The Complete Metasploit Guide

Gathering the essentials

Let's look at the following table that highlights all the necessary values and their usage:

Serial number	Variable	Value
1	Offset value	2048
2	Known location in memory containing POP-POP-RETN series of instructions/P-P-R address	0x0000583b
3	Backward jump/long jump to find the shellcode	\xe9\x85\xe9\xff\xff
4	Short jump/pointer to the next SEH frame	\xeb\xf9\x90\x90

 

We now have all the essentials to build the Metasploit module for the BSplayer 2.68 application. We can see that the author has placed the shellcode precisely after 2048 NOPs. However, this does not mean that the actual offset value is 2048. The author of the exploit has placed it before the SEH overwrite because ...