• Platform: Android
• Weakness: MASWE-0007, MASWE-0009, MASWE-0010
• Weakness in the numbering of the MASWE beta: MASWE-0012
• Profiles: L2 (advanced security)
• Type: dynamic, hooks
• Knowledge: MASTG-KNOW-0012

Overview

This test is the dynamic counterpart to MASTG-TEST-0307, but it focuses on intercepting cryptographic operations rather than generating keys with multiple purposes.

Some of the relevant functions to intercept are:

• Cipher.init(int opmode, Key key, AlgorithmParameters params)) where opmode is one of:
• Cipher.ENCRYPT_MODE
• Cipher.DECRYPT_MODE
• Cipher.WRAP_MODE
• Cipher.UNWRAP_MODE
• Signature.initSign(PrivateKey privateKey))
• Signature.initVerify(PublicKey publicKey))

Steps

1. Use MASTG-TECH-0005 to install the app.
2. Use MASTG-TECH-0043 to hook the relevant API calls.
3. Exercise the app extensively to trigger as many flows as possible and enter sensitive data wherever you can.

Observation

The output should contain a list of all cryptographic operations together with their corresponding keys.

Evaluation

The test case fails if you find any keys used for multiple roles.

Using the output, ensure that each key (or key pair) is restricted to exactly one of the following groups of operations:

• Encryption/Decryption (used in Cipher operations with ENCRYPT_MODE or DECRYPT_MODE)
• Signing/Verification (used in Signature operations)
• Key Wrapping (used in Cipher operations with WRAP_MODE or UNWRAP_MODE)

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