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Kxploit question

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m0skit0
Guru
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Re: Kxploit question

Post by m0skit0 »

fidelcastro wrote:or by jumping to kernel addresses in user mode
Of course you can jump to kernel addresses from user-mode, otherwise it would make no sense. You jump from user to kernel using SYSCALL MIPS instruction. This is how you exploit kernel flaws and this is why you need a user-mode exploit first. When you get user-mode exploit, you can then call SYSCALL on the vulnerable kernel service and get your code execute with kernel privileges.
fidelcastro wrote:nothing, continue with our pitiful existence
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I wanna lots of mov al,0xb
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"just not into this RA stuffz"
FrEdDy
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Re: Kxploit question

Post by FrEdDy »

You "believe" it's possible to gain kernel mode with an user mode exploit, but it's not.
/thread
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some1
HBL Collaborator
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Re: Kxploit question

Post by some1 »

FrEdDy wrote:You "believe" it's possible to gain kernel mode with an user mode exploit, but it's not.
/thread
Not directly, but through a kernel mode exploit you can ;)

The only possible way I see this happening is if you change data in the savedata that is later passed to a kernel mode function which had a bug/sploit in. it Hence using save data to gain kmode xP
In theory, you can skip the "User mode exploit" if you can just pass data directly from savedata to game code which calls a kmode function, but then again, some people might call just that a "user mode exploit".
way to keep a secret malloxis...erm jeerum
Hmm, a demo user mode exploit doesn't seem as important anymore, I wonder why... xP
m0skit0
Guru
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Re: Kxploit question

Post by m0skit0 »

You're right some1, it's theoretically possible to have a kxploit directly from a user-mode function, but there should be a lot of coincidences, and AFAIK this has not been seen on PSP already.
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fidelcastro
Posts: 215
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Re: Kxploit question

Post by fidelcastro »

so maybe if possible, difficult but not impossible, perhaps a kernel memory dump can tell us something

Code: Select all

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0001303B 00 20 20 2D 2D 20 20 28 4E 61 6D 65 29 3A 20 25 33 31 73 2C 20 28 55 49 44 29 3A 20 30 78 25 30 38 78 2C 20 28 61 74 .  --  (Name): %31s, (UID): 0x%08x, (at
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000130FE 6C 20 25 64 29 0A 00 00 00 00 30 31 32 33 34 35 36 37 38 39 61 62 63 64 65 66 00 00 00 00 30 31 32 33 34 35 36 37 38 l %d).....0123456789abcdef....012345678
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000133BC 00 00 00 00 F9 FF 32 00 C4 01 10 13 1B 00 08 07 09 06 0A 05 0B 04 0C 03 0D 02 0E 01 0F 00 00 00 00 00 18 00 C8 00 00 ......2................................
000133E3 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 E7 FF D0 FF C0 FF B0 FF A0 FF 90 FF 80 FF .......................................
0001340A 70 FF 60 FF 5F FF 3F FF 1F FF FF FE D7 FE 97 FE 57 FE 17 FE DB FD 5B FD DB FC 5B FC D3 FB D3 FA D3 F9 D3 F8 DD F7 DD p.`._.?.........W.....[...[............
00013431 F5 DD F3 DD F1 E0 EF FF FF FF FF 00 00 01 00 02 00 03 00 04 00 06 00 08 00 0C 00 10 00 18 00 20 00 30 00 40 00 60 00 ............................... .0.@.`.
00013458 80 00 C0 00 00 01 80 01 00 02 00 03 00 04 00 06 00 08 00 0C 00 10 00 18 00 20 00 30 00 40 00 60 FB FF FB FF 00 00 00 ......................... .0.@.`.......
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000134F4 A4 3D 00 88 B0 3D 00 88 BC 3D 00 88 C8 3D 00 88 D4 3D 00 88 E0 3D 00 88 EC 3D 00 88 F8 3D 00 88 D9 D2 10 D3 F8 75 00 .=...=...=...=...=...=...=...=.......u.
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00013653 42 42 42 42 42 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 10 10 10 10 20 00 00 00 08 DB 00 88 E8 E1 BBBBB........................ .........
0001367A 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 .......................................
000136A1 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 .......................................
000136C8 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 88 E8 E1 00 .......................................
m0skit0
Guru
Posts: 3817
Joined: Mon Sep 27, 2010 6:01 pm

Re: Kxploit question

Post by m0skit0 »

Almost impossible. You would need to RE that kernel part, and most likely it will be nothing of interest. What you posted is totally useless, that's a data section (specifically PRX library info). Forget about it. Just go for the user-mode exploit.
I wanna lots of mov al,0xb
Image
"just not into this RA stuffz"
fidelcastro
Posts: 215
Joined: Sat Oct 02, 2010 1:34 pm

Re: Kxploit question

Post by fidelcastro »

this is simply trying to learn, I'm not looking for anything, but say it is difficult for existing protection from user mode to kernel mode?
m0skit0
Guru
Posts: 3817
Joined: Mon Sep 27, 2010 6:01 pm

Re: Kxploit question

Post by m0skit0 »

Learn programming first. Sorry but I'm sick of losing time with the same thing again and again, fidel. You know what I mean.
I wanna lots of mov al,0xb
Image
"just not into this RA stuffz"
fidelcastro
Posts: 215
Joined: Sat Oct 02, 2010 1:34 pm

Re: Kxploit question

Post by fidelcastro »

Nor are questions exclusively for you
FrEdDy
HBL Collaborator
Posts: 243
Joined: Mon Sep 27, 2010 7:08 pm
Contact:

Re: Kxploit question

Post by FrEdDy »

some1 wrote:
FrEdDy wrote:You "believe" it's possible to gain kernel mode with an user mode exploit, but it's not.
/thread
Not directly, but through a kernel mode exploit you can ;)

The only possible way I see this happening is if you change data in the savedata that is later passed to a kernel mode function which had a bug/sploit in. it Hence using save data to gain kmode xP
In theory, you can skip the "User mode exploit" if you can just pass data directly from savedata to game code which calls a kmode function, but then again, some people might call just that a "user mode exploit".
Only time kernel should be involved is when the data is loaded (I don't think the game should pass data to the kernel directly, I can't even see why), and I think that part of the kernel is pretty secure and had been checked hundreds of times.
https://github.com/freddy-156
<@n00b81> FREDDY CUTTIES
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