This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Skype. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the handling of the Skype URI handler. A crafted URL can trigger execution of a system call composed from a user-supplied string. An attacker can leverage this vulnerability to execute code under the context of the current user at medium integrity.