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iOS SSL Kill Switch

Blackbox tool to disable SSL certificate validation - including certificate pinning - within iOS Apps.

Description

Once installed on a jailbroken device, iOS SSL Kill Switch patches low-level SSL functions within the Secure Transport API, including SSLSetSessionOption() and SSLHandshake() 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. iOS 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/

WARNING: THIS TWEAK WILL MAKE YOUR DEVICE INSECURE

Installing this tweak 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

Users should first download the latest pre-compiled Debian package available in the release section of the project page at: https://github.com/iSECPartners/ios-ssl-kill-switch/releases

The tool was tested on iOS7 running on an iPhone 5S.

Dependencies

iOS SSL Kill Switch will only run on a jailbroken device. Using Cydia, make sure the following packages are installed:

• dpkg
• MobileSubstrate
• PreferenceLoader

How to install

Download and copy the Debian package to the device; install it:

dpkg -i <package>.deb

Respring the device:

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.

How to uninstall

dpkg -r com.isecpartners.nabla.sslkillswitch

Intercepting the App Store's traffic

Additional instructions are available here: http://nabla-c0d3.github.io/blog/2013/08/20/intercepting-the-app-stores-traffic-on-ios/

Build

Most users should just download and install the Debian package. The build requires the Theos suite to be installed; see http://www.iphonedevwiki.net/index.php/Theos/Getting_Started . You first have to create a symlink to your theos installation:

ln -s /opt/theos/ theos

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

brew install dpkg

Then, the package can be built using:

make package

Changelog

• 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.txt

Author

Alban Diquet - https://github.com/nabla-c0d3