Vulnerability Note VU#125868

Avast! antivirus buffer overflow vulnerability

Overview

Avast! antivirus contains a buffer overflow vulnerability. This vulnerability may allow an attacker to execute code a vulnerable system.

I. Description

Avast! antivirus is an antivirus application that can scan different types of files. The Symbian Installer Format (SIS) file format is used by the Symbian OS to package files for distribution to mobile devices.Avast! antivirus contains a buffer overflow vulnerability. By convincing a user to scan a specially crafted SIS file with a vulnerable version of Avast! antivirus, an attacker may be able to trigger the overflow.

II. Impact

A remote unauthenticated attacker may be able to execute arbitrary code, or create a denial-of-service condition.

III. Solution

Update

Version 4.7.700 has been released to address this issue. Users are encouraged to update as soon as possible.

Systems Affected

References

http://www.avast.com/eng/adnm-management-client-revision-history.html
http://www.avast.com/eng/search.php?searchFor=sergio+alvarez
http://www.nruns.com/security_advisory.php
http://www.symbian.com/Developer/techlib/v70sdocs/doc_source/ToolsAndU tilities/Installing-ref/PackageFileFormatReference.guide.html

Credit

Thanks to Sergio Alvarez of n.runs AG and Avast! for information that was used in this report.

This document was written by Ryan Giobbi.

Other Information

Produced 2007 by US-CERT, a government organization