Over the past few years, file-sharing programs have grown inpopularity. Many people use them to share their music and games. Theyalso provide attackers with a convenient medium for infecting userswith Trojans or worms by offering tantalizing files. This kind of riskis well known to users and attackers alike; in Volume XII of Symantec'sInternet Security Threat Report, we noted that six of the top ten new malicious code families spread through file-sharing applications.
Another risk with file sharing, which many people are unaware of, isthe accidental exposure of confidential information. With nothing morethan a misplaced click, a user can unintentionally share the entirecontents of their hard drive, which could include their browserhistory, their personal documents, or their email messages.
Some file-sharing servers, such as certain Direct Connect servers,require a minimum...