Description

The application does not neutralize or incorrectly neutralizes web scripting syntax in HTTP headers that can be used by web browser components that can process raw headers, such as Flash.

Modes of Introduction:

– Architecture and Design

Likelihood of Exploit: High

Related Weaknesses

CWE-116

Consequences

Integrity, Confidentiality, Availability: Execute Unauthorized Code or Commands

Run arbitrary code.

Confidentiality: Read Application Data

Attackers may be able to obtain sensitive information.

Potential Mitigations

Phase: Architecture and Design

Description: 

Perform output validation in order to filter/escape/encode unsafe data that is being passed from the server in an HTTP response header.

Phase: Architecture and Design

Description: 

Disable script execution functionality in the clients’ browser.

CVE References

• CVE-2006-3918
  • Web server does not remove the Expect header from an HTTP request when it is reflected back in an error message, allowing a Flash SWF file to perform XSS attacks.