DefaultHostnameVerifier in Ldaptive (formerly vt-ldap) does not properly verify that the server hostname matches a domain name in the subject's Common Name (CN) 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-2014-3607
• https://bugzilla.redhat.com/show_bug.cgi?id=1140438
• https://code.google.com/archive/p/vt-middleware/issues/226
• https://code.google.com/archive/p/vt-middleware/issues/227
• https://code.google.com/archive/p/vt-middleware/issues/228
• http://shibboleth.net/community/advisories/secadv_20140919.txt
• https://code.google.com/archive/p/vt-middleware/source/default/commits
• https://code.google.com/p/vt-middleware/source/detail?r=3046