Ubuntu Security Notice 2578-1 – Alexander Cherepanov discovered that LibreOffice incorrectly handled certain RTF files. If a user were tricked into opening a specially crafted RTF document, a remote attacker could cause LibreOffice to crash, and possibly execute arbitrary code. It was discovered that LibreOffice incorrectly handled certain HWP files. If a user were tricked into opening a specially crafted HWP document, a remote attacker could cause LibreOffice to crash, and possibly execute arbitrary code. Various other issues were also addressed.