An exploit writer at Core Security Technologies has discovered a serious vulnerability that exposes users of Microsoft's Virtual PC virtualization software to malicious hacker attacks. The vulnerability, which is unpatched, essentially allows an attacker to bypass several major security mitigations — DEP, SafeSEH and ASLR — to exploit the Windows operating system. As a result, some applications with bugs that are not exploitable when running in a not-virtualized operating system are rendered exploitable if running within a guest OS in Virtual PC.

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