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| <ul id="-path-navigation"><li><a href="/index.html">Home</a></li><li>CVE-2016-4467</li></ul> |
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| <h1 id="cve-2016-4467">CVE-2016-4467</h1> |
| |
| <h2 id="severity">Severity</h2> |
| |
| <p>Medium</p> |
| |
| <h2 id="affected-components">Affected components</h2> |
| |
| <p>Qpid Proton</p> |
| |
| <h2 id="affected-versions">Affected versions</h2> |
| |
| <p>0.8 through 0.13.0 inclusive</p> |
| |
| <h2 id="fixed-versions">Fixed versions</h2> |
| |
| <p>0.13.1 and later</p> |
| |
| <h2 id="description">Description</h2> |
| |
| <p>Failure to verify that the server host name matches the certificate |
| host name on Windows.</p> |
| |
| <p>Messaging applications using the Proton C library to provide SSL/TLS |
| authentication on Windows can falsely authenticate a server whose name |
| does not match the server name in the connection specifier. Proton C |
| bindings are affected to a greater or lesser degree depending on how |
| they use the underlying Proton C library.</p> |
| |
| <p>In Proton C, this can only happen if PN_SSL_VERIFY_PEER_NAME has been |
| specified as the verification mode and pn_ssl_set_peer_hostname() has |
| not been called at all or has been called with a NULL value for a |
| particular pn_ssl_t object.</p> |
| |
| <p>In the Proton C++ binding, this will always happen unless the |
| application has separately specified a virtual_host name for an |
| SSL/TLS connection.</p> |
| |
| <p>In the Proton Python and Ruby bindings, this will only happen if the |
| application has separately specified a NULL virtual_host name for an |
| SSL/TLS connection after creating the connection but before the |
| authentication step.</p> |
| |
| <p>This issue only occurs on Windows versions of Proton that use the |
| default SChannel-based security layer.</p> |
| |
| <p>In any of the preceding cases, it is possible for a man-in-the-middle |
| attacker to spoof an SSL/TLS server if they had a certificate that was |
| valid for any of the application's Certificate Authorities.</p> |
| |
| <h2 id="resolution">Resolution</h2> |
| |
| <p>Proton release 0.13.1 resolves this issue in the SChannel-based |
| security layer by obtaining a default non-NULL peer hostname from the |
| associated connection address when initialized and by always failing |
| hostname verification if PN_SSL_VERIFY_PEER_NAME has been specified |
| along with a NULL peer hostname. This resolution matches the |
| associated behaviour of the OpenSSL-based security layer.</p> |
| |
| <h2 id="references">References</h2> |
| |
| <p><a href="https://issues.apache.org/jira/browse/PROTON-1228">PROTON-1228</a> and |
| <a href="https://issues.apache.org/jira/browse/PROTON-1233">PROTON-1233</a></p> |
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