full-disclosure - Re: 0day: Hacking secured CITRIX from outside

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Date: Wed, 10 Oct 2007 14:05:46 -0400
From: <full-disclosure@...hmail.com>
To: <bugtraq@...urityfocus.com>, <full-disclosure@...ts.grok.org.uk>,
	<pdp.gnucitizen@...glemail.com>
Subject: Re: 0day: Hacking secured CITRIX from outside


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SHUT UP VLADIS

On Wed, 10 Oct 2007 11:47:23 -0400 "pdp (architect)"
<pdp.gnucitizen@...glemail.com> wrote:
>http://www.gnucitizen.org/blog/0day-hacking-secured-citrix-from-
>outside
>
>In the true spirit of GNUCITIZEN half(partial)-disclosure
>initiative,
>we announce that it is possible to gain user access level on
>integrated remote CITRIX servers. The bug/feature does not relay
>on
>any client/server vulnerabilities nor client/server
>misconfiguration
>issues. All an attacker needs to do to exploit the weakness is to
>lure
>a victim, part of an integrated network, to a malicious website or
>trick them into opening specially crafted ICA files. The attack
>results into remote command execution with the access level of the
>current user.
>
>The success of the attack relays on the fact that the victim (the
>proxy) is part of a CITRIX ring to which he/she can perform pass
>through authentication. Once a connection is instantiated, the
>victim
>will unwillingly and transparently login into CITIRIX and perform
>several commands specified by the attacker. The attacker can
>simply
>instruct the remote desktop to download files from a remote TFTP
>server and execute them locally. Once the attack is performed, the
>local connection is terminated and the CITRIX session is cleared.
>No
>user interaction is required!
>
>CAUTION!!! The attack can be used to circumvent/bypass border
>firewalls and sneak into private networks. This attack is of type
>CRSF
>(Cross-site Request forgery), although it does not relay on Web
>bugs.
>The attack vector works flawlessly on IE and Firefox (when
>configured
>correctly). It also works with any email client or other types of
>file
>sharing mechanisms. All versions of CITRIX and CITRIX client are
>affected. The attack may fail on certain setups.
>
>If you manage to re-discover the type of vulnerability outlined in
>this post, we encourage you to keep it private. Give some time for
>the
>folks at CITRIX to react. Currently, I am not aware of any remedy
>against the attack. Given CITRIX's popularity among corporations
>and
>big organizations, it is highly recommended to take this warning
>with
>extra caution.
>
>--
>pdp (architect) | petko d. petkov
>http://www.gnucitizen.org
>
>_______________________________________________
>Full-Disclosure - We believe in it.
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