CWE-241 非预期数据类型处理不恰当

Improper Handling of Unexpected Data Type

结构: Simple

Abstraction: Base

状态: Draft

被利用可能性: unkown

基本描述

The software does not handle or incorrectly handles when a particular element is not the expected type, e.g. it expects a digit (0-9) but is provided with a letter (A-Z).

适用平台

Language: {'cwe_Class': 'Language-Independent', 'cwe_Prevalence': 'Undetermined'}

常见的影响

范围	影响	注释
['Integrity', 'Other']	['Varies by Context', 'Unexpected State']

可能的缓解方案

MIT-5 Implementation

策略: Input Validation

Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a whitelist of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does. When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue." Do not rely exclusively on looking for malicious or malformed inputs (i.e., do not rely on a blacklist). A blacklist is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, blacklists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.

MIT-20 Implementation

策略: Input Validation

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 whitelist validation schemes by introducing dangerous inputs after they have been checked.

分析过的案例

标识	说明	链接
CVE-1999-1156	FTP server crash via PORT command with non-numeric character.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-1156
CVE-2004-0270	Anti-virus product has assert error when line length is non-numeric.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0270

Notes

分类映射

映射的分类名	ImNode ID	Fit	Mapped Node Name
PLOVER			Wrong Data Type
CERT C Secure Coding	FIO37-C	CWE More Abstract	Do not assume that fgets() or fgetws() returns a nonempty string when successful

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