Dear full-disclosure@lists.grok.org.uk, 

  Since  it's  already  wide  spread on the public forums and exploit is
  published  on  multiple  sites and there is no way to stop it, I think
  it's time to alert lists about this.

  On the one of Russian forums:
http://www.kuban.ru/forum_new/forum2/files/19124.html 
  message  was  published  by  NULL  about  vulnerability  in Windows on
  processing   MessageBox()   with   MB_SERVICE_NOTIFICATION   flag  and
  message/caption  beggining with \??\. Vulnerability seems to be memory
  corruption  in  kernel  and  causes  system  crash  or  hang after few
  attempts.  It  seems  to happen because message is logged to event log
  and may point to some problem with event logs processing.

  Vulnerability details and code may be found here:
http://www.security.nnov.ru/Gnews944.html 

  There  is  potential  remote  exploitation vector if some service uses
  user-supplied  input  for  MessageBox() function. Messenger service is
  not  vulnerable  in  this way, because it prepends user-supplied input
  with additional string.

  I contacted Microsoft on this issue on December, 16.

-- 
http://www.security.nnov.ru 
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