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The bulk of the Mac OS X flaws affect both the client and server versions of the operating system. Attackers could exploit several of the vulnerabilities, specifically those related to image processing and file compression, by crafting malicious files and tricking people into opening them, Apple said. This attack method is seen often on computers that run Microsoft's Windows operating system. Other flaws could expose user data, let a malicious user gain elevated privileges on a system running Mac OS X, or cause a crash, Apple said.