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Vulnerability of Avast: escape from Sandbox

Synthesis of the vulnerability 

An attacker can use HWND_BROADCAST to escape the Sandbox of Avast, in order to execute code with no constraint.
Vulnerable products: Avast AV.
Severity of this weakness: 2/4.
Creation date: 21/01/2016.
Références of this bulletin: VIGILANCE-VUL-18786.

Description of the vulnerability 

The Avast product offers a Sandbox service to jail applications.

However, a HWND_BROADCAST message can send characters to a cmd.exe process, in order to escape from the jail.

An attacker can therefore use HWND_BROADCAST to escape the Sandbox of Avast, in order to execute code with no constraint.
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This threat alert impacts software or systems such as Avast AV.

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 user shell.

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

Solutions for this threat 

Avast: version for Sandbox.
The update on 20th of January 2016 is fixed.
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