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Vulnerability of Avast: memory corruption via Authenticode

Synthesis of the vulnerability 

An attacker can send a PE file with malicious Authenticode data, to generate a memory corruption in Avast, in order to trigger a denial of service, and possibly to run code.
Vulnerable products: Avast AV.
Severity of this weakness: 3/4.
Creation date: 07/03/2016.
Références of this bulletin: CVE-2016-3986, VIGILANCE-VUL-19110.

Description of the vulnerability 

An executable program in PE format contains Authenticode data, to authenticate the author.

However, when Avast analyzes these data, the StreamHashClose() function corrupts its memory.

An attacker can therefore send a PE file with malicious Authenticode data, to generate a memory corruption in Avast, in order to trigger a denial of service, and possibly to run code.
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This computer weakness impacts software or systems such as Avast AV.

Our Vigil@nce team determined that the severity of this vulnerability note is important.

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

An attacker with a expert ability can exploit this cybersecurity threat.

Solutions for this threat 

Avast: fixed versions for Authenticode.
Versions posterior to the 4th of March 2016.
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