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[Orpheu] Memory hack


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z0mbiland
Senior Member
Join Date: Jan 2013
Old 12-08-2014 , 19:23   Re: [Orpheu] Memory hack
Reply With Quote #11

Quote:
Originally Posted by KliPPy View Post
It is useless, all those limitations are also enforced on the client.
IT can be precached the crack on every client to download it and replace IT!!!
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YamiKaitou
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Old 12-08-2014 , 19:56   Re: [Orpheu] Memory hack
Reply With Quote #12

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Originally Posted by z0mbiland View Post
IT can be precached the crack on every client to download it and replace IT!!!
Clients do not download files they already have. Plus, the entity limit was increased last year
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teh ORiON
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Join Date: Sep 2011
Location: Denmark
Old 12-08-2014 , 21:55   Re: [Orpheu] Memory hack
Reply With Quote #13

Quote:
Originally Posted by Arkshine View Post
You answer yourself already. You can either use a signature which points to the related bytes start or getting a function address and adding n bytes to points where you want.

Once you get your address, just a matter to NOP all related bytes with 0x90.

I don't know the context and don't know much about assembly, so for a simple call in linux you will have E8 X X X X where X X X X is the function address. So you need to NOP these 5 bytes. There are probably tips to not necessary replace all to 90's but don't know. You may have to care about function with arguments, you will have some bytes before and you could corrupt the stack easily depending what you do/how is called the function.
Can you give an example on how you NOP the bytes in orpheu? Im not sure how to do it.
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teh ORiON
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Old 12-08-2014 , 22:05   Re: [Orpheu] Memory hack
Reply With Quote #14

Quote:
Originally Posted by YamiKaitou View Post
Clients do not download files they already have. Plus, the entity limit was increased last year
How much was it increased?
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Old 12-08-2014 , 22:12   Re: [Orpheu] Memory hack
Reply With Quote #15

Quote:
Originally Posted by teh ORiON View Post
How much was it increased?
Increased to 1800 for CS1.6
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GuskiS
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Old 12-09-2014 , 04:17   Re: [Orpheu] Memory hack
Reply With Quote #16

Quote:
Originally Posted by YamiKaitou View Post
Precache limit stayed the same(512).
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z0mbiland
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Old 12-09-2014 , 04:42   Re: [Orpheu] Memory hack
Reply With Quote #17

Quote:
Originally Posted by guskis View Post
precache limit stayed the same(512).
is the same, nothing changed, is 512!!!
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YamiKaitou
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Old 12-09-2014 , 11:23   Re: [Orpheu] Memory hack
Reply With Quote #18

Quote:
Originally Posted by GuskiS View Post
Precache limit stayed the same(512).
I never said it changed

Quote:
Originally Posted by z0mbiland View Post
is the same, nothing changed, is 512!!!
Yes, the Precache limit was not modified (Alfred said it would be too much of a pain to fix due to it being hardcoded in many places). You mentioned the Entity limit and that was increased.
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teh ORiON
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Join Date: Sep 2011
Location: Denmark
Old 12-09-2014 , 12:17   Re: [Orpheu] Memory hack
Reply With Quote #19

Ok, I've found a way to modify the library with IDA, however im unsure if the last instructions that add something needs to be NOP'ed as well.

Went from this:

PHP Code:
E8 52 A4 F4 FF                                  call    _VectorScale
83 C4 10                                        add     esp
10h 

To this:
PHP Code:
90                                                      nop
90                                                      nop
90                                                      nop
90                                                      nop
90                                                      nop
83 C4 10                                                add     esp
10h 
EDIT:
Tested and it works as intended!

Last edited by teh ORiON; 12-09-2014 at 13:46.
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