名前: Compiler Removal of Code to Clear Buffers

Sensitive memory is cleared according to the source code, but compiler optimizations leave the memory untouched when it is not read from again, aka "dead store removal."

一般情報

導入モード

Array
Build and Compilation

適用可能なプラットフォーム

言語

名前： C (Undetermined)
名前： C++ (Undetermined)
クラス： Compiled (Undetermined)

アーキテクチャ

クラス： Not Architecture-Specific (Undetermined)

一般的な結果

スコープ	影響	可能性
Confidentiality Access Control	Read Memory, Bypass Protection Mechanism 注記：This weakness will allow data that has not been cleared from memory to be read. If this data contains sensitive password information, then an attacker can read the password and use the information to bypass protection mechanisms.

潜在的な緩和策

Phases : Implementation
Store the sensitive data in a "volatile" memory location if available.
Phases : Build and Compilation
If possible, configure the compiler so that it does not remove dead stores.
Phases : Architecture and Design
Where possible, encrypt sensitive data that are used by a software system.

検出方法

Black Box

This specific weakness is impossible to detect using black box methods. While an analyst could examine memory to see that it has not been scrubbed, an analysis of the executable would not be successful. This is because the compiler has already removed the relevant code. Only the source code shows whether the programmer intended to clear the memory or not, so this weakness is indistinguishable from others.
有効性 : Limited

White Box

This weakness is only detectable using white box methods (see black box detection factor). Careful analysis is required to determine if the code is likely to be removed by the compiler.

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-6

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

REF-7

Writing Secure Code
Michael Howard, David LeBlanc.
https://www.microsoftpressstore.com/store/writing-secure-code-9780735617223

REF-124

When scrubbing secrets in memory doesn't work
Michael Howard.
https://seclists.org/bugtraq/2002/Nov/48

REF-125

Some Bad News and Some Good News
Michael Howard.
https://learn.microsoft.com/en-us/previous-versions/ms972826(v=msdn.10)

REF-126

GNU GCC: Optimizer Removes Code Necessary for Security
Joseph Wagner.
https://seclists.org/bugtraq/2002/Nov/266

登録情報

名前	組織	日付	リリース日	Version
7 Pernicious Kingdoms		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
CWE Content Team	MITRE	2008-09-08 +00:00	updated Relationships, Other_Notes, Taxonomy_Mappings
CWE Content Team	MITRE	2008-10-14 +00:00	updated Relationships
CWE Content Team	MITRE	2008-11-24 +00:00	updated Applicable_Platforms, Description, Detection_Factors, Other_Notes, Potential_Mitigations, Relationships, Taxonomy_Mappings, Time_of_Introduction
CWE Content Team	MITRE	2009-05-27 +00:00	updated Demonstrative_Examples
CWE Content Team	MITRE	2010-02-16 +00:00	updated References
CWE Content Team	MITRE	2011-06-01 +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 Common_Consequences, References, Relationships
CWE Content Team	MITRE	2014-07-30 +00:00	updated Relationships, Taxonomy_Mappings
CWE Content Team	MITRE	2017-01-19 +00:00	updated Relationships
CWE Content Team	MITRE	2017-11-08 +00:00	updated References, Relationships, Taxonomy_Mappings
CWE Content Team	MITRE	2018-03-27 +00:00	updated References, Type
CWE Content Team	MITRE	2020-02-24 +00:00	updated References, Relationships
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	2024-02-29 +00:00	updated Demonstrative_Examples, Description
CWE Content Team	MITRE	2025-09-09 +00:00	updated References
CWE Content Team	MITRE	2025-12-11 +00:00	updated Applicable_Platforms, Demonstrative_Examples, Detection_Factors, Weakness_Ordinalities
CWE Content Team	MITRE	2026-10-28 +00:00	updated Description, Modes_of_Introduction, Potential_Mitigations, References

CWE-14 詳細

CWE-14