Rene Engelhard uploaded new packages for libreoffice which fixed the
following security problems:

  Red Hat, Inc. security researcher Huzaifa Sidhpurwala reported multiple
  vulnerabilities in the binary Microsoft Word (doc) file format importer
  of, a full-featured office productivity suite that
  provides a near drop-in replacement for Microsoft(R) Office.

For the squeeze-backports distribution the problems have been fixed in
version 1:3.4.3-3~bpo60+1.