[UNIX] Owl Intranet Engine Security Bypassing

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To: list@securiteam.com
Date: 21 May 2003 17:32:48 +0200

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  Owl Intranet Engine Security Bypassing
------------------------------------------------------------------------

SUMMARY

 <http://owl.sourceforge.net/> Owl is a multi user document repository
(knowledgebase) system written in PHP4 for publishing of files/documents
onto the web for a corporation, small business, group of people, or just
for yourself. A vulnerability in the product allows remote attackers to
bypass the authentication mechanism and access restricted functionality.

DETAILS

Vulnerable systems:
 * Owl version 0.71

By passing a URL string with a bogus username, you may view the contents
within the OWL interface. Using this technique, you may bypass user
authentication and a valid session ID.

Within the PHP source to Owl there is a browse.php script which calls its
library (lib/owl.lib.php). This PHP library does not check for valid
username and password.

Vulnerable code:
intranet/lib/owl.lib.php

  ------------------- snip ------------------
  function verify_login($username, $password) {
    global $default;
    $sql = new Owl_DB;
    $sql->query("select * from $default->owl_users_table where username =
'$username' and password = '" . md5($password) . "'");
    $numrows = $sql->num_rows($sql);
    // Bozz Begin added Password Encryption above, but for now
    // I will allow admin to use non crypted password untile he
    // upgrades all users
    if ($numrows == "1") {
        while($sql->next_record()) {
            if ( $sql->f("disabled") == 1 )
                $verified["bit"] = 2;
            else
                $verified["bit"] = 1;
            $verified["user"] = $sql->f("username");
            $verified["uid"] = $sql->f("id");
            $verified["group"] = $sql->f("groupid");
            $maxsessions = $sql->f("maxsessions") + 1;
        }
    }
    // Remove this else in a future version
    else {
      if ($username == "admin") {
        $sql->query("select * from $default->owl_users_table where
username = '$username' and password = '$password'");

  ------------------- snip ------------------

Example:
http://www.someplace.com/intranet/browse.php?loginname=whocares

ADDITIONAL INFORMATION

The information has been provided by
<mailto:cdowns@bigunz.angrypacket.com> Christopher M Downs.

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