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Vigil@nce - Avast: escape from Sandbox

May 2016 by Vigil@nce

This bulletin was written by Vigil@nce : https://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can use an IOCTL of Avast, in order to create a file
from an application protected by the sandbox.

Impacted products: Avast AV.

Severity: 1/4.

Creation date: 21/04/2016.

DESCRIPTION OF THE VULNERABILITY

The Avast product installs the aswSnx.sys (Avast Virtualization)
driver, which offers a Sandbox service to jail applications.

However, using snxhk.dll and the IOCTL 0x82AC0168, an attacker can
escape from jail, to create a file.

An attacker can therefore use an IOCTL of Avast, in order to
create a file from an application protected by the sandbox.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/Avast-escape-from-Sandbox-19429


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