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PS3 LV2_Kernel Exploit Sample Implementation By Naehrwert


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114w 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 266 Comments - Go to Forum Thread »

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BaSs H4X0R's Avatar
#236 - BaSs H4X0R - 5w ago
Dope. Thanks for this.

steel2020's Avatar
#235 - steel2020 - 6w ago
thanks for the download

I hope that it will be useful for me.

mierda25's Avatar
#234 - mierda25 - 22w ago
Those links are down

BerserkLeon's Avatar
#233 - BerserkLeon - 32w ago
Try a 0byte file? Exception.

scratch my last comment, here i was assuming that [klic] was text entry instead of a file read operation.

klic's 32 0's: [Register or Login to view links]

oh silly me, I uploaded the wrong one. Oh well, it has the same properties as the bgm0000002 one, free and edat v4. same error.

... Well now I feel stupid. The error was because I opened it in notepad++ and typed 32 0s.
klic is to be read from a file that is compiled with a hex editor. So I opened HxD and wrote one line of 0s, and now it works.
Brilliant. Another PEBKAC, I think I should think and do a bit more trial and error before typing.
Much thanks to User and Belmodo, I've been obsessing over this most of the weekend.

PS3 News's Avatar
#232 - PS3 News - 32w ago
Today PlayStation 3 developers user and Belmodo have made available NPDTool PS3 EDAT / SDAT Tool v4 Final with the changes outlined below.

Download: [Register or Login to view links] / [Register or Login to view links] / [Register or Login to view links]

To quote: Hi, Belmondo and me thought it would be time to just drop this here.

Enjoy

PS: extracting compressed edat/sdat is supported, creating isn't. However, you can finalize compressed debug edat/sdat.

Edit: ofc creating and extracting uncompressed edat works as well... let me know if there are any issues. it works with every file i tried.

Credits: JuanNadie

Previous Revisions:

Update 4d:

  • decompression fix

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