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Vulnerability of Asterisk: denial of service via PJSIP Channel Driver

Synthesis of the vulnerability 

An attacker can trigger a fatal error via PJSIP Channel Driver of Asterisk, in order to trigger a denial of service.
Impacted software: Asterisk Open Source.
Severity of this computer vulnerability: 2/4.
Creation date: 18/02/2021.
Références of this announce: AST-2021-005, CERTFR-2021-AVI-136, CVE-2021-26906, VIGILANCE-VUL-34618.

Description of the vulnerability 

An attacker can trigger a fatal error via PJSIP Channel Driver of Asterisk, in order to trigger a denial of service.
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This computer vulnerability announce impacts software or systems such as Asterisk Open Source.

Our Vigil@nce team determined that the severity of this cybersecurity 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 threat alert.

Solutions for this threat 

Asterisk: version 18.2.1.
The version 18.2.1 is fixed:
  https://www.asterisk.org/downloads/

Asterisk: version 17.9.2.
The version 17.9.2 is fixed:
  https://www.asterisk.org/downloads/

Asterisk: version 16.16.1.
The version 16.16.1 is fixed:
  https://www.asterisk.org/downloads/

Asterisk: version 13.38.2.
The version 13.38.2 is fixed:
  https://www.asterisk.org/downloads/
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