名前: Access of Resource Using Incompatible Type

The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.

一般情報

導入モード

Implementation : This weakness is not unique to C and C++. While it is frequently associated with unions when parsing data with many different embedded object types in C, it can be present in any application that can interpret the same variable or memory location in multiple ways. For example, errors in PHP applications can be triggered by providing array parameters when scalars are expected, or vice versa. Languages such as Perl, which perform automatic conversion of a variable of one type when it is accessed as if it were another type, can also contain these issues.

適用可能なプラットフォーム

言語

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

一般的な結果

スコープ	影響	可能性
Other	Varies by Context 注記：When the product accesses the resource using an incompatible type, this could trigger logical errors because the resource does not have expected properties.
Availability Integrity Confidentiality	Read Memory, Modify Memory, Execute Unauthorized Code or Commands, DoS: Crash, Exit, or Restart 注記：If a memory buffer is accessed using an incompatible type, and the allocated buffer is smaller than the type that the code is attempting to access, then an attacker could read or write memory outside the bounds of the buffer, leading to a crash or possibly code execution.

観察された例

参考文献	説明
CVE-2025-32352	Type confusion in PHP app allows authentication bypass when users have passwords whose MD5 hashes can be interpreted as numbers
CVE-2010-4577	Type confusion in CSS sequence leads to out-of-bounds read.
CVE-2011-0611	Size inconsistency allows code execution, first discovered when it was actively exploited in-the-wild.
CVE-2010-0258	Improperly-parsed file containing records of different types leads to code execution when a memory location is interpreted as a different object than intended.

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 Base 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

参考文献

REF-811

Attacking Interoperability
Mark Dowd, Ryan Smith, David Dewey.
http://hustlelabs.com/stuff/bh2009_dowd_smith_dewey.pdf

REF-62

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

REF-1541

Secure Coding Guide for Python
OpenSSF.
https://best.openssf.org/Secure-Coding-Guide-for-Python/

登録情報

名前	組織	日付	リリース日	Version
CWE Content Team	MITRE	2011-05-15 +00:00	2011-06-01 +00:00	1.13

変更履歴

名前	組織	日付	コメント
CWE Content Team	MITRE	2012-05-11 +00:00	updated References
CWE Content Team	MITRE	2017-11-08 +00:00	updated Applicable_Platforms, Taxonomy_Mappings
CWE Content Team	MITRE	2019-01-03 +00:00	updated Relationships
CWE Content Team	MITRE	2019-06-20 +00:00	updated Relationships
CWE Content Team	MITRE	2020-02-24 +00:00	updated Relationships
CWE Content Team	MITRE	2020-06-25 +00:00	updated Common_Consequences, Relationships
CWE Content Team	MITRE	2022-04-28 +00:00	updated Research_Gaps
CWE Content Team	MITRE	2023-01-31 +00:00	updated Description
CWE Content Team	MITRE	2023-04-27 +00:00	updated References, Relationships
CWE Content Team	MITRE	2023-06-29 +00:00	updated Mapping_Notes
CWE Content Team	MITRE	2023-10-26 +00:00	updated Demonstrative_Examples
CWE Content Team	MITRE	2025-12-11 +00:00	updated Detection_Factors, Observed_Examples, Weakness_Ordinalities
CWE Content Team	MITRE	2026-10-28 +00:00	updated Alternate_Terms, Applicable_Platforms, Common_Consequences, Demonstrative_Examples, Description, Modes_of_Introduction, Name, References, Relationships, Taxonomy_Mappings

CWE-843 詳細

CWE-843