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Vulnerability of Avast: memory corruption via Array.prototype.toString

Synthesis of the vulnerability 

An attacker can trigger a memory corruption via Array.prototype.toString of Avast, in order to trigger a denial of service, and possibly to run code.
Impacted systems: Avast AV.
Severity of this alert: 3/4.
Creation date: 02/06/2020.
Références of this alert: PROJ-ZERO-2018, VIGILANCE-VUL-32369.

Description of the vulnerability 

An attacker can trigger a memory corruption via Array.prototype.toString of Avast, in order to trigger a denial of service, and possibly to run code.
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This threat impacts software or systems such as Avast AV.

Our Vigil@nce team determined that the severity of this computer threat is important.

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

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a specialist ability can exploit this cybersecurity bulletin.

Solutions for this threat 

Avast: version 2020-Mar-11.
The version 2020-Mar-11 is fixed.
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Computer vulnerabilities tracking service 

Vigil@nce provides a network vulnerability alert. The Vigil@nce vulnerability database contains several thousand vulnerabilities.