The contribution feature in Zamboni 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, related to use of the Python urllib2 library.

References

• https://nvd.nist.gov/vuln/detail/CVE-2012-5822
• https://exchange.xforce.ibmcloud.com/vulnerabilities/79929
• http://www.cs.utexas.edu/~shmat/shmat_ccs12.pdf