CWE-329Generation of Predictable IV with CBC Mode

Description

The product generates and uses a predictable initialization Vector (IV) with Cipher Block Chaining (CBC) Mode, which causes algorithms to be susceptible to dictionary attacks when they are encrypted under the same key.

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Common consequences

• Confidentiality→Read Application Data
  If the IV is not properly initialized, data that is encrypted can be compromised and leak information.

Potential mitigations

• Implementation
  NIST recommends two methods of generating unpredictable IVs for CBC mode [REF-1172]. The first is to generate the IV randomly. The second method is to encrypt a nonce with the same key and cipher to be used to encrypt the plaintext. In this case the nonce must be unique but can be predictable, since the block cipher will act as a pseudo random permutation.

Related CWEs

Recent CVEs classified under this CWE