Unspecified vulnerability in avast! 4 Home and Professional Editions before 4.7.1098 allows remote attackers to have an unknown impact via a crafted TAR archive.
https://exchange.xforce.ibmcloud.com/vulnerabilities/38877
http://www.vupen.com/english/advisories/2007/4097
http://www.avast.com/eng/avast-4-home_pro-revision-history.html