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PS3 LV2_Kernel Exploit Sample Implementation By Naehrwert


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117w ago - Following up on his PS3 SCETool update and PS3 Dump_Rootkey code, today Sony PlayStation 3 hacker Naehrwert has posted some details on exploiting the PlayStation 3 lv2_kernel and has made available a sample 3.41 implementation below.

To quote from his blog: Exploiting (?) lv2

A long while ago KaKaRoTo pointed me to a stack overflow he found while reversing lv2_kernel. But there are two problems:

1. The vulnerability is in a protected syscall (the SELF calling it got to have the 0x40... control flags set). So you’d first need to find a suitable usermode exploit (don’t ask us), that gives you code execution with the right privileges.

2. The payload data is copied to lv2 heap first and the function will do a free call on it before the payload has any chance to get executed. This might not sound like a problem but it looks like lv2′s heap implementation will overwrite the free’ed space with 0xABADCAFE and thus destroy the payload.

Here (pastie.org/4755699) is my sample implementation for 3.41 lv2_kernel (although the vulnerability should be present in all versions of lv2 up to the latest firmware), maybe someone of you will find a way to overcome problem (2.) and can get something nice out of it because right now it’s only good to crash lv2.

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From Mathieulh (via pastebin.com/naxXkv3M):

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The footer signature is still not checked upon npdrm self files execution as of 4.21.

Because kakaroto says something that doesn't make it true. Basically he found a check in 3.55 that was not even called and assumed they used it in 3.60+.

Of course they do whitelist npdrm now so even if the footer isn't checked you cannot run your own npdrm selfs signed with keyset lower than 0x0D making the whole debate rather pointless. Aditional checks are now performed on the actual file format as well such as the segment counter flag that needs to be set to 0x01 except for the very last segment.

Finally, from KDSBest (via twitlonger.com/show/jcmh80): Since naehrwert posted an lv2 exploit I will do so too . The stack pointer points to lv2 and if we do a syscall, the syscall saves register to the stack HAHA.

Btw. It just crashes the console for now, since I totally overwrite dump the lv2 or some memory addresses I don't know. Feel free to try around, adjust the address of the stackpointer and so on. If you managed to get the panic payload executed. Tell me!!! ^^

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I didn't managed to make it work on 4.21 so I just did on 4.20






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Comments 272 Comments - Go to Forum Thread »

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#57 - darkhellsatan - 112w ago
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Hello, first thanks for your work, about actual (and discontinued) homebrew, somebody knows how to resign to work in 4.1; What i mean? a software or procedure to take a pkg, decrypts, resign (or do the required modifications to work in 3.6+ FW) and encrypt again to be able to install and full work in 4.21 CFW.

#56 - iCEQB - 112w ago
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Thats the private key for appldr from firmwares 0.92-2.36. And


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might be correct, as 3.56 was the last version with the ECDSA fail from sony.

Hmm nope, I was wrong, 3.55 was the last time we could get the private keys for games. We don't know any private keys from games that got encrypted with the 3.56 keyset. We can only decrypt them and ONLY encrypt them for FWs up to 3.55.

#55 - cfwprophet - 112w ago
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Hmm...you sure ? Well look at this and test it if you want :

app-priv-360:
00040AB47509BED04BD96521AD1B365B86BF620A98

or this one:

app-priv-356:
7D583155485C3C7E3E6F626A4A4D4351322C444136

I never tested 3.60 or 3.56 priv key and 3.60 looks strange to me (first byte 0x00) but i know there is a priv 3.60 key. If this one don't work just search on dev wiki or on a git site of some one other which also have those keys

#54 - iCEQB - 112w ago
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Am I missing something here? How does he want to resign anything with 3.60 keys?

We don't (and probably never again will) have the private keys to sign / resign any game.

#53 - PS3GAMER20111 - 112w ago
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Mediafire Link For PS3 4.21 EBOOT Resigner SCETool Script

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ENJOY

 

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