CWE-646 依赖于外部提供文件的文件名或扩展名

Reliance on File Name or Extension of Externally-Supplied File

结构: Simple

Abstraction: Variant

状态: Incomplete

被利用可能性: High

基本描述

The software allows a file to be uploaded, but it relies on the file name or extension of the file to determine the appropriate behaviors. This could be used by attackers to cause the file to be misclassified and processed in a dangerous fashion.

扩展描述

An application might use the file name or extension of of a user-supplied file to determine the proper course of action, such as selecting the correct process to which control should be passed, deciding what data should be made available, or what resources should be allocated. If the attacker can cause the code to misclassify the supplied file, then the wrong action could occur. For example, an attacker could supply a file that ends in a ".php.gif" extension that appears to be a GIF image, but would be processed as PHP code. In extreme cases, code execution is possible, but the attacker could also cause exhaustion of resources, denial of service, exposure of debug or system data (including application source code), or being bound to a particular server side process. This weakness may be due to a vulnerability in any of the technologies used by the web and application servers, due to misconfiguration, or resultant from another flaw in the application itself.

适用平台

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

常见的影响

范围	影响	注释
Confidentiality	Read Application Data	An attacker may be able to read sensitive data.
Availability	DoS: Crash, Exit, or Restart	An attacker may be able to cause a denial of service.
Access Control	Gain Privileges or Assume Identity	An attacker may be able to gain privileges.

可能的缓解方案

Architecture and Design

策略:

Make decisions on the server side based on file content and not on file name or extension.

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