Tools

PegaSwitch – an exploit toolkit for the Nintendo Switch

PegaSwitch

PegaSwitch – an exploit toolkit for the Nintendo Switch

 

Setup

  1. Install Node, Python 2.7, and Ruby
  2. Open ports UDP 53 and TCP 80 and 8081 on your firewall
  3. Run npm install, pip2 install flask, gem install rubydns
  4. Start the DNS server with sudo ruby rdns.rb $yourlocalIP (drop sudo for Windows)
  5. Start the web server with sudo python serve.py
  6. Start watchify with npm start
  7. Start the shell with node debug.js
  8. Point your Switch to the DNS server
  9. Go to the eShop or another area that will trigger the captive portal
  10. Watch the shell connect

Shell

The default way to work with PegaSwitch is via the shell. Type help after the Switch connects to get a list of commands.

 

To disable the shell (and just work with the API), comment out the following line in exploit/main.js:

setupListener(sc);

API

Conventions

64-bit values (pointers, primarily) are represented using a JavaScript array containing [lo, hi], where each is 32-bit.

Utility Functions

  • paddr(address) — Convert a 64-bit value into a hex string representation
  • add2(a, b) — Adds two 64-bit values or adds a 64-bit value and a number
  • nullptr(address) — Returns true if the given 64-bit value is 0
  • eq(a, b) — Returns true if the two 64-bit values are equal
  • parseAddr(address) — Takes a hex string and parses into a 64-bit value

SploitCore

Sploitcore is the centerpoint of PegaSwitch, providing all of the core functionality and most of the important API. These are all methods on the sploitcore object.

  • dumpaddr(address, count) — Takes an address and a number of 32-bit values to log
  • read4(address, offset) — Reads a 32-bit value from address + offset * 4
  • read8(address, offset) — Reads a 64-bit value from address + offset * 4
  • write4(value, address, offset) — Writes a 32-bit value to address + offset * 4
  • write8(value, address, offset) — Writes a 64-bit value to address + offset * 4
  • memview(address, size, cb) — Calls cb with an ArrayBuffer pointing to the view of memory requested. DO NOT keep that view or any object using it around; you will tank the GC and your Switch will crash
  • getAddr(obj) — Returns the address of a given JavaScript object
  • mref(offset) — Returns the address of the main module (the application binary itself) plus the given (32-bit) offset
  • getBase() — Returns the base address of WebKit
  • getSP() — Returns the current stack pointer (current as of a function call in JS), primarily useful for JOP/ROP chains
  • malloc(bytes) — Returns an address to an allocated buffer
  • free(addr) — Frees a buffer
  • bridge and call — Documented below
  • svc(id, registers, dump_regs) — Call a specific SVC, passing an array of registers and optionally dumping all regs (dump_regs == true/false)
  • getTLS() — Gets address of TLS
  • str2buf(str) — Allocates a buffer for a null-terminated string and returns the address
  • readString(addr, length) — Reads a string from addr. If length is not passed or -1, the string is expected to be null-terminated
  • gc() — Force garbage collection

Call

sploitcore.call allows you to call native functions by address. It takes the following parameters, with the first being required:

  • address – Function address. Either a 32-bit offset from the main module address, or a 64-bit absolute pointer
  • args – Array of arguments, to go in x0+
  • fargs – Array of floats, to go in d0+
  • registers – Array of raw registers (x16 and x30 not assignable)
  • dump_regs – Boolean to set whether registers should be dumped upon return

This function always returns the 64-bit value in x0.

Bridge

Bridge allows you to wrap a native function into a JavaScript function. Example:

var strlen = sc.bridge(0x43A6E8, int, char_p);
log(strlen('foo')); // Logs 3 to the console

The first parameter is the address (same format as call), second is the return type, the rest are arguments.

The following are valid types:

  • null — Used for void returns
  • int
  • void_p — Arbitrary pointer
  • char_p — String pointer
  • float — Floating point argument; currently only supported for arguments, not returns

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