full-disclosure - I've found the Allchin bug.

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From: davek_throwaway at hotmail.com (Dave Korn)
Subject: I've found the Allchin bug.

[Refs:
http://www.avet.com.pl/pipermail/bugdev/2002-August/000137.html
http://www.eweek.com/article2/0,3959,5264,00.asp
http://theregister.co.uk/content/archive/25194.html
]

  Nope.  You're wrong.  He wasn't referring to windows message queues, he 
was referring to MSMQ.  You'll find that MSMQ has GUID

    Interface UUID: 77df7a80-f298-11d0-8358-00a024c480a8
    Interface Ver: 1
    Interface Ver Minor: 0

and that opnums 6, 7 and 8 are quite clearly MQLocateBegin, MQLocateNext and 
MQLocateEnd.  Try passing an overly-long string as an MQRESTRICTION to the 
MQLocateBegin function, and you'll find a unicode heap overflow in mqsvc.exe 
that lets you overwrite an arbitrary address with an arbitrary long.

  You'll also find that this works in w2k sp2, and not in sp4; I haven't 
tested sp3 yet.  Looks like they quietly fixed it up without any great 
publicity.....

  If anyone needs further convincing, I'll tidy up and post my p-o-c code, 
but I think it's pretty clear from his words that he meant MSMQ and not the 
underlying win32 api.

         DaveK

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