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pip before 1.3 uses HTTP to retrieve packages from the PyPI repository, and does not perform integrity checks on package contents, which allows man-in-the-middle attackers to execute arbitrary code via a crafted response to a "pip install" operation.
http://www.reddit.com/r/Python/comments/17rfh7/warning_dont_use_pip_in_an_untrusted_network_a/
http://www.pip-installer.org/en/latest/installing.html
http://www.pip-installer.org/en/latest/news.html#changelog
https://bugzilla.redhat.com/show_bug.cgi?id=968059
pypa/pip#425
https://github.com/pypa/pip/pull/791/files