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sheet05/a3/b.txt
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5
sheet05/a3/b.txt
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The script runs with root privileges because the setuid bit is set.
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Since it just asks for a username and saves the new hash to /etc/shadow,
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and there is no validation checking if the user running the program is actually changing their own password,
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someone could simply run the program, type root as the username, and set a new password for the root user.
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The script would then overwrite the actual root password in /etc/shadow.
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