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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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zeroblu3's Avatar
#101 - zeroblu3 - 107w ago
done some more testing with homebrews and found a bug that will cause the script to fail while moving the folders when those have spaces in it.

here is a quick fix, please report back if you find more bugs

i'll go get some rest now ^^

cya later

zeroblu3's Avatar
#100 - zeroblu3 - 107w ago
yet another update... sorry guys ^^ was kinda tired and the code was really a mess.

Changes in 0.3.3b

  • Changed title in the script from 0.3.1b to 0.3.3b to avoid confusion
  • Removed a file from testing that wasn't needed
  • Uncluttered the code to make it run smoother and make it more readable
  • Changed strings.
  • Some minor adjustments

Quote Originally Posted by Roaf View Post
Is there any eboot resigner? Cuz Its hard to find original eboots for 4.30CFW.

if you are looking for a disk eboot resigner i would suggest TrueAncestor EBOOT Resigner.

Roaf's Avatar
#99 - Roaf - 107w ago
Is there any eboot resigner? Cuz Its hard to find original eboots for 4.30CFW.

PS3 News's Avatar
#98 - PS3 News - 107w ago
All in a day's work hehe, I updated the article with the new revision and link to the changes as well. Cheers!

zeroblu3's Avatar
#97 - zeroblu3 - 107w ago
Quote Originally Posted by PS3 News View Post
I have now promoted your script to the main page and +Rep zeroblu3!


OMG O_O that's awsome thanks a lot

p.s. i just noticed some unneeded lines in the code and files i left over fom the testing so i decided to remove them and reuploaded the updated version

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