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Insufficient Filtering of File and Other Resource Names for Executable Content Status: Incomplete Weakness ID: 641 (Weakness Variant)Description Summary When an application does not restrict the valid names of resources (e.g. files) supplied by the user, various problems may arise down the line when these resources are used. For instance, if the names of these resources contain scripting characters, it is possible that a script may get executed in the client's browser if the application ever displays the name of the resource on a dynamically generated webpage. Or if the resources are consumed by some application parser, a specially crafted name can exploit some vulnerability internal to the parser, potentially resulting in execution of arbitrary code on the server machine. The problems will vary based on the context of usage of such malformed resource names and whether vulnerabilities are present in or assumptions are made by the targeted technology that would make code execution possible. Likelihood of Exploit Low Common Consequences Execution of arbitrary code in the context of usage of the resources with dangerous names Crash of the consumer code of these resources resulting in information leakage or denial of service Enabling Factors for Exploitation Resource names are controllable by the user. No sufficient validation of resource names at entry points or before consumption by other processes. Context where the resources are consumed makes execution of code possible based on the names of the supplied resources. Potential Mitigations Do not allow users to control names of resources used on the server side. Perform white list input validation at entry points and also before consuming the resources. Reject bad file names rather than trying to cleanse them. Make sure that technologies consuming the resources are not vulnerable (e.g. buffer overflow, format string, etc.) in a way that would allow code execution if the name of the resource is malformed. Observed Examples
Relationships
Applicable Platforms Languages All Time of Introduction  Architecture and Design ImplementationContent History Modifications CWE Content Team. MITRE. 2008-09-08. (Internal) updated Common_Consequences, Relationships |
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