The Asterisk Development Team has announced security releases for Certified Asterisk 1.8.11 and Asterisk 1.8 and 10. The available security releases are released as versions 1.8.11-cert4, 1.8.13.1, 10.5.2, and 10.5.2-digiumphones.

These releases are available for immediate download at http://downloads.asterisk.org/pub/telephony/asterisk/releases

The release of Asterisk 1.8.11-cert4, 1.8.13.1, 10.5.2, and 10.5.2-digiumphones resolve the following two issues:

* If Asterisk sends a re-invite and an endpoint responds to the re-invite with
  a provisional response but never sends a final response, then the SIP dialog
  structure is never freed and the RTP ports for the call are never released. If
  an attacker has the ability to place a call, they could create a denial of
  service by using all available RTP ports.  

* If a single voicemail account is manipulated by two parties simultaneously,
  a condition can occur where memory is freed twice causing a crash.

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

For more information about the details of these vulnerabilities, please read security advisories AST-2012-010 and AST-2012-011, 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/certified-asterisk/releases/ChangeLog-1.8.11-cert4
http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLog-1.8.13.1
http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLog-10.5.2
http://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLog-10.5.2-digiumphones

The security advisories are available at:

* http://downloads.asterisk.org/pub/security/AST-2012-010.pdf
* http://downloads.asterisk.org/pub/security/AST-2012-011.pdf

Thank you for your continued support of Asterisk!