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

CVE-2015-1774:
   It was discovered that missing input sanitising in Libreoffice's filter
   for HWP documents may result in the execution of arbitrary code if a
   malformed document is opened.

For the squeeze-backports distribution the problem has been fixed in
version 1:3.5.4+dfsg2-0deb7u4~bpo60+1.

For the wheezy-backports distribution the problem has been fixed in
version 1:4.3.3-2+deb8u1~bpo70+1.