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Vulnerability of Asterisk: denial of service via T.38 Zero Port

Synthesis of the vulnerability 

An attacker can trigger a fatal error via T.38 Zero Port of Asterisk, in order to trigger a denial of service.
Vulnerable systems: Asterisk Open Source.
Severity of this threat: 2/4.
Creation date: 04/03/2021.
Références of this weakness: AST-2021-006, CERTFR-2021-AVI-170, CVE-2019-15297, VIGILANCE-VUL-34754.

Description of the vulnerability 

An attacker can trigger a fatal error via T.38 Zero Port of Asterisk, in order to trigger a denial of service.
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This computer threat alert impacts software or systems such as Asterisk Open Source.

Our Vigil@nce team determined that the severity of this weakness announce 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 computer weakness bulletin.

Solutions for this threat 

Asterisk: version 18.2.2.
The version 18.2.2 is fixed:
  https://downloads.asterisk.org/pub/telephony/asterisk/releases

Asterisk: version 17.9.3.
The version 17.9.3 is fixed:
  https://downloads.asterisk.org/pub/telephony/asterisk/releases

Asterisk: version 16.16.2.
The version 16.16.2 is fixed:
  https://downloads.asterisk.org/pub/telephony/asterisk/releases
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