CWE

Inclusion of Web Functionality from an Untrusted Source

ID: 830		Date: (C)2012-05-14   (M)2022-10-10
Type: weakness		Status: INCOMPLETE
Abstraction Type: Base

Description

The software includes web functionality (such as a web widget) from another domain, which causes it to operate within the domain of the software, potentially granting total access and control of the software to the untrusted source.

Extended Description

Including third party functionality in a web-based environment is risky, especially if the source of the functionality is untrusted.

Even if the third party is a trusted source, the software may still be exposed to attacks and malicious behavior if that trusted source is compromised, or if the code is modified in transmission from the third party to the software.

This weakness is common in "mashup" development on the web, which may include source functionality from other domains. For example, Javascript-based web widgets may be inserted by using '<SCRIPT SRC="http://other.domain.here">' tags, which causes the code to run in the domain of the software, not the remote site from which the widget was loaded. As a result, the included code has access to the local DOM, including cookies and other data that the developer might not want the remote site to be able to access.

Such dependencies may be desirable, or even required, but sometimes programmers are not aware that a dependency exists.

Applicable Platforms
None

Common Consequences

Scope	Technical Impact	Notes
Confidentiality Integrity Availability	Execute unauthorized code or commands

Detection Methods
None

Potential Mitigations
None

Relationships

Related CWE	Type	View	Chain
CWE-830 ChildOf CWE-829	Weakness	CWE-1000 CWE-699

Demonstrative Examples   (Details)

1. This login webpage includes a weather widget from an external website: (Demonstrative Example Id DX-94)

White Box Definitions
None

Black Box Definitions
None

Taxynomy Mappings
None

References:

1. Jeremiah Grossman .Third-Party Web Widget Security FAQ.