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05
November

The effect of disclosure

Written by Davee. 2 comments Posted in: Davee's Stuff

Once again, I’ve not posted in a while, so I’ll start off my apologising for that. Today, I’m gonna talk about the reality of computer security. When I say reality, I immediately put my hands up and say that I’m talking bullshit and really just gonna spew a lot of my opinion in regards to computer security. So, here goes… (more…)

12
July

ClipUpload SCP

Written by Davee. 1 comment Posted in: Davee's Stuff

Today is a short post, but I’ve recently started playing around with ClipUpload. ClipUpload is a very clever, yet very simple clipboard upload tool which will upload whatever is in your clipboard to a variety of sources including: facebook, imgur, pastebin or even your own FTP server.

Whilst I think it is pretty cool to upload to an FTP server, I’d much rather have the ability for a secure transfer. That being said, I forked the code and with the help of SharpSSH I modified the FTP addon and produced a fully working SCP addon.

So, if you use clip upload, give it a try (especially if you prefer secure transfers). If not, you should give it a try, it’s a really useful application.

ClipUpload SCP Fork: https://github.com/DaveeFTW/ClipUpload

This will be a small introduction into return oriented programming, commonly referred to as ROP. I’ve had a lot of experience with security measures (duh) but never really had any hands on experience with more modern security technologies such as non-executable stack/data (DEP, NX, XN, W^X) or Address Space Layout Randomisation (ASLR).

The non-executable stack isn’t really limited to just the stack, anything that isn’t code memory can’t be executed. So as in PSP, you can’t just jump to the savedata and have the day’s work done. No, instead the only code executable is real code provided by the OS when binaries are loaded. This is a nice and funky way but ROP is the counter and tends to poop on this method.

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02
September

Just to start, congratulation to yifanlu for his excellent work on gaining the first vita native hack. I’d like to note that I’m just relaying information from a forum post by yifanlu and did not have any input on yifanlu’s work, it’s all his!

Also, if you’re not a developer, please note that there is currently no way to run homebrew, colour your screen, download binaries, hack your device, make a milkshake from 10 miles away or such. This post is purely informational.

Continuing on, considering my audience gathers quite a few developers I think this post should complement the cause. So, if you don’t know, vita dev yifanlu has been looking around for developers who are interested in developing native software on the vita. He is calling out for developers to help him develop an ELF loader. (more…)

25
August

Well, this place has been cleaned up a little bit and I can log back in again. You might of noticed that I’ve changed the theme, and you’ll probably find out that I do this often!

Well this post is going summarise what the hell I’ve been doing since my last post in terms of development and perhaps you’ll be disappointed. Follow the link and find out!  (more…)

29
March

Kermit

Written by Davee. 22 comments Posted in: Uncategorized

Turns out he’s not just a green frog! So, I’ve been throwing this word around recently and it’s probably about time I explain. Kermit, either a protocol or perhaps a funny name (see KIRK/SPOCK) is a communication interface for the PSP emu. Specifically it allows the PSP to talk to the host.

Now, I can tell there aren’t as many developers here, so I’ll try to simplify for the curious minds but this stuff is pretty complicated. I’ll only explain the API in detail as the lower level still need a little bit of clearing up, but here goes.  (more…)

21
March

First thing first, huge thanks to Proxima and some1. They’ve provided key utilities and advice for this research. So, yeah, it was really only a matter of time till this kind of thing happened. Sony dont just emulate the userland process of a PSP game, they emulate the entire kernel albeit, a modified kernel. The PSP emu has limited access to hardware, with interfacing the hardware done via a Kermit module. Kermit is a old-timers transmission protocol, likely used to talk to the native Vita. (more…)

03
December

Thanks to a facebook message from my dad yesterday, I was informed of this website: Can you Crack it?. So, promptly, I got onto the job and it was surprisingly easy and I imagine it will be for most people who can reverse engineer and has experience doing so.

Click read more to see how I did it, but I suggest you have a good attempt beforehand. It’s a nice little reverse engineering exercise.
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As an ongoing project, me and some1 have been enhancing this downgrader from birth on the 6.31/6.35 firmwares. This multi-firmware downgrader allows you to install a lower (or higher) firmware without any fuss. No complex flash0 sharing, just running the firmware update.
However, there comes restriction with PSP models and compatible firmware. For example, a PSPgo cannot run 1.50 as there are no drivers for the system and the IPL format is incompatible. Much like this, the PSP 3000 09g is unable to install firmwares < 6.30 which removes it’s ability to appreciate the flexibility of permanent custom firmware.

This is no longer the case.
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15
July

Emma is not well :(

Written by Davee. 64 comments Posted in: Davee's Stuff

It sucks, my beautiful girlfriend’s fallen pretty ill and I want her to get real better soon. If you could spare some time I’d appreciate if you’d drop a comment. Hopefully she’ll be up and running soon again!

She’s suffering from some migraines and it’s causing her a lot of pain. Leave something to help cheer her up, it’ll mean a lot to me!

Love you Emma :D <3
Cheers guys.