PSP 3000 Jailbreak emergence

From the Forum player "MaTiAz", PSP early game "burst racing" game archive data overflow errors exist, MaTiAz edited a copy of special archive data with this loophole, and successfully run portion of the archive code. The author recorded the process with a video presentation, the video show the PSP screen turn blue at the end. The "Hello World" program whihch created by using this loophole has also emerged. Following is the "Hello World" video presentation. In addition PSP3000 specialized SDK "Sparta SDK" (Sparta SDK) has also been announced.




"Hellow World"

Quote:

So, happy new year. I think presenting a new usermode exploit on the PSP is a good way to start 2009

GripShift has a buffer overflow vulnerability when loading savegames. The savegame contains the profile name which can be easily used to overwrite $ra.

The savegame file is pretty big (25kB) so you have lots of space to put your code there. I wrote a simple blob of code to paint the framebuffer completely white (to just indicate that arbitrary code is running ).

The return address is located at offset 0xA9 in the file. In this poc it points to 0x08E4CD50 (which is only a few bytes after the return address), and the code starts at 0xCC in the file.

It was tested on 4.01M33-2 with US version of GripShift (ULUS10040), and psplink.prx, usbhostfs.prx and deemerh.prx loaded (also without psplink and usbhostfs). The decrypted savegame (sorry, couldn't [be bothered to] get Shine's savegame tool working so it's in plaintext form) is in the SDDATA.BIN form which Hellcat's Savegame-Deemer produces (thanks to him, if the program didn't exist I wouldn't have bothered with this. ). Just copy the ULUS10040SAVE00 directory to /PSP/SAVEPLAIN/ and run the game. EDIT: yeah, don't forget to have Savegame-Deemer working, duh.

Credits go to those who deserve them.