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From: Nu Omega Tau (nu_omega_taualtavista.com)
Date: Mon Jan 07 2002 - 08:30:05 CST

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    Description (from official page): FAQmanager is one simple perl script that allow you to easily set up and maintain a FAQ (Frequently Asked Questions).

    Vulnerability: Faqmanager can be used to read files on the server the httpd has access to. Example: faqmanager.cgi?toc=/etc/passwd%00 will show the system's /etc/passwd file. Exploitation with Windows systems wasn't tested.

    Vendor notified: Yes, new version available:
    http://www.fourteenminutes.com/code/faqmanager/FAQmanager_2.2.6.zip

    Note: The new version seems to be semi-secure, it doesn't filter out the nullbyte, just the slash. Also doesn't it filter out dots. On some operating systems, I believe only BSD ones, bugs like these can be used to read directory listings. For example when entering a dot the current directory's listing can be viewed.
    Also, the source to scripts in the current directory can still be viewed, nasty if you installed the script directly in your /cgi-bin directory and you got al your other scripts in there too.
    A solution would be to replace the untaint routine in the script with this slightly modified one that filters out the nullbyte:

    sub untaint
    {
      return "" if (!$_[0]);
     
      my $taint = $_[0];
     
      $taint =~ s/[\|\/]//g;
      $taint =~ s/\0//gii;
      $taint =~ /^[\<\+\>]*(.*)$/gi;
      return $1; # _not_ return $taint
    }

    Nu

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    I just found the any key.
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