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| <ul id="-path-navigation"><li><a href="/index.html">Home</a></li><li>CVE-2015-0203</li></ul> |
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| <h1 id="cve-2015-0203">CVE-2015-0203</h1> |
| |
| <h2 id="severity">Severity</h2> |
| |
| <p>Moderate</p> |
| |
| <h2 id="affected-components">Affected components</h2> |
| |
| <p>Qpid C++ broker</p> |
| |
| <h2 id="affected-versions">Affected versions</h2> |
| |
| <p>0.30 and earlier</p> |
| |
| <h2 id="fixed-versions">Fixed versions</h2> |
| |
| <p>0.32 and later</p> |
| |
| <h2 id="description">Description</h2> |
| |
| <p>Qpidd can be crashed by an authenticated user.</p> |
| |
| <p>Certain unexpected protocol sequences cause the broker process to |
| crash due to insufficient checking. Three distinct cases were |
| identified as follows:</p> |
| |
| <ul> |
| <li><p>The AMQP 0-10 protocol defines a sequence set containing id |
| ranges. The qpidd broker can be crashed by sending it a |
| sequence-set containing an invalid range, where the start of the |
| range is after the end. This condition causes an assertion, which |
| causes the broker process to exit.</p></li> |
| <li><p>The AMQP 0-10 protocol defines header- and body- segments that may |
| follow certain commands. The only command for which such segments |
| are expected by qpidd is the message-transfer command. If another |
| command is sent that includes header and/or body segments, this |
| will cause a segmentation fault in the broker process, causing it |
| then to exit.</p></li> |
| <li><p>The AMQP 0-10 protocol defines a session-gap control that can be |
| sent on any established session. The qpidd broker does not support |
| this control and responds with an appropriate error if requested on |
| an established session. However, if the control is sent before the |
| session is opened, the brokers handling causes an assertion which |
| results in the broker process exiting.</p></li> |
| </ul> |
| |
| <p>Authentication can be used to restrict access to the broker. However |
| any authenticated user would be able to trigger this condition which |
| could therefore be considered a form of denial of service.</p> |
| |
| <h2 id="resolution">Resolution</h2> |
| |
| <p>A patch is available (QPID-6310) that handles all these errors by |
| sending an exception control to the remote peer and leave the broker |
| available to all other users. The fix will be included in subsequent |
| releases, but can be applied to 0.30 if desired.</p> |
| |
| <h2 id="credit">Credit</h2> |
| |
| <p>This issue was discovered by G. Geshev from MWR Labs.</p> |
| |
| <h2 id="references">References</h2> |
| |
| <p><a href="https://issues.apache.org/jira/browse/QPID-6310">QPID-6310</a></p> |
| |
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