名前: Permissive Regular Expression

The product uses a regular expression that does not sufficiently restrict the set of allowed values.

一般情報

導入モード

Implementation : This problem is frequently found when the regular expression is used in input validation or security features such as authentication.

適用可能なプラットフォーム

言語

名前： Perl (Undetermined)
名前： PHP (Undetermined)
名前： Python (Undetermined)

一般的な結果

スコープ	影響	可能性
Access Control	Bypass Protection Mechanism 注記：The regexp could accept substrings that match the pattern, which produces a partial comparison to the target. In some cases, this can allow dangerous substrings to bypass the intended protection.

観察された例

参考文献	説明
CVE-2021-22204	Chain: regex in EXIF processor code does not correctly determine where a string ends (CWE-625), enabling eval injection (CWE-95), as exploited in the wild per CISA KEV.
CVE-2006-1895	".*" regexp leads to static code injection
CVE-2002-2175	insertion of username into regexp results in partial comparison, causing wrong database entry to be updated when one username is a substring of another.
CVE-2006-4527	regexp intended to verify that all characters are legal, only checks that at least one is legal, enabling file inclusion.
CVE-2005-1949	Regexp for IP address isn't anchored at the end, allowing appending of shell metacharacters.
CVE-2002-2109	Regexp isn't "anchored" to the beginning or end, which allows spoofed values that have trusted values as substrings.
CVE-2006-6511	regexp in .htaccess file allows access of files whose names contain certain substrings
CVE-2006-6629	allow load of macro files whose names contain certain substrings.

潜在的な緩和策

Phases : Implementation
When applicable, ensure that the regular expression marks beginning and ending string patterns, such as "/^string$/" for Perl.

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.

参考文献

REF-62

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

登録情報

名前	組織	日付	リリース日	Version
CWE Content Team	MITRE	2007-05-07 +00:00	2007-05-07 +00:00	Draft 6

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 Applicable_Platforms, Description, Relationships, Observed_Example, Other_Notes, Weakness_Ordinalities
CWE Content Team	MITRE	2009-03-10 +00:00	updated Description
CWE Content Team	MITRE	2009-05-27 +00:00	updated Demonstrative_Examples
CWE Content Team	MITRE	2009-07-27 +00:00	updated Relationships
CWE Content Team	MITRE	2011-06-01 +00:00	updated Common_Consequences, Relationships, Taxonomy_Mappings
CWE Content Team	MITRE	2012-05-11 +00:00	updated Demonstrative_Examples, References, Relationships, Taxonomy_Mappings
CWE Content Team	MITRE	2012-10-30 +00:00	updated Potential_Mitigations
CWE Content Team	MITRE	2014-06-23 +00:00	updated Modes_of_Introduction, Other_Notes
CWE Content Team	MITRE	2014-07-30 +00:00	updated Relationships
CWE Content Team	MITRE	2017-11-08 +00:00	updated Demonstrative_Examples, Observed_Examples
CWE Content Team	MITRE	2019-01-03 +00:00	updated Taxonomy_Mappings
CWE Content Team	MITRE	2020-02-24 +00:00	updated Relationships
CWE Content Team	MITRE	2021-03-15 +00:00	updated Demonstrative_Examples
CWE Content Team	MITRE	2022-06-28 +00:00	updated Observed_Examples
CWE Content Team	MITRE	2022-10-13 +00:00	updated Demonstrative_Examples
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	2026-10-28 +00:00	updated Applicable_Platforms, Common_Consequences, Description, Technical_Nuance

CWE-625 詳細

CWE-625