This temporary file is an intermediate file that is created by shar for storing temporary contents during its execu- tion. Also, if a file with this name already exists, then shar opens the file and overwrites it with temporary contents. If directory /tmp allows anyone to write to it, a vulnerability exists. An attacker can exploit such a vulnerability to overwrite a victim’s file. (1) What knowledge about shar should the attacker have? (2) Describe the command that the attacker issues in order to have shar overwrite an arbitrary file of a victim. Hint: the command is issued before shar is executed. (3) Suggest a simple fix to the shar utility to prevent the attack. Note that this is not a setuid question.

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