CWE-179
Incorrect Behavior Order: Early Validation
AI Translation Available
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.
Status
incomplete
Abstraction
base
Affected Platforms
Extended Description
AI Translation
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.
Technical Details
AI Translation
Common Consequences
access control
integrity
Impacts
bypass protection mechanism
execute unauthorized code or commands
Potential Mitigations
Phases:
implementation
Descriptions:
•
Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.