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Subverting iOS Data Protection: A Step-by-Step Guide to Cracking Passcodes

This guide details the method for bypassing iOS data protection by cracking passcodes on devices up to iOS 5.1.1, particularly those with the A4 chipset. It includes instructions for booting a ramdisk and custom kernel, establishing a connection via SSH, and utilizing brute-force techniques to uncover passcodes. Utilizing various tools like Redsn0w and Python scripts, this method allows for the imaging and decryption of device data, as well as limited file recovery and analysis. Dive into iOS hacking with a structured approach.

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Subverting iOS Data Protection: A Step-by-Step Guide to Cracking Passcodes

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  1. Subverting iOS Data Protection Cracking the Passcode (PIN)

  2. Commands • Step 1: Boot ramdisk and custom kernel on device • ./redsn0w_mac_0.9.15b3/redsn0w.app/Contents/MacOS/redsn0w -i iPhone3,3_5.1.1_9B206_Restore.ipsw -r myramdisk_n90ap.dmg -k kernelcache.release.n90.patched • Step 2: Establish connection to phone (ssh over usb using ssl, aka usbmux, or USB Multiplexing) • python usbmuxd-python-client/tcprelay.py -t 22:2222 1999:1999 • Step 3: Bruteforce passcode • python python_scripts/demo_bruteforce.py • Step 4: Profit!

  3. Passcode Complexity Source: iOS Hacker’s Handbook

  4. Tools • FOSS • iPhone Data Protection Suite • Up to iOS 5.1.1 • A4 chipset (3GS, iPhone4, iPod Touch 2,3,4) • Crack passcode, image device, decrypt image, recover deleted files (limited), file analysis • https://code.google.com/p/iphone-dataprotection/wiki/README • Zdziarski’siOS forensic tools • Acquisition, PIN bypass, decryption, analysis • iOS 3.x / 4.x

  5. Tools • Commerical • ElcomsoftiOS Forensic Toolkit • iOS 3.x to 7.x • A4 chipset, A5 requires jailbroken device • Crack simple passcode, image device, decrypt image, recover deleted files, file analysis • http://www.elcomsoft.com/eift.html • Paraben, Cellebrite, Oxygen

  6. Moral of the Story? • 10,000 combinations of 4-digit PIN using 0-9 • Out of 3 million PINs analyzed, 27% are represented by the dataset to the left • DOH!

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