CWE-184
Incomplete List of Disallowed Inputs
Draft
2006-07-19 00:00 +00:00
2023-06-29 00:00 +00:00
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Incomplete List of Disallowed Inputs
The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete, leading to resultant weaknesses.
Extended Description
Developers often try to protect their products against malicious input by performing tests against inputs that are known to be bad, such as special characters that can invoke new commands. However, such lists often only account for the most well-known bad inputs. Attackers may be able to find other malicious inputs that were not expected by the developer, allowing them to bypass the intended protection mechanism.
Informations
Modes Of Introduction
Implementation : Developers might begin to develop a list of bad inputs as a fast way to fix a particular weakness, instead of fixing the root cause. See [REF-141].Architecture and Design : The design might rely solely on detection of malicious inputs as a protection mechanism.
Applicable Platforms
Language
Class: Not Language-Specific (Undetermined)Common Consequences
| Scope | Impact | Likelihood |
|---|---|---|
| Access Control | Bypass Protection Mechanism |
Observed Examples
| Reference | Description |
|---|---|
| product uses a denylist to identify potentially dangerous content, allowing attacker to bypass a warning | |
| PHP remote file inclusion in web application that filters "http" and "https" URLs, but not "ftp". | |
| Programming language does not filter certain shell metacharacters in Windows environment. | |
| XSS filter doesn't filter null characters before looking for dangerous tags, which are ignored by web browsers. MIE and validate-before-cleanse. | |
| Web-based mail product doesn't restrict dangerous extensions such as ASPX on a web server, even though others are prohibited. | |
| Resultant XSS when only |