curl and libcurl 7.27.0 through 7.35.0, when using the SecureTransport/Darwinssl backend, as used in in Apple OS X 10.9.x before 10.9.2, does not verify that the server hostname matches a domain name in the subjects Common Name (CN) or subjectAltName field of the X.509 certificate when accessing a URL that uses a numerical IP address, which allows man-in-the-middle attackers to spoof servers via an arbitrary valid certificate.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Mac_os_x | Apple | * | 10.9.1 |
| Mac_os_x | Apple | 10.9 | 10.9 |