The remote Debian host is missing a security-related update.
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.
Upgrade the libreoffice packages. For the oldstable distribution (wheezy), this problem has been fixed in version 1:3.5.4+dfsg2-0+deb7u4. For the stable distribution (jessie), this problem has been fixed in version 1:4.3.3-2+deb8u1.