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[BMSA 2008-07] Format string vulnerability in 5th street


:Title: Format string vulnerability in 5th street (Hot Step, High Street 5)
:Severity: Critical
:Reporter: Blue Moon Consulting, superkhung
:Products: 5th street and derived clients
:Fixed in: --


5th street is a massively multiplayer online dance game produced by
Snail Game and distributed in countries such as Malaysia, Singapore and
Vietnam under different names High Street 5, Hot Step.

5th street contains a format string vulnerability in its
``dx8render.dll`` module. Before a chat message is rendered in a
balloon, this message is used as a format string in a call to
``vsnwprintf`` function.

This vulnerability allows an attacker to remotely and instantly crash
other players' clients. If carefully exploited, this will also lead to
arbitrary code execution on the target machine.


There is no workaround.


Customers are advised to contact your local game distributor in order to
obtain a proper fix.


Blue Moon Consulting adapts `RFPolicy v2.0
<http://www.wiretrip.net/rfp/policy.html>`_ in notifying vendors.

:Initial vendor contact:

  June 15, 2008: Initial contact sent to overseas@xxxxxxxxxxxxx

  June 17, 2008: Another request for communication sent to
overseas@xxxxxxxxxxxxx and local game distributors

:Vendor response:

  June 17, 2008: Further communication requested to be sent to James
Gaoyu of Snail Game

:Further communication:

  June 17, 2008: Technical details and request for estimated time of a
patch sent to James Gaoyu

  June 22, 2008: Request for estimated time of a patch sent to James Gaoyu

  June 23, 2008: Alert sent to local game distributors

:Public disclosure: June 25, 2008

:Exploit code: Send a chat message containing ``%5000000.x``


The information provided in this advisory is provided "as is" without
warranty of any kind. Blue Moon Consulting Co., Ltd disclaims all
warranties, either express or implied, including the warranties of
merchantability and fitness for a particular purpose. Your use of the
information on the advisory or materials linked from the advisory is at
your own risk. Blue Moon Consulting Co., Ltd reserves the right to
change or update this notice at any time.

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