LibreOffice could be made to crash or run programs as your login if it opened a specially crafted EMF file.
It was discovered that LibreOffice incorrectly handled EMF image files. If a user were tricked into opening a specially crafted EMF image file, a remote attacker could cause LibreOffice to crash, and possibly execute arbitrary code.
2 May 2017
A security issue affects these releases of Ubuntu and its derivatives:
LibreOffice could be made to crash or run programs as your login if it opened a specially crafted EMF file.
It was discovered that LibreOffice incorrectly handled EMF image files. If a user were tricked into opening a specially crafted EMF image file, a remote attacker could cause LibreOffice to crash, and possibly execute arbitrary code.
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to restart LibreOffice to make all the necessary changes.