Update to Asterisk 1.8.23.1: this is a security fix release to fix

AST-2013-004 and AST-2013-005.

The Asterisk Development Team has announced security releases for
Certified Asterisk 1.8.15, 11.2, and Asterisk 1.8, 10, and 11. The
available security rele ases are released as versions 1.8.15-cert2,
11.2-cert2, 1.8.23.1, 10.12.3, 10.12.3-di giumphones, and 11.5.1.

The release of these versions resolve the following issues:

* A remotely exploitable crash vulnerability exists in the SIP
  channel driver if an ACK with SDP is received after the channel
  has been terminated.  The handling code incorrectly assumes that
  the channel will always be present.

* A remotely exploitable crash vulnerability exists in the SIP
  channel driver if an invalid SDP is sent in a SIP request that
  defines media descriptions before connection information. The
  handling code incorrectly attempts to reference the socket address
  information even though that information has not yet been set.

These issues and their resolutions are described in the security advisories.

For more information about the details of these vulnerabilities,
please read security advisories AST-2013-004 and AST-2013-005,
which were released at the same time as this announcement.

For a full list of changes in the current releases, please see the ChangeLogs:

http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLog-1.8.23.1

The security advisories are available at:

 * http://downloads.asterisk.org/pub/security/AST-2013-004.pdf
 * http://downloads.asterisk.org/pub/security/AST-2013-005.pdf

Thank you for your continued support of Asterisk!

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