https://bugzilla.mindrot.org/show_bug.cgi?id=3693

--- Comment #4 from renmingshuai <[email protected]> ---
(In reply to Damien Miller from comment #3)
> I'm still not understanding. How is this an exploit? This looks like
> something the user has configured themselves.

This is really user configured themselves. The user write the expect
script to interact with the sftp. The direct cause of this problem is
that the expect script incorrectly matches the keyword from banner
message. Is the client allowed to provide an new option to allow user
to explicitly disable the display of banners from the server? This is
in accordance with section 5.4 of rfc4252. If it's allowed, I can
provide the new option.

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