full-disclosure - MS05-021 Microsoft Exchange X-LINK2STATE Heap Overflow PoC

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Message-ID: <036997811EB7544FA56BA63A1B699B8B1A9081@APOLLO.il.corp.radware.com>
Date: Tue Apr 19 17:49:09 2005
From: EvgenyP at Radware.com (Evgeny Pinchuk)
Subject: MS05-021 Microsoft Exchange X-LINK2STATE Heap
	Overflow PoC

Vulnerability Details
=====================
The vulnerability is a heap overflow in SvrAppendReceivedChunk function
which is located in xlsasink.dll.
When transmitting large chunks with X-LINK2STATE verb it is possible to
overflow the heap and perform arbitrary memory write in RtlAllocateHeap
function.
77fcc663 8901             mov     [ecx],eax              
77fcc665 894804           mov     [eax+0x4],ecx          
We are controlling ECX and EAX registers. So rewriting
lpTopLevelExceptionFilter can easily get us to our shellcode on the
heap.

Regards,

Evgeny Pinchuk 

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