On Tue, 10 Aug 2004 02:16:24 +0200, Thomas Loch said: > What if someone creates a shell script that simply "cat /etc/shadow" and sets > the SetUID flag. Then he makes a backup of that file and restores the backup > while he prevents the chown-command anyhow. All files will remain "root". > Including the script. The execution of this script will print out the > shadowed encrypted passwords. This can even be used to chmod the shadow file > and make it readable for everyone You'd probably have to work a *little* harder than a shell script - most Unixoid systems don't allow the execution of a setUID shell script due to various and sundry race conditions involved (which is why 'suidperl' exists). Other than that, you're on the right track.. ;)
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