httplib2 prior to version 0.10.1, after an initial connection is made, does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.

References

• https://nvd.nist.gov/vuln/detail/CVE-2013-2037
• https://bugs.launchpad.net/httplib2/+bug/1175272
• http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=706602
• http://code.google.com/p/httplib2/issues/detail?id=282
• http://seclists.org/oss-sec/2013/q2/257
• http://www.ubuntu.com/usn/USN-1948-1
• httplib2/httplib2#5
• httplib2/httplib2@40cbdcc
• https://web.archive.org/web/20200228052625/http://www.securityfocus.com/bid/52179