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source: http://www.securityfocus.com/bid/3326/info
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SpeechD is a device-independent layer for speech synthesis under Linux, providing an interface for speech-based applications or device drivers.
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SpeechD has been found to contain a flaw under certain implementations which can permit a local user to pass malcious commands to the /dev/speech device, and have them executed with the privilege level of the speechd user, which is usually root.
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echo "';[hostile shell command]" >/dev/speech |