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- #Hack run zero deactivation code for mac os x#
- #Hack run zero deactivation code 64 Bit#
- #Hack run zero deactivation code update#
- #Hack run zero deactivation code full#
- #Hack run zero deactivation code software#
We can set the first item in the chain to 0xa0000 and the next item to any desired value for rax. ROP chains aren't just limited to a list of addresses though assuming that from 0xa0000 contains these instructions:
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If we overwrite a return address on the stack to contain 0x80000 followed by 0x90000, then as soon as the first ret instruction is reached execution will jump to mov rax, 0, and immediately afterwards, the next ret instruction will pop 0x90000 off the stack and jump to mov rbx, 0.Įffectively this chain will set both rax and rbx to 0, just as if we had written the code into a single location and executed it from there.
#Hack run zero deactivation code 64 Bit#
In x86_64 assembly, when a ret instruction is reached, a 64 bit value is popped off the stack and rip jumps to it since we can control the stack, we can make every ret instruction jump to the next desired gadget.įor example, from 0x80000 may contains instructions:Īnd from 0x90000 may contain instructions: Return-Oriented Programming (ROP) is just an extension to traditional stack smashing, but instead of overwriting only a single value which rip will jump to, we can chain together many different addresses, known as gadgets.Ī gadget is usually just a single desired instruction followed by a ret. It wouldn't be very useful to jump to a single address if we can't write our own code to that address, so we use ROP. However, we can execute code that is already loaded into memory and marked as executable. This means that we can't just copy a payload into memory and execute it. Pages of memory which are marked as executable cannot be overwritten, and pages of memory which are marked as writable cannot be executed this is known as Data Execution Prevention (DEP). Unlike in primitive devices like the DS, the PS4 has a kernel which controls the properties of different areas of memory. If you have never signed into PSN, your PS4 won't be able to open the Internet Browser, however you can go to "Settings", and then "User's Guide" to open a limited web browser view which you can control the contents of with a proxy. Since then, many other vulnerabilities have been found in WebKit, which could probably be used as an entry point for later firmwares of the PS4, but as of writing, no one has ported any of these exploits to the PS4 publicly. This gives us arbitrary read and write access to everything the WebKit process can read and write to, which can be used to dump modules, and overwrite return addresses on the stack, letting us control the instruction pointer register ( rip) to achieve ROP execution.
#Hack run zero deactivation code for mac os x#
In 2014 nas and Proxima announced that they had successfully been able to port an exploit using this vulnerability, originally written for Mac OS X Safari, to the PS4's internet browser, and released the PoC code publicly as the first entry point into hacking the PS4. In particular, the browser in PS4 firmware 1.76 uses a version of WebKit which is vulnerable to CVE-2012-3748, a heap-based buffer overflow in the JSArray::sort(.) method. WebKit is the open source layout engine which renders web pages in the browsers for iOS, Wii U, 3DS, PS Vita, and the PS4.Īlthough so widely used and mature, WebKit does have its share of vulnerabilities you can learn about many of them by reading Pwn2Own write-ups.
#Hack run zero deactivation code software#
Most notably, the PS4's Orbis OS is based on FreeBSD (9.0), just like the PS3's OS was (with parts of NetBSD as well) and includes a wide variety of additional open source software as well, such as Mono VM, and WebKit.
#Hack run zero deactivation code update#
If you are on an older firmware and wish to update to 1.76, you may download the 1.76 PUP file and update via USB.Īs well as having a well documented CPU architecture, much of the software used in the PS4 is open source. You may download my complete setup here to run these tests yourself it is currently for firmware 1.76 only.
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If you are not particularly familiar with exploitation, you should read my article about exploiting DS games through stack smash vulnerabilities in save files first.
#Hack run zero deactivation code full#
The goal of this series will be to present a full chain of exploits to ultimately gain kernel code execution on the PS4 by just visiting a web page on the Internet Browser. I will explain some security concepts that generally apply to all modern systems, and the discoveries that I have made from running ROP tests on my PS4. Since there haven't been any major public announcements regarding PS4 hacking for a long time now, I wanted to explain a bit about how far PS4 hacking has come, and what is preventing further progression. See also: Analysis of sys_dynlib_prepare_dlclose PS4 kernel heap overflow