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Tutorial – WiiU: Haxchi Installation

We recently about the prospect of Nintendo releasing an update for the wiiU. There was also reports of the current update blocker DNS servers going offline.

It’s time to take your wiiU offline and just stay safe while this storm passes.

You can avoid the DNS woes that have been going around and know that your wiiU will be able to be modded with the latest and greatest when the devs release their homebrews.

We also mentioned that you should get a DS VC game ASAP. Well, if you haven’t there’s still time and you can do it now while following our tutorial below!

Here is our tutorial on how to install Haxchi to your WiiU which will allow you to enter into the homebrew launcher without the need of an internet connection.

WiiU: Haxchi Installation

“Haxchi is an exploit for the Nintendo DS virtual console emulator on Wii U (hachihachi). It was originally made for Kirby Squeak Squad. Theorically, all DS virtual console games can be exploited. It is possible due to “contenthax”, a vulnerability in the wii u’s title integrity design: only code and critical descriptors are signed, with all other contents left at the mercy of attackers. this can be exploited simply by asking IOSU to copy over files in /content/ directories on either MLC or USB. contenthax can also be exploited from powerpc userland by using the MCP_CopyTitle command (not all processes have access, but for example home menu and system settings have it). as there is no integrity data for that content, CopyTitle cannot validate the malicious content and will therefore happily copy it from SD card to MLC or USB if asked.

it is likely that virtually all apps can be exploited in some way through contenthax, due to developers being less likely to program defensively against content that they should be the only ones to have control over. the Nintendo DS virtual console app was selected for this exploit because it has the ability to dynamically emit executable code. as a nice bonus, hachihachi includes symbols for its code. haxchi exploits a bug in the emulator’s rom loader, and basically gets it to perform arbitrary memcpy operations. from there, achieving code execution is trivial given that there is no ASLR in place.

note that haxchi was smea’s first time doing PPC ROP so… yeah”
credit

smea, plutoo, yellows8, naehrwert, derrek, FIX94 and dimok

Original thread

Discuss this in the ML forums
———————————————-
Things you will need to do this

WiiU

SD card

Nintendo eshop points

1 of these DS VC games

Haxchi

7zip


Any video tutorials are created for educational purposes only. ModzLink does not condone the use of any electronics for malicious activity.

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