CWE-109 詳細

Automatic filtering via a Struts bean has been turned off, which disables the Struts Validator and custom validation logic. This exposes the application to other weaknesses related to insufficient input validation.

導入モード

Implementation

適用可能なプラットフォーム

言語

名前： Java (Undetermined)

一般的な結果

潜在的な緩和策

Phases : Implementation
Ensure that an action form mapping enables validation. Set the validate field to true.

検出方法

Automated Static Analysis

Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)
有効性 : High

脆弱性マッピングノート

理由 : This CWE entry is at the Variant level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.
コメント : Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.

ノート

The Action Form mapping in the demonstrative example disables the form's validate() method. The Struts bean: write tag automatically encodes special HTML characters, replacing a < with "<" and a > with ">". This action can be disabled by specifying filter="false" as an attribute of the tag to disable specified JSP pages. However, being disabled makes these pages susceptible to cross-site scripting attacks. An attacker may be able to insert malicious scripts as user input to write to these JSP pages.

参考文献

REF-6

Seven Pernicious Kingdoms: A Taxonomy of Software Security Errors
Katrina Tsipenyuk, Brian Chess, Gary McGraw.
https://cwe.mitre.org/documents/sources/SevenPerniciousKingdoms.pdf

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