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PS3 LV2_Kernel Exploit Sample Implementation By Naehrwert


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96w 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.

From Mathieulh (via pastebin.com/naxXkv3M):

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!!! ^^

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






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PS3 News's Avatar
#9 - PS3 News - 137w ago
Today Naehrwert has released PS3 SCETool v0.0.4 for those interested.

Download: [Register or Login to view links]

From his Tweet (twitter.com/#!/naehrwert/status/145481343411830784) the changes are as follows:

scetool 0.0.4 [Register or Login to view links]

(added 32 bit ELF "unselfing")

isoldr_emulate [Register or Login to view links]


Bartholomy's Avatar
#8 - Bartholomy - 137w ago
Eidtool is what we need, rest is useless I think

PS3 News's Avatar
#7 - PS3 News - 138w ago
Below are some more updates from naehrwert for those following..

scetool 0.0.3 [Register or Login to view links]

output for vsh.self pastie.org/2958961


Added ELF64 support to scetool!

but I extended eidtool by some new functions

PS3 News's Avatar
#6 - PS3 News - 138w ago
Here is a follow-up from his blog today as well for those following: nwert.wordpress.com/2011/11/29/about-spu-channels-64-72-and-73/

If you are reversing the PS3′s isolated SPU modules, you will eventually notice channels 64, 72 and 73. Here are some C functions, that roughly describe how they work:

About SPU channels 64, 72 and 73



It seems that lv1ldr is storing it’s version into a special storage area.


And e.g. isoldr reads the version from the storage area and compares it to it’s own version. If the check fails, isoldr will just stop execution.


I wonder what else is stored in the area and how long the data in it persists, so my next idea is to code an isolated elf, that allows me to specify the value written to channel 64 and then dumps the data from channel 73.

Ezio's Avatar
#5 - Ezio - 138w ago
Friday is a new legal application developed by naehrwert to remarry bd drive.

shame he will never release the eid tool
Yeah, unfortunately he decided to not share his eid tool when it will be ready.

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