[NEWS] PHP Authentication Suit for DreamWeaver XSS Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 08/05/03

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Date: 5 Aug 2003 14:30:34 +0200

    The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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      PHP Authentication Suit for DreamWeaver XSS Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

    The
    <http://www.macromedia.com/software/studio/productinfo/devnet_resource_kit/> PHP User Authentication Suite "consists of four server behaviors for restricting access to websites: Log In User, Restrict Access to Page, Log Out User, and Check New User Name". A vulnerability in the product allows remote attackers to include arbitrary HTML and JavaScript code into existing web pages (allowing them to capture existing and new sessions).

    DETAILS

    Vulnerable systems:
     * DreamWeaver MX version 6.0

    The XSS vulnerability is in the variable that returns the response
    whenever access has been denied:
    http://[TARGET]/[PATH]/[LOGIN PAGE].php?[ACCESS DENIED
    VARIABLE]=%2F[DIR1]%2F[DIR2]%2F[DIR3]%2F[FORBIDDEN PAGE]

    Whenever access is denied to a certain site, you are redirected to a page
    where the [LOGIN PAGE] is includes inside one of the variables being
    displayed.

    Generic Example:
    http://[TARGET]/[PATH]/[LOGIN PAGE].php?[ACCESS DENIED VARIABLE]="><
    script>alert('.::\/\|NSRG-18-7|/\/::.');</script>

    Site Specific Example:
    http://www.victim.foo/secrets/login.php?accessdenied=%2Fsecrets%2Findex.php <- (/secrets/index.php)

    Solution:
    Replace in your login page code:
     $FF_authFailedURL = $FF_authFailedURL .
     $FF_qsChar . "accessdenied=" . urlencode($FF_referrer);

    With:
     $FF_authFailedURL = $FF_authFailedURL .
     $FF_qsChar . "accessdenied=Your attempt was recorded";//\ \

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:novappc@novappc.com> Lorenzo
    Hernandez Garcia-Hierro.

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