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.
=====================
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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