e107 web portal Referers HTTP Injection

From: Chinchilla (kingchinchilla_at_hotmail.com)
Date: 05/21/04

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    Date: 21 May 2004 01:31:58 -0000
To: bugtraq@securityfocus.com
    ('binary' encoding is not supported, stored as-is)

    Synopsis:

    All versions of e107 have a vulnerability that
    allows html tags and content to be posted to the stats
    page and to be listed under Referers and may also list
    a screen size that they wish.

    Description:

    All versions of e107 have a vulnerability that
    allows html tags and content to be posted to the stats
    page and to be listed under Referers and thus allowing
    an attacker to put any site link or code they want on
    the list of Referers.

    The Problem lies within the e107 log plugin
    file /e107_plugins/log/log.php as it does not parse
    < > and / tags thus allowing a user to enter html
    content like so:

    target.com/e107_plugins/log/log.php?referer=
    code<br>goes<here>
    &color=24&eself=http://www.target.com/stats.php&res=1341X1341

    This would print out:

    code
    goes
    here

    In the Referers list and print out a screen size of
    1341x1341 with a color depth of 24.

    Impact:

    This could lead someone to graffiti the stats page
    with content of their liking which could further lead
    someone to input their account info, etc. With use
    of proxies someone may also advertise their site as
    the top referer.

    Work-around:

    The easiest way to fix this problem is to
    simply turn off stats all together. Even if you edit
    log.php to parse html tags people will still be able
    to post text to the Referers list.

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