Windows-only. The information disclosure is Windows automatically opening
an SMB connection and sending the user's NTLM credentials when a document
references file://<host>/<share> (e.g. xlink:href in an .odt). On Linux,
LibreOffice does not reach SMB for such URLs and there is no automatic
NTLM authentication, so nothing is disclosed. Upstream additionally
restricted such accesses to trusted locations. Debian marks this issue
unimportant ("generic behaviour of accessing remote SMB shares").
https://security-tracker.debian.org/tracker/CVE-2018-10583