이름: Integer Underflow (Wrap or Wraparound)

The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

CWE 설명

This can happen in signed and unsigned cases.

일반 정보

취약점 도입 방식

Implementation

적용 가능한 플랫폼

언어

이름: C (Undetermined)
이름: C++ (Undetermined)
이름: Java (Undetermined)
이름: C# (Undetermined)
이름: Python (Undetermined)

일반적인 결과

범위	영향	가능성
Availability	DoS: Crash, Exit, or Restart, DoS: Resource Consumption (CPU), DoS: Resource Consumption (Memory), DoS: Instability 참고: This weakness will generally lead to undefined behavior and therefore crashes. In the case of overflows involving loop index variables, the likelihood of infinite loops is also high.
Integrity	Modify Memory 참고: If the value in question is important to data (as opposed to flow), simple data corruption has occurred. Also, if the wrap around results in other conditions such as buffer overflows, further memory corruption may occur.
Confidentiality Availability Access Control	Execute Unauthorized Code or Commands, Bypass Protection Mechanism 참고: This weakness can sometimes trigger buffer overflows which can be used to execute arbitrary code. This is usually outside the scope of a program's implicit security policy.

관찰된 예시

참고 자료	설명
CVE-2004-0816	Integer underflow in firewall via malformed packet.
CVE-2004-1002	Integer underflow by packet with invalid length.
CVE-2005-0199	Long input causes incorrect length calculation.
CVE-2005-1891	Malformed icon causes integer underflow in loop counter variable.

탐지 방법

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.)
효과성 : High

취약점 매핑 메모

근거 : 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.
댓글 : 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.

참고 자료

REF-44

24 Deadly Sins of Software Security
Michael Howard, David LeBlanc, John Viega.

REF-1541

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

제출

이름	조직	날짜	출시일	Version
PLOVER		2006-07-19 +00:00	2006-07-19 +00:00	Draft 3

수정 사항

이름	조직	날짜	댓글
Eric Dalci	Cigital	2008-07-01 +00:00	updated Demonstrative_Example
CWE Content Team	MITRE	2008-09-08 +00:00	updated Alternate_Terms, Applicable_Platforms, Relationships, Taxonomy_Mappings
CWE Content Team	MITRE	2008-10-14 +00:00	updated Description
CWE Content Team	MITRE	2009-05-27 +00:00	updated Demonstrative_Examples
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	2012-05-11 +00:00	updated Common_Consequences, References, Relationships
CWE Content Team	MITRE	2014-07-30 +00:00	updated Demonstrative_Examples, Relationships, Taxonomy_Mappings
CWE Content Team	MITRE	2015-12-07 +00:00	updated Relationships
CWE Content Team	MITRE	2017-11-08 +00:00	updated Taxonomy_Mappings
CWE Content Team	MITRE	2019-01-03 +00:00	updated Relationships
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	2022-04-28 +00:00	updated Research_Gaps
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	2025-12-11 +00:00	updated Weakness_Ordinalities
CWE Content Team	MITRE	2026-10-28 +00:00	updated Applicable_Platforms, References, Relationships, Taxonomy_Mappings

CWE-191 상세 정보

CWE-191