Blackbox tool to disable SSL certificate validation - including certificate pinning - within iOS and OS X Apps
C Objective-C Makefile
Latest commit dc93900 Feb 24, 2016 @nabla-c0d3 Tweak README

README.md

SSL Kill Switch 2

Build Status

Blackbox tool to disable SSL certificate validation - including certificate pinning - within iOS and OS X Apps. Second iteration of https://github.com/iSECPartners/ios-ssl-kill-switch .

Description

Once loaded into an iOS or OS X App, SSL Kill Switch 2 patches specific low-level SSL functions within the Secure Transport API in order to override, and disable the system's default certificate validation as well as any kind of custom certificate validation (such as certificate pinning).

It was successfully tested against various Apps implementing certificate pinning including the Apple App Store. The first version of SSL Kill Switch was initially released at Black Hat Vegas 2012.

For more technical details on how it works, see http://nabla-c0d3.github.io/blog/2013/08/20/ios-ssl-kill-switch-v0-dot-5-released/

iOS Instructions

On iOS, SSL Kill Switch 2 can be installed as a Cydia Subtrate tweak on a jailbroken device.

WARNING: THIS TWEAK WILL MAKE YOUR DEVICE INSECURE

Installing SSL Kill Switch 2 allows anyone on the same network as the device to easily perform man-in-the-middle attacks against any SSL or HTTPS connection. This means that it is trivial to get access to emails, websites viewed in Safari and any other data downloaded by any App running on the device.

Installation

The following dependencies should be installed using Cydia:

  • Debian Packager
  • Cydia Substrate
  • PreferenceLoader

Then, download the latest pre-compiled package available in the release tab of the SSL Kill Switch 2's GitHub page. Copy it to the device, install it and respring the device:

dpkg -i <package>.deb
killall -HUP SpringBoard

There should be a new menu in the device's Settings where you can enable the extension. Finally, kill and restart the App you want to test.

The tweak can later be uninstalled using:

dpkg -r com.nablac0d3.SSLKillSwitch2

Intercepting the App Store's traffic

Lots of people have asked about how to intercept the App Store's traffic using SSL Kill Switch 2. I wrote down some instructions here: http://nabla-c0d3.github.io/blog/2013/08/20/intercepting-the-app-stores-traffic-on-ios/

Build

The build requires the Theos suite to be installed available at http://www.iphonedevwiki.net/index.php/Theos/Getting_Started .

Then, within SSL Kill Switch 2's root foler, create a symlink to your theos installation:

ln -s /<path_to_your_theos_folder> theos

Make sure dpkg is installed. If you have Homebrew, use:

brew install dpkg

Then, the SSL Kill Switch 2 Debian package can be built using:

make package

OS X Instructions

SSL Kill Switch 2 can be used in OS X Apps as a dynamic library to be injected into processes.

Usage

On OS X, the SSLKillSwitch library needs to be manually injected into the process where SSL pinning needs to be disabled. Once injected, it will automatically override and disable SSL validation.

There are several ways to do this including:

  • Starting the process with LLDB and load SSLKillSwitch using dlopen():

    (lldb) expr (void*)dlopen("/path/to/build/SSLKillSwitch.framework/Versions/A/SSLKillSwitch", 1)
    (void *) $1 = 0x00007f92e74d10c0
    
  • Using DYLD_INSERT_LIBRARIES to inject SSLKillSwitch and start the process.

Restricted Apps

TBD

Build

Use the Xcode project to build SSL Kill Switch 2 for OS X. The compiled library will then be available in Products/SSLKillSwitch.framework/Versions/A/SSLKillSwitch. This is the binary that you need to inject in the process where you want to disable SSL pinning.

Changelog

  • v0.10: Added support for proxy-ing CocoaSPDY Apps (ie. Twitter iOS).
  • v0.9: Extended the MobileLoader filter to simplify the proxy-ing of the Apple App Store application.
  • V0.8: Added support for iOS 9.
  • v0.7: Renamed tool to SSL Kill Switch 2; added support for OS X Apps and TrustKit.
  • v0.6: Added support for iOS 7.
  • v0.5: Complete rewrite in order to add support for proxy-ing Apple's App Store application.
  • v0.4: Added hooks for SecTrustEvaluate().
  • v0.3: Bug fixes and support for iOS 6.
  • v0.2: Initial release.

License

MIT - See ./LICENSE.

Author

Alban Diquet - @nabla_c0d3