LWP::Protocol::file can open existent file from file:// scheme. However, current version of LWP uses open FILEHANDLE,EXPR and it has ability to execute arbitrary command

• https://github.com/libwww-perl/libwww-perl/pull/270

The Net::HTTPS module in libwww-perl (LWP) before 6.00, as used in WWW::Mechanize, LWP::UserAgent, and other products, when running in environments that do not set the If-SSL-Cert-Subject header, does not enable full validation of SSL certificates by default, which allows remote attackers to spoof servers via man-in-the-middle (MITM) attacks involving hostnames that are not properly validated.

• http://vttynotes.blogspot.com/2010/12/man-in-middle-fun-with-perl-lwp.html
• http://vttynotes.blogspot.com/2011/03/quick-note-on-lwp-and-perl-security-cve.html