CWE-105

Variant Abstraction Level
Pillar — Highest-level weakness category
Class — Abstract, language-independent
Base — Specific enough to detect
Variant — Tied to specific technology
Compound — Requires multiple weaknesses Draft MITRE CWE Status
Stable — Fully reviewed and complete
Draft — Under development, may change
Incomplete — Partially defined by MITRE
Deprecated — No longer recommended
Obsolete — Replaced by another CWE
Struts: Form Field Without Validator

Description

The product has a form field that is not validated by a corresponding validation form, which can introduce other weaknesses related to insufficient input validation.

Omitting validation for even a single input field may give attackers the leeway they need to compromise the product. Although J2EE applications are not generally susceptible to memory corruption attacks, if a J2EE application interfaces with native code that does not perform array bounds checking, an attacker may be able to use an input validation mistake in the J2EE application to launch a buffer overflow attack.

Consequences

Integrity — Unexpected State
Integrity — Bypass Protection Mechanism

If unused fields are not validated, shared business logic in an action may allow attackers to bypass the validation checks that are performed for other uses of the form.

Mitigations

Phase: Implementation

Validate all form fields. If a field is unused, it is still important to constrain it so that it is empty or undefined.