[issue36021] [Security][Windows] webbrowser: WindowsDefault uses os.startfile() and so can be abused to run arbitrary commands

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

Maybe webbrowser must be changed to become *very strict*. For example, raise an error if the URL doesn't start with "http://" or "https://". But add an option to opt-in for "unsafe" URLs with a warning in the doc to explain the risk on Windows?

Another option is to add an optional callback to validate the URL. As the 'verify' parameter of logging.config.listen():
https://docs.python.org/dev/library/logging.config.html#logging.config.listen

"pydoc -b" runs a local HTTP server but it uses regular "http://" URLs, it doesn't use file://.

Maybe only Windows should be modified, Unix is safe, no?

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<https://bugs.python.org/issue36021>
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