CWE-479 詳細

The product defines a signal handler that calls a non-reentrant function.

背景の詳細

導入モード

Implementation

適用可能なプラットフォーム

言語

名前： C (Undetermined)
名前： C++ (Undetermined)

一般的な結果

観察された例

潜在的な緩和策

Phases : Requirements
Require languages or libraries that provide reentrant functionality, or otherwise make it easier to avoid this weakness.
Phases : Architecture and Design
Design signal handlers to only set flags rather than perform complex functionality.
Phases : Implementation
Ensure that non-reentrant functions are not found in signal handlers.
Phases : Implementation
Use sanity checks to reduce the timing window for exploitation of race conditions. This is only a partial solution, since many attacks might fail, but other attacks still might work within the narrower window, even accidentally.

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.

参考文献

REF-18

The CLASP Application Security Process
Secure Software, Inc..
https://cwe.mitre.org/documents/sources/TheCLASPApplicationSecurityProcess.pdf

REF-62

The Art of Software Security Assessment
Mark Dowd, John McDonald, Justin Schuh.

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