CVE-2018-1055: Remote arbitrary file disclosure vulnerability via
LibreOffice Calc supports a WEBSERVICE function to obtain data by URL.
Vulnerable versions of LibreOffice allow WEBSERVICE to take a local
file URL (e.g file://) which can be used to inject local files into the
spreadsheet without warning the user. Subsequent formulas can operate
on that inserted data and construct a remote URL whose path leaks the
local data to a remote attacker.
In later versions of LibreOffice without this flaw, WEBSERVICE has now
been limited to accessing http and https URLs along with bringing
WEBSERVICE URLs under LibreOffice Calc's link management
All users are recommended to upgrade to LibreOffice >= 5.4.5 or >=