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Top Forums UNIX for Dummies Questions & Answers Security issue and temp files Post 302358277 by pludi on Friday 2nd of October 2009 01:55:55 AM
Old 10-02-2009
Consider this: Your program uses a temporary file with a predictable name, to be used as a log. To this log, you write any input that isn't acceptable. A black-hat hacker now creates a symlink to /etc/passwd, and inputs this to your program:
Code:
toor:aaQSqAReePlq6:0:0::/tmp:/bin/sh

If everything goes well he has now access to a user called "toor" with an empty password and full administration rights. Not good, wouldn't you say?
 

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TMPFILE(3)								 1								TMPFILE(3)

tmpfile - Creates a temporary file

SYNOPSIS
resource tmpfile (void ) DESCRIPTION
Creates a temporary file with a unique name in read-write (w+) mode and returns a file handle . The file is automatically removed when closed (for example, by calling fclose(3), or when there are no remaining references to the file handle returned by tmpfile(3)), or when the script ends. For details, consult your system documentation on the tmpfile(3) function, as well as the stdio.h header file. RETURN VALUES
Returns a file handle, similar to the one returned by fopen(3), for the new file or FALSE on failure. EXAMPLES
Example #1 tmpfile(3) example <?php $temp = tmpfile(); fwrite($temp, "writing to tempfile"); fseek($temp, 0); echo fread($temp, 1024); fclose($temp); // this removes the file ?> The above example will output: writing to tempfile SEE ALSO
tempnam(3), sys_get_temp_dir(3). PHP Documentation Group TMPFILE(3)
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