mobsf.mobsfscan.aes_ecb.aes_ecb_mode_default

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Calling Cipher.getInstance("AES") will return AES ECB mode by default. ECB mode is known to be weak as it results in the same ciphertext for identical blocks of plaintext.

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rules:
  - id: aes_ecb_mode_default
    patterns:
      - pattern-either:
          - pattern: |
              Cipher.getInstance("AES")
    message: Calling Cipher.getInstance("AES") will return AES ECB mode by default.
      ECB mode is known to be weak as it results in the same ciphertext for
      identical blocks of plaintext.
    severity: ERROR
    languages:
      - java
    metadata:
      cwe: cwe-327
      owasp-mobile: m5
      masvs: crypto-2
      reference: https://github.com/MobSF/owasp-mstg/blob/master/Document/0x04g-Testing-Cryptography.md#weak-block-cipher-mode
      license: LGPL-3.0-or-later