名前: Use of sizeof() on a Pointer Type

The code calls sizeof() on a pointer type, when the programmer intended to determine the size of the data that is being pointed to.

一般情報

導入モード

Implementation : The use of sizeof() on a pointer can sometimes generate useful information. An obvious case is to find out the wordsize on a platform. More often than not, the appearance of sizeof(pointer) indicates an incorrect calculation - i.e., a bug.

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

スコープ	影響	可能性
Integrity Confidentiality	Modify Memory, Read Memory 注記：This error can often cause one to allocate a buffer that is much smaller than what is needed, leading to resultant weaknesses such as buffer overflows.

観察された例

参考文献	説明
CVE-2025-33132	Database utility uses sizeof() on a pointer type, leading to incorrect size calculation and a crash.

潜在的な緩和策

Phases : Implementation
Use expressions such as "sizeof(*pointer)" instead of "sizeof(pointer)", unless you intend to run sizeof() on a pointer type to gain some platform independence or if you are allocating a variable on the stack.

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-442

EXP01-A. Do not take the sizeof a pointer to determine the size of a type
Robert Seacord.
https://www.securecoding.cert.org/confluence/display/seccode/EXP01-A.+Do+not+take+the+sizeof+a+pointer+to+determine+the+size+of+a+type

登録情報

名前	組織	日付	リリース日	Version
CLASP		2006-07-19 +00:00	2006-07-19 +00:00	Draft 3

変更履歴

名前	組織	日付	コメント
Eric Dalci	Cigital	2008-07-01 +00:00	updated Time_of_Introduction
	KDM Analytics	2008-08-01 +00:00	added/updated white box definitions
CWE Content Team	MITRE	2008-09-08 +00:00	updated Applicable_Platforms, Common_Consequences, Relationships, Other_Notes, Taxonomy_Mappings, Weakness_Ordinalities
CWE Content Team	MITRE	2008-11-24 +00:00	updated Relationships, Taxonomy_Mappings
CWE Content Team	MITRE	2009-03-10 +00:00	updated Demonstrative_Examples
CWE Content Team	MITRE	2009-12-28 +00:00	updated Demonstrative_Examples
CWE Content Team	MITRE	2010-02-16 +00:00	updated Relationships
CWE Content Team	MITRE	2011-06-01 +00:00	updated Common_Consequences
CWE Content Team	MITRE	2011-06-27 +00:00	updated Common_Consequences
CWE Content Team	MITRE	2011-09-13 +00:00	updated Relationships, Taxonomy_Mappings
CWE Content Team	MITRE	2012-05-11 +00:00	updated Relationships
CWE Content Team	MITRE	2014-06-23 +00:00	updated Description, Other_Notes
CWE Content Team	MITRE	2014-07-30 +00:00	updated Relationships, Taxonomy_Mappings
CWE Content Team	MITRE	2017-11-08 +00:00	updated Demonstrative_Examples, Taxonomy_Mappings, White_Box_Definitions
CWE Content Team	MITRE	2019-01-03 +00:00	updated Relationships
CWE Content Team	MITRE	2020-02-24 +00:00	updated References
CWE Content Team	MITRE	2023-04-27 +00:00	updated Detection_Factors, Relationships
CWE Content Team	MITRE	2023-06-29 +00:00	updated Mapping_Notes
CWE Content Team	MITRE	2024-11-19 +00:00	updated Description
CWE Content Team	MITRE	2025-04-03 +00:00	updated Demonstrative_Examples
CWE Content Team	MITRE	2026-10-28 +00:00	updated Description, Modes_of_Introduction, Observed_Examples

CWE-467 詳細

CWE-467