Microsoft is apparently rushing to patch Windows to deal with URI vulnerabilities. Uniform Resource Identifiers are apparently used to launch programs from web browsers and a guy named Nathan McFeters thinks "Other" Unix based OS's might have the same problems:
In fact, Nathan McFeters, one of the researchers who has been studying the problem most closely says he hopes to present more details on how other Unix-based operating systems like Linux and Mac OS X may also be susceptible to what are known as URI (Uniform Resource Identifier) protocol handler flaws at the Toorcon hacking conference, being held next week in San Diego.
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http://www.infoworld.com/article/07/10/15/...I-issues_1.html