Update to Asterisk 1.2.20.2: this is a security update which fixes

AST-2013-001, AST-2013-002, and AST-2013-003.

The Asterisk Development Team has announced security releases for Certified
Asterisk 1.8.15 and Asterisk 1.8, 10, and 11. The available security releases
are released as versions 1.8.15-cert2, 1.8.20.2, 10.12.2, 10.12.2-digiumphones,
and 11.2.2.


The release of these versions resolve the following issues:

* A denial of service exists in Asterisk's HTTP server. AST-2012-014, fixed
  in January of this year, contained a fix for Asterisk's HTTP server for a
  remotely-triggered crash. While the fix prevented the crash from being
  triggered, a denial of service vector still exists with that solution if an
  attacker sends one or more HTTP POST requests with very large Content-Length
  values.

  This vulnerability affects Certified Asterisk 1.8.15, Asterisk 1.8, 10, and 11

* A potential username disclosure exists in the SIP channel driver. When
  authenticating a SIP request with alwaysauthreject enabled, allowguest
  disabled, and autocreatepeer disabled, Asterisk discloses whether a user
  exists for INVITE, SUBSCRIBE, and REGISTER transactions in multiple ways.

  This vulnerability affects Certified Asterisk 1.8.15, Asterisk 1.8, 10, and 11

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-2013-001, AST-2013-002, and AST-2013-003, 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-1.8.20.2

The security advisories are available at:

 * http://downloads.asterisk.org/pub/security/AST-2013-001.pdf
 * http://downloads.asterisk.org/pub/security/AST-2013-002.pdf
 * http://downloads.asterisk.org/pub/security/AST-2013-003.pdf

Thank you for your continued support of Asterisk!

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