Name Embedding Script (XSS) in HTTP Headers
Summary An attack of this type exploits web applications that generate web content, such as links in a HTML page, based on unvalidated or improperly validated data submitted by other actors. XSS in HTTP Headers attacks target the HTTP headers which are hidden from most users and may not be validated by web applications.
Prerequisites Target software must be a client that allows scripting communication from remote hosts, and attacker must control a remote site of some sort to redirect client and data to.
Solutions Design: Use browser technologies that do not allow client side scripting. Design: Utilize strict type, character, and encoding enforcement Design: Server side developers should not proxy content via XHR or other means, if a http proxy for remote content is setup on the server side, the client's browser has no way of discerning where the data is originating from. Implementation: Ensure all content that is delivered to client is sanitized against an acceptable content specification. Implementation: Perform input validation for all remote content. Implementation: Perform output validation for all remote content. Implementation: Disable scripting languages such as JavaScript in browser Implementation: Session tokens for specific host Implementation: Patching software. There are many attack vectors for XSS on the client side and the server side. Many vulnerabilities are fixed in service packs for browser, web servers, and plug in technologies, staying current on patch release that deal with XSS countermeasures mitigates this.
Related Weaknesses
CWE ID Description
CWE-20 Improper Input Validation
CWE-71 Apple '.DS_Store'
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-86 Improper Neutralization of Invalid Characters in Identifiers in Web Pages
CWE-96 Improper Neutralization of Directives in Statically Saved Code ('Static Code Injection')
CWE-116 Improper Encoding or Escaping of Output
CWE-184 Incomplete Blacklist
CWE-348 Use of Less Trusted Source
CWE-692
CWE-697 Insufficient Comparison
CWE-713
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