Handle odd buffer lengths in checksum

Status in sbsigntool package in Ubuntu:
  Fix Released

Bug description:
  Buffers of odd length can be passed to the checksum, for example
  signatures. This results in reading 1 byte beyond the buffer and can
  produce an incorrect checksum if the extra byte is non-zero.

  Attaching a patch changing csum_bytes() to prevent overflowing the
  buffer, while taking the extra byte into account if the length is odd.
  Tested with a UEFI binary containing an odd-length signature, and also
  detach/attach on a binary signed with Microsoft signtool.

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