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PS3 LV2_Kernel Exploit Sample Implementation By Naehrwert


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118w 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 275 Comments - Go to Forum Thread »

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#110 - Ausdim - 111w ago
Ausdim's Avatar
Hello.

In the new v0.3.5 i dont see the option to sign only the EBOOT.BIN file.

So i edit a little the bat to search first if any EBOOT.BIN are in root of app folder.

Just replace the CFW 4.xx .pkg Resigner Script START.bat

Thanks

#109 - wega - 111w ago
wega's Avatar
excellent guide perfect...

#108 - zeroblu3 - 111w ago
zeroblu3's Avatar
Quote Originally Posted by PS3 News View Post
Cheers for the final update zeroblu3, I have now mainpaged it as well and +Rep!


Thanks again

#107 - PS3 News - 111w ago
PS3 News's Avatar
Cheers for the final update zeroblu3, I have now mainpaged it as well and +Rep!

#106 - zeroblu3 - 111w ago
zeroblu3's Avatar
Following up on my previous revisions, I now present the final release of my PS3 CFW 4.XX+ .PKG Resigner Script v0.3.5 with the changes below.

Download: [Register or Login to view links]

CFW 4.xx .pkg Resigner Script v0.3.5 Changelog:

  • added error messages with description of the problem
  • script resets folders on finish
  • script resets folders on error
  • moved code to one .bat script
  • added timeouts to improve stability
  • improved UI and strings

Usage:

1. Extract folder inside the .rar
2. Run CFW 4.xx .pkg Resigner Script START.bat
3. Follow onscreen instructions

Enjoy

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