[UNIX] AHG EZshopper loadpage.cgi Directory Traversal (.|./ Attack)

From: SecuriTeam (support_at_securiteam.com)
Date: 12/01/04

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Date: 1 Dec 2004 18:34:16 +0200

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      AHG EZshopper loadpage.cgi Directory Traversal (.|./ Attack)
    ------------------------------------------------------------------------

    SUMMARY

    AHG's <http://www.ahg.com/ezshopper3/index.htm> EZshopperA directory
    traversal vulnerability in the EZshopper product allows a remote attacker
    to disclose sensitive files stored outside the bound HTML root directory.

    DETAILS

    The EZshopper product makes an effort to prevent attackers from exploiting
    directory traversal vulnerabilities in the loadpage.cgi, however this
    prevention mechanism lacks the ability to prevent the attack from
    happening when the ".|./" is used. This occurs as the URL is first
    sanitized of its ".." combinations and then of its "|" characters.

    Vulnerable code:
    if ($data{'file'}=~/\.\./)
     {
     print "Content-type: text/html\n\n";
     print "Invalid path";
     exit;
     }
    $data{'user_id'} =~ s/[\.\|<>]+//g;

    $data{'file'}=~s/[\|;><]+//g;
    if ($data{'file'} !~ /\.s?html?$/)
     {
     print "Content-type: text/html\n\n";
     print ".";
     exit;
     }
    $file="$root/$data{'file'}";

    As can be seen, the program first filters out ".." and then "|", which
    causes the vulnerability.

    Example:
    The following example illustrates the issue:
    http://targethost/cgi-bin/loadpage.cgi?user_id=id&file=.|./.|./.|./.|./.|./etc/passwd%00.html

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:zero-x@linuxmail.org> Zero_X
    www.lobnan.de Team.

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