Research In Motion, the maker of the popular BlackBerry line of handheld devices, has issued a security patch for the popular handhelds, warning they are vulnerable to attacks by hackers. According to security experts, if this latest patch is not applied, there is a risk hackers could exploit the vulnerability and take over a company’s server. To date, no hacker has exploited the vulnerability. As RIM put it, “Multiple security vulnerabilities exist in the PDF distiller of some released versions of the BlackBerry