Heap-based buffer overflow in alwil avast! Anti-virus Engine before 4.7.869 allows remote attackers to execute arbitrary code via a crafted LHA file that contains extended headers with file and directory names whose concatenation triggers the overflow.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2006-4614
http://www.vupen.com/english/advisories/2006/3515
http://www.securityfocus.com/bid/19903