Title: Directory Pro Arbitrary File Disclosure Vulnerability
Severity: HIGH
Description:
Webdirectory Pro is a web application used to create a searchable directory of links developed by Cosmicperl.
Webdirectory Pro contains an input validation vulnerability which may lead to disclosure of sensitive information to attackers.
The vulnerability exists when the 'directorypro.cgi' script, written in perl, attempts to open a file with a filename based on user input. The filename is constructed using a client-supplied form variable called 'show', which is prepended by path information and appended with the appropriate extension before being passed to open().
Unfortunately it is possible to force the misinterpretation of the filename if a NULL byte is inserted into the variable. While perl ignores NULL bytes, the underlying system calls which are used by open() use NULL bytes to terminate strings. A NULL byte can be inserted into the value of the 'show' variable, which will cause the filename to be 'terminated' prematurely (the extension appdended will be 'cut off') when the filename is passed to the actual system call.
Therefore, by using "../" sequences to traverse up directories in the filesystem and terminating with a NULL byte, it is possible to have directorypro.cgi open an arbitrary webserver-readable file on the filesystem. The contents of this file are then output to the client.
Affected Products:
- Cosmicperl Directory Pro 2.0.0
References:
- Cosmicperl: Directory Pro Product Homepage
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