[tdf-discuss] security related information, CVE-2021-25631

tl;dr: Windows users should upgrade to 7.0.5 or 7.1.2

LibreOffice has a feature where hyperlinks in a document can be
activated by CTRL+click. Under Windows the link can be passed to the
system ShellExecute function for handling. LibreOffice contains a
denylist of extensions that it blocks from passing to ShellExecute to
avoid attempting to launch executables.

In the LibreOffice 7-1 series in versions prior to 7.1.2, and in the 7-
0 series in versions prior to 7.0.5, the denylist can be circumvented
by manipulating the link so it doesn't match the denylist but results
in ShellExecute attempting to launch an executable type.

In the fixed versions this circumvention has been blocked.

Thanks to Lukas Euler of Positive Security for discovering and
reporting this issue


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