CWE-327 - Use of a Broken or Risky Cryptographic Algorithm
- Abstraction:Class
- Structure:Simple
- Status:Draft
- Release Date:2006-07-19
- Latest Modification Date:2023-06-29
Weakness Name
Use of a Broken or Risky Cryptographic Algorithm
Description
The product uses a broken or risky cryptographic algorithm or protocol.
Cryptographic algorithms are the methods by which data is scrambled to prevent observation or influence by unauthorized actors. Insecure cryptography can be exploited to expose sensitive information, modify data in unexpected ways, spoof identities of other users or devices, or other impacts. It is very difficult to produce a secure algorithm, and even high-profile algorithms by accomplished cryptographic experts have been broken. Well-known techniques exist to break or weaken various kinds of cryptography. Accordingly, there are a small number of well-understood and heavily studied algorithms that should be used by most products. Using a non-standard or known-insecure algorithm is dangerous because a determined adversary may be able to break the algorithm and compromise whatever data has been protected. Since the state of cryptography advances so rapidly, it is common for an algorithm to be considered "unsafe" even if it was once thought to be strong. This can happen when new attacks are discovered, or if computing power increases so much that the cryptographic algorithm no longer provides the amount of protection that was originally thought. For a number of reasons, this weakness is even more challenging to manage with hardware deployment of cryptographic algorithms as opposed to software implementation. First, if a flaw is discovered with hardware-implemented cryptography, the flaw cannot be fixed in most cases without a recall of the product, because hardware is not easily replaceable like software. Second, because the hardware product is expected to work for years, the adversary's computing power will only increase over time.
Common Consequences
Scope: Confidentiality
Impact: Read Application Data
Notes: The confidentiality of sensitive data may be compromised by the use of a broken or risky cryptographic algorithm.
Scope: Integrity
Impact: Modify Application Data
Notes: The integrity of sensitive data may be compromised by the use of a broken or risky cryptographic algorithm.
Scope: Accountability, Non-Repudiation
Impact: Hide Activities
Notes: If the cryptographic algorithm is used to ensure the identity of the source of the data (such as digital signatures), then a broken algorithm will compromise this scheme and the source of the data cannot be proven.