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Vulnerability of Avast: escape from Sandbox

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.
Vulnerable software: Avast AV.
Severity of this announce: 1/4.
Creation date: 21/04/2016.
Références of this computer vulnerability: CVE-2016-4025, VIGILANCE-VUL-19429.

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.
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This computer threat note impacts software or systems such as Avast AV.

Our Vigil@nce team determined that the severity of this weakness alert is low.

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

An attacker with a expert ability can exploit this computer weakness note.

Solutions for this threat 

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