CWE-179—Incorrect Behavior Order: Early Validation

Weakness Name

Incorrect Behavior Order: Early Validation

Description

The product validates input before applying protection mechanisms that modify the input, which could allow an attacker to bypass the validation via dangerous inputs that only arise after the modification.

Product needs to validate data at the proper time, after data has been canonicalized and cleansed. Early validation is susceptible to various manipulations that result in dangerous inputs that are produced by canonicalization and cleansing.

Common Consequences

Scope:

Access Control, Integrity

Impact:

Bypass Protection Mechanism, Execute Unauthorized Code or Commands

Notes:

An attacker could include dangerous input that bypasses validation protection mechanisms which can be used to launch various attacks including injection attacks, execute arbitrary code or cause other unintended behavior.

Related Weaknesses

• CWE-20Improper Input ValidationHigh
• CWE-696Incorrect Behavior Order