이름: Permissive Cross-domain Security Policy with Untrusted Domains

The product uses a web-client protection mechanism such as a Content Security Policy (CSP) or cross-domain policy file, but the policy includes untrusted domains with which the web client is allowed to communicate.

일반 정보

배경 세부 정보

취약점 도입 방식

Implementation
Architecture and Design : COMMISSION: This weakness refers to an incorrect design related to an architectural security tactic.

적용 가능한 플랫폼

언어

클래스: Not Language-Specific (Undetermined)

기술

클래스: Web Based (Undetermined)
이름: Web Server (Undetermined)

일반적인 결과

범위	영향	가능성
Confidentiality Integrity Availability Access Control	Execute Unauthorized Code or Commands, Bypass Protection Mechanism, Read Application Data, Varies by Context 참고: If a cross-domain policy file includes domains that should not be trusted, such as when using wildcards under a high-level domain, then the application could be attacked by these untrusted domains. In many cases, the attack can be launched without the victim even being aware of it. With an overly permissive policy file, an attacker may be able to bypass the web browser's same-origin policy and conduct many of the same attacks seen in Cross-Site Scripting (CWE-79). An attacker can exploit the weakness to transfer private information from the victim's machine to the attacker, manipulate or steal cookies that may include session information, create malicious requests to a web site on behalf of the victim, or execute malicious code on the end user systems. Other damaging attacks include the disclosure of end user files, installation of Trojan horse programs, redirecting the user to some other page or site, running ActiveX controls (under Microsoft Internet Explorer) from sites that a user perceives as trustworthy, and modifying presentation of content.

관찰된 예시

참고 자료	설명
CVE-2012-2292	Product has a Silverlight cross-domain policy that does not restrict access to another application, which allows remote attackers to bypass the Same Origin Policy.
CVE-2014-2049	The default Flash Cross Domain policies in a product allow remote attackers to access user files.
CVE-2007-6243	Chain: Adobe Flash Player does not sufficiently restrict the interpretation and usage of cross-domain policy files, which makes it easier for remote attackers to conduct cross-domain and cross-site scripting (XSS) attacks.
CVE-2008-4822	Chain: Adobe Flash Player and earlier does not properly interpret policy files, which allows remote attackers to bypass a non-root domain policy.
CVE-2010-3636	Chain: Adobe Flash Player does not properly handle unspecified encodings during the parsing of a cross-domain policy file, which allows remote web servers to bypass intended access restrictions via unknown vectors.

잠재적 완화 방법

Phases : Architecture and Design // Operation
Define a restrictive Content Security Policy [REF-1486] or cross-domain policy file.
Phases : Architecture and Design // Operation
Avoid using wildcards in the CSP / cross-domain policy file. Any domain matching the wildcard expression will be implicitly trusted, and can perform two-way interaction with the target server.
Phases : Architecture and Design // Operation
For Flash, modify crossdomain.xml to use meta-policy options such as 'master-only' or 'none' to reduce the possibility of an attacker planting extraneous cross-domain policy files on a server.

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 Variant 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-1486

Content Security Policy Cheat Sheet
OWASP.
https://cheatsheetseries.owasp.org/cheatsheets/Content_Security_Policy_Cheat_Sheet.html

REF-943

Setting a crossdomain.xml file for HTTP streaming
Apurva Udaykumar.
https://web.archive.org/web/20121124184922/http://www.adobe.com/devnet/adobe-media-server/articles/cross-domain-xml-for-streaming.html

REF-944

Cross-domain policy for Flash movies
Adobe.
http://kb2.adobe.com/cps/142/tn_14213.html

REF-945

HTTP Communication and Security with Silverlight
Microsoft Corporation.
https://learn.microsoft.com/en-us/previous-versions/windows/silverlight/dotnet-windows-silverlight/cc838250(v=vs.95)?redirectedfrom=MSDN

REF-946

Network Security Access Restrictions in Silverlight
Microsoft Corporation.
https://learn.microsoft.com/en-us/previous-versions/windows/silverlight/dotnet-windows-silverlight/cc645032(v=vs.95)

REF-947

Analyzing the Crossdomain Policies of Flash Applications
Dongseok Jang, Aishwarya Venkataraman, G. Michael Sawka, Hovav Shacham.
http://cseweb.ucsd.edu/~hovav/dist/crossdomain.pdf

제출

이름	조직	날짜	출시일	Version
CWE Content Team	MITRE	2014-06-05 +00:00	2014-06-23 +00:00	2.7

수정 사항

이름	조직	날짜	댓글
CWE Content Team	MITRE	2017-11-08 +00:00	updated Modes_of_Introduction, References, Relationships
CWE Content Team	MITRE	2019-06-20 +00:00	updated Relationships
CWE Content Team	MITRE	2020-02-24 +00:00	updated Applicable_Platforms, Relationships
CWE Content Team	MITRE	2020-06-25 +00:00	updated Description, Name
CWE Content Team	MITRE	2021-10-28 +00:00	updated Relationships
CWE Content Team	MITRE	2023-01-31 +00:00	updated Description, Relationships
CWE Content Team	MITRE	2023-04-27 +00:00	updated Detection_Factors, References, Relationships
CWE Content Team	MITRE	2023-06-29 +00:00	updated Mapping_Notes, Relationships
CWE Content Team	MITRE	2024-02-29 +00:00	updated Demonstrative_Examples
CWE Content Team	MITRE	2025-09-09 +00:00	updated Background_Details, Common_Consequences, Description, Name, Potential_Mitigations, 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 Common_Consequences, Description, Observed_Examples

CWE-942 상세 정보

CWE-942