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Vulnerability of Asterisk: denial of service via res_http_websocket.so

Synthesis of the vulnerability 

An attacker can generate a fatal error via res_http_websocket.so of Asterisk, in order to trigger a denial of service.
Vulnerable systems: Asterisk Open Source, Debian.
Severity of this threat: 2/4.
Creation date: 21/09/2018.
Références of this weakness: AST-2018-009, CERTFR-2018-AVI-452, CVE-2018-17281, DLA-1523-1, DSA-4320-1, VIGILANCE-VUL-27278.

Description of the vulnerability 

An attacker can generate a fatal error via res_http_websocket.so of Asterisk, in order to trigger a denial of service.
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This threat alert impacts software or systems such as Asterisk Open Source, Debian.

Our Vigil@nce team determined that the severity of this computer vulnerability bulletin is medium.

The trust level is of type confirmed by the editor, with an origin of intranet client.

An attacker with a expert ability can exploit this weakness note.

Solutions for this threat 

Asterisk: version 15.6.1.
The version 15.6.1 is fixed:
  https://downloads.asterisk.org/pub/telephony/asterisk/releases

Asterisk: version 14.7.8.
The version 14.7.8 is fixed:
  https://downloads.asterisk.org/pub/telephony/asterisk/releases

Asterisk: version 13.23.1.
The version 13.23.1 is fixed:
  https://downloads.asterisk.org/pub/telephony/asterisk/releases

Debian 8: new asterisk packages.
New packages are available:
  Debian 8: asterisk 1:11.13.1~dfsg-2+deb8u6

Debian 9: new asterisk packages.
New packages are available:
  Debian 9: asterisk 1:13.14.1~dfsg-2+deb9u4
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