Heap-based buffer overflow in the SIS unpacker in avast! Anti-Virus Managed Client before 4.7.700 allows user-assisted remote attackers to execute arbitrary code via a crafted SIS archive, resulting from an "integer cast around."
https://exchange.xforce.ibmcloud.com/vulnerabilities/34501
http://www.vupen.com/english/advisories/2007/1935
http://www.securityfocus.com/bid/24155
http://www.securityfocus.com/archive/1/469585/100/0/threaded
http://www.kb.cert.org/vuls/id/125868
http://www.avast.com/eng/adnm-management-client-revision-history.html