KaZaA Media Desktop (KMD) 2.0 launches advertisements in the Internet Explorer (IE) local security zone, which could allow remote attackers to view local files and possibly execute arbitrary code.
fasttrack p2p, as used in (1) KaZaA, (2) grokster, and (3) morpheus allows remote attackers to spoof other users by modifying the username and network information in the message header.