Tên: Improper Handling of Unicode Encoding

The product does not properly handle when an input contains Unicode encoding.

Thông tin chung

Các cách xuất hiện

Implementation

Nền tảng áp dụng

Ngôn ngữ

Lớp: Not Language-Specific (Undetermined)
Tên: Python (Undetermined)

Công nghệ

Lớp: Not Technology-Specific (Undetermined)

Hậu quả phổ biến

Phạm vi	Tác động	Khả năng xảy ra
Integrity	Unexpected State

Ví dụ đã quan sát

Tài liệu tham khảo	Mô tả
CVE-2000-0884	Server allows remote attackers to read documents outside of the web root, and possibly execute arbitrary commands, via malformed URLs that contain Unicode encoded characters.
CVE-2001-0709	Server allows a remote attacker to obtain source code of ASP files via a URL encoded with Unicode.
CVE-2001-0669	Overlaps interaction error.

Các biện pháp giảm thiểu tiềm năng

Phases : Architecture and Design
Avoid making decisions based on names of resources (e.g. files) if those resources can have alternate names.
Phases : Implementation
Phases : Implementation
Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.

Phương pháp phát hiện

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.)

Ghi chú ánh xạ lỗ hổng

Lý do : 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.
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.

Mẫu tấn công liên quan

ID CAPEC	Tên mẫu tấn công
CAPEC-71	Using Unicode Encoding to Bypass Validation Logic An attacker may provide a Unicode string to a system component that is not Unicode aware and use that to circumvent the filter or cause the classifying mechanism to fail to properly understanding the request. That may allow the attacker to slip malicious data past the content filter and/or possibly cause the application to route the request incorrectly.

Tài liệu tham khảo

REF-62

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

REF-1541

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

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 Potential_Mitigations, Time_of_Introduction
CWE Content Team	MITRE	2008-09-08 +00:00	updated Relationships, Taxonomy_Mappings
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	2009-05-27 +00:00	updated Demonstrative_Examples
CWE Content Team	MITRE	2009-07-27 +00:00	updated Potential_Mitigations
CWE Content Team	MITRE	2010-12-13 +00:00	updated Name
CWE Content Team	MITRE	2011-03-29 +00:00	updated Potential_Mitigations
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 Observed_Examples, References, Relationships
CWE Content Team	MITRE	2012-10-30 +00:00	updated Potential_Mitigations
CWE Content Team	MITRE	2014-07-30 +00:00	updated Relationships
CWE Content Team	MITRE	2017-11-08 +00:00	updated Applicable_Platforms, Taxonomy_Mappings
CWE Content Team	MITRE	2020-02-24 +00:00	updated Potential_Mitigations, Relationships
CWE Content Team	MITRE	2020-06-25 +00:00	updated Potential_Mitigations
CWE Content Team	MITRE	2023-01-31 +00:00	updated Description
CWE Content Team	MITRE	2023-04-27 +00:00	updated 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
CWE Content Team	MITRE	2025-12-11 +00:00	updated Applicable_Platforms, Weakness_Ordinalities
CWE Content Team	MITRE	2026-10-28 +00:00	updated Applicable_Platforms, Detection_Factors, References, Relationships, Taxonomy_Mappings

Chi tiết CWE-176

CWE-176