A critical vulnerability in VMware's virtualization software for Windows lets attackers escape the "guest" operating system and modify or add files to the underlying "host" operating system, the company has acknowledged. As of Sunday, there was no patch available for the flaw, which affects VMware's Windows client virtualization programs, including Workstation, Player, and ACE. The company's virtual machine software for Windows servers and for Mac- and Linux-based hosts are not at risk.
The bug was reported by Core Security Technologies, makers of the penetration-testing framework CORE IMPACT, said VMware in a security alert issued last Friday. "Exploitation of this vulnerability allows attackers to break out of an isolated guest system to compromise the underlying host system that controls it," claimed Core Security.
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