Tên: Small Space of Random Values

The number of possible random values is smaller than needed by the product, making it more susceptible to brute force attacks.

Thông tin chung

Các cách xuất hiện

Architecture and Design
Implementation : REALIZATION: This weakness is caused during implementation of an architectural security tactic.

Nền tảng áp dụng

Ngôn ngữ

Lớp: Not Language-Specific (Undetermined)

Công nghệ

Lớp: Not Technology-Specific (Undetermined)

Hậu quả phổ biến

Phạm vi	Tác động	Khả năng xảy ra
Access Control Other	Bypass Protection Mechanism, Other Ghi chú: An attacker could easily guess the values used. This could lead to unauthorized access to a system if the seed is used for authentication and authorization.

Ví dụ đã quan sát

Tài liệu tham khảo	Mô tả
CVE-2002-0583	Product uses 5 alphanumeric characters for filenames of expense claim reports, stored under web root.
CVE-2002-0903	Product uses a small number of random numbers for a code to approve an action, and also uses predictable new user IDs, allowing attackers to hijack new accounts.
CVE-2003-1230	SYN cookies implementation only uses 32-bit keys, making it easier to brute force ISN.
CVE-2004-0230	Complex predictability / randomness (reduced space).

Các biện pháp giảm thiểu tiềm năng

Phases : Architecture and Design // Requirements
Use products or modules that conform to FIPS 140-2 [REF-267] to avoid obvious entropy problems. Consult FIPS 140-2 Annex C ("Approved Random Number Generators").

Ghi chú ánh xạ lỗ hổng

Lý do : 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.
Bình luận : 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.

Ghi chú

As of CWE 4.5, terminology related to randomness, entropy, and predictability can vary widely. Within the developer and other communities, "randomness" is used heavily. However, within cryptography, "entropy" is distinct, typically implied as a measurement. There are no commonly-used definitions, even within standards documents and cryptography papers. Future versions of CWE will attempt to define these terms and, if necessary, distinguish between them in ways that are appropriate for different communities but do not reduce the usability of CWE for mapping, understanding, or other scenarios.

Tài liệu tham khảo

REF-267

FIPS PUB 140-2: SECURITY REQUIREMENTS FOR CRYPTOGRAPHIC MODULES
Information Technology Laboratory, National Institute of Standards and Technology.
https://csrc.nist.gov/files/pubs/fips/140-2/upd2/final/docs/fips1402.pdf

REF-44

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

Gửi

Tên	Tổ chức	Ngày	Ngày phát hành	Version
PLOVER		2006-07-19 +00:00	2006-07-19 +00:00	Draft 3

Sửa đổi

Tên	Tổ chức	Ngày	Bình luận
Eric Dalci	Cigital	2008-07-01 +00:00	updated Time_of_Introduction
CWE Content Team	MITRE	2008-09-08 +00:00	updated Relationships, Taxonomy_Mappings
CWE Content Team	MITRE	2009-03-10 +00:00	updated Potential_Mitigations
CWE Content Team	MITRE	2009-12-28 +00:00	updated Potential_Mitigations
CWE Content Team	MITRE	2010-06-21 +00:00	updated Potential_Mitigations
CWE Content Team	MITRE	2011-06-01 +00:00	updated Common_Consequences
CWE Content Team	MITRE	2011-09-13 +00:00	updated Potential_Mitigations, References
CWE Content Team	MITRE	2012-05-11 +00:00	updated Common_Consequences, Demonstrative_Examples, References, Relationships
CWE Content Team	MITRE	2012-10-30 +00:00	updated Potential_Mitigations
CWE Content Team	MITRE	2017-11-08 +00:00	updated Applicable_Platforms, Modes_of_Introduction, References, Relationships
CWE Content Team	MITRE	2020-02-24 +00:00	updated Relationships
CWE Content Team	MITRE	2021-07-20 +00:00	updated Maintenance_Notes
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	2025-09-09 +00:00	updated References
CWE Content Team	MITRE	2025-12-11 +00:00	updated Applicable_Platforms, Relationships, Weakness_Ordinalities
CWE Content Team	MITRE	2026-10-28 +00:00	updated Observed_Examples

Chi tiết CWE-334

CWE-334