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The only difficulty is finding an address that holds a pointer to our code We need to ensure that EDI+ECX*4+4 matches this address so that the pointer to our code is moved into EAX and then called The first time svchost is exploited, the location of the Thread Environment Block (TEB) and the location of the stack are always consistent Needless to say, with a busy server, neither of these may be so predictable Assuming stability, we could find a pointer to our EXCEPTION_REGISTRATION structure at TEB+0 (0x7FFDB000) and use this as our location where we can find a pointer to our code But, as it happens, just before the exception handler is called, this pointer is updated and changed, so we cannot use this method.

Last, let s take a look at a more complicated example. The code shows how a simple C function looks in assembly. If you can easily understand this example, you are probably ready to move forward to the next chapter.

Electromagnetic wave properties in various propagating materials 0.85 cm 6.6 10 3 cm 32.5 m 2.5 cm 4590 m 240 m eff (V/A) 2.9 10 6 3.7 10 3 10.1 10 3 14.1 0.49 19.9 45 45 45 39.3 44.9 0.013 up (m/s) 3.2 4153 1.7 108 7.8 107 5.5 105 5.7 107

The EXCEPTION_REGISTRATION structure that TEB+0 does point to, however, at address 0x005CF3F0, has a pointer to our EXCEPTION_REGISTRATION structure, and because the location of the stack is always consistent the first time the exploit is run, then we can use this There s another pointer to our EXCEPTION_REGISTRATION structure at address 0x005CF3E4 Assuming we ll use this latter address if we set 0x0C past our EXCEPTION_REGISTRATION structure to 0x40001554 (this will go into ESI) and 0x08 bytes past it to 0x005BF3F0 (this will go into EDI), then after all the multiplication and addition we re left with 0x005CF3E4 The address pointed to by this is moved into EAX and called On EAX being called we land in our EXCEPTION_REGISTRATION structure at what would be the pointer to the next EXCEPTION_REGISTRATION structure.

(7.23)

If we put code in here that performs a short jmp 14 bytes from the current location, then we jump over the junk we ve needed to set to get execution to this point We ve tested this on four machines running Windows 2003 Server, three of which were Enterprise Edition and the fourth a Standard Edition All were successfully exploited We do need to be certain, however, that we are running the exploit for the first time otherwise it s more than likely to fail As a side note, this exception handler is probably supposed to deal with Vectored handlers and not frame-based handlers, which is why we can abuse it in this fashion..

simple: extra dimensions were infested with demons Stay away from such bizarre realms if at all possible, the show s message strongly urged Indeed in one of the subsequent episodes, Little Girl Lost, a curious girl falls through a trans-dimensional portal in her bedroom and, to her parents horror, becomes trapped Her fate exemplified the lesson that hyperspace contact is not child s play These themes came as no surprise to the aficionados of the stories upon which many of the episodes were based From the 1930s until the 1950s, science fiction was in a golden age, signaled by a proliferation of pulp magazines such as Weird Tales, Astounding ScienceFiction, and Amazing Stories The speculative stories contained in these pages were the imaginative successors of the epics of Wells, Verne, and others They enriched some of the older ideas with more up-to-date scientific references.