XADM: Chat Service Failure Caused by an Invalid Number of Reply/Request Arguments

MORE INFORMATION

With the fix applied, the Exchange Server Chat Service is modified to check the number of arguments provided and to reply with an error to a chat client that does not provide enough arguments.

When you are experiencing this problem, if you examine the Drwtsn32.log file generated by a failing process in the %systemroot% directory, you may see an entry similar to the following:

   Application exception occurred:
        App: exe\inetinfo.dbg (pid=137)
        When: 12/10/1997 @ 9:52:13.279
        Exception number: c0000005 (access violation)

   State Dump for Thread Id 0x1c7

   eax=78040338 ebx=0215415a ecx=00000009 edx=00002000 esi=00000000
   edi=1003a8bc
   eip=7802b225 esp=07bbeb40 ebp=07bbeb4c iopl=0         nv up ei pl zr na
   po nc
   cs=001b  ss=0023  ds=0023  es=0023  fs=0038  gs=0000
   efl=00000246

   function: memicmp
        7802b208 7440             jz      memicmp+0x4d (7802b24a)
        7802b20a 8b7508           mov     esi,[ebp+0x8]
        7802b20d 8b7d0c           mov     edi,[ebp+0xc]
        7802b210 8d0538030478    lea eax,[_lc_handle (78040338)]
        7802b216 83780800         cmp    dword ptr [eax+0x8],0x0
        7802b21a 7540             jnz     memicmp+0x5f (7802b25c)
        7802b21c b741             mov     bh,0x41
        7802b21e b35a             mov     bl,0x5a
        7802b220 b620             mov     dh,0x20
        7802b222 2e8bc0           mov     eax,cs:eax
   FAULT ->7802b225 8a26             mov     ah,[esi]
        7802b227 46               inc     esi
        7802b228 8a07             mov     al,[edi]
        7802b22a 47               inc     edi
        7802b22b 38c4             cmp     ah,al
        7802b22d 7418             jz      memicmp+0x4a (7802b247)
        7802b22f 38fc             cmp     ah,bh
        7802b231 7206             jb      memicmp+0x3c (7802b239)
        7802b233 38dc             cmp     ah,bl
        7802b235 7702             ja      memicmp+0x3c (7802b239)
        7802b237 02e6             add     ah,dh
        7802b239 38f8             cmp     al,bh

   *----> Stack Back Trace <----*

   FramePtr ReturnAd Param#1  Param#2  Param#3  Param#4  Function Name
   07bbeb4c 10011156 00000000 1003a8bc 00000009 0000005e msvcrt!memicmp
   07bbecec 1001aa84 07bbed0c 07bbee48 00000002 02151dc0
   ChatSvc!CIrcUser::CommandMessage