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| <ul id="-path-navigation"><li><a href="/index.html">Home</a></li><li>CVE-2016-2166</li></ul> |
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| <h1 id="cve-2016-2166">CVE-2016-2166</h1> |
| |
| <h2 id="severity">Severity</h2> |
| |
| <p>Moderate</p> |
| |
| <h2 id="affected-components">Affected components</h2> |
| |
| <p>Qpid Proton</p> |
| |
| <h2 id="affected-versions">Affected versions</h2> |
| |
| <p>0.9 through 0.12.0 inclusive</p> |
| |
| <h2 id="fixed-versions">Fixed versions</h2> |
| |
| <p>0.12.1 and later</p> |
| |
| <h2 id="description">Description</h2> |
| |
| <p>Python bindings silently ignore request for amqps if SSL/TLS not |
| supported.</p> |
| |
| <p>Messaging applications using the Proton Python API to provision an |
| SSL/TLS encrypted TCP connection may actually instantiate a |
| non-encrypted connection without notice if SSL support is |
| unavailable. This will result in all messages being sent in the clear |
| without the knowledge of the user.</p> |
| |
| <p>This issue affects those applications that use the Proton Reactor |
| Python API to create SSL/TLS connections. Specifically the |
| proton.reactor.Connector, proton.reactor.Container, and |
| proton.utils.BlockingConnection classes are vulnerable. These classes |
| can create an unencrypted connections if the "amqps://" URL prefix is |
| used.</p> |
| |
| <p>The issue only occurs if the installed Proton libraries do not support |
| SSL. This would be the case if the libraries were built without SSL |
| support or the necessary SSL libraries are not present on the system |
| (e.g. OpenSSL in the case of *nix).</p> |
| |
| <p>To check whether or not the Python API provides SSL support, use the |
| following console command:</p> |
| |
| <pre><code>python -c "import proton; print('%s' % 'SSL present' if proton.SSL.present() else 'SSL NOT AVAILBLE')" |
| </code></pre> |
| |
| <p>In addition, the issue can only occur if both ends of the connection |
| connect without SSL. This would be the case if the vulnerability is |
| active on both ends of the connection, or the non-affected endpoint |
| allows cleartext connections.</p> |
| |
| <h2 id="resolution">Resolution</h2> |
| |
| <p>Proton release 0.12.1 resolves this issue by raising an SSLUnavailable |
| exception when SSL is not available and a SSL/TLS connection is |
| requested via the "amqps://" URL prefix.</p> |
| |
| <p>A patch is also available.</p> |
| |
| <h2 id="credit">Credit</h2> |
| |
| <p>This issue was discovered by M. Farrellee from Red Hat.</p> |
| |
| <h2 id="references">References</h2> |
| |
| <p><a href="https://issues.apache.org/jira/browse/PROTON-1157">PROTON-1157</a></p> |
| |
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