Email Header Injection Security Testing FAQs

Question 1

What is email header injection?

Accepted Answer

Email header injection is a vulnerability where an attacker injects additional SMTP headers into an email sent by a web application, allowing them to modify recipients, spoof the sender, or use the server as a spam relay.

Question 2

What is the best way to prevent email header injection?

Accepted Answer

Prevention requires strict input validation to reject newline characters in header-related inputs, using parameterized email APIs that separate headers from content, and implementing rate limiting.

Question 3

What are the common impacts of this vulnerability?

Accepted Answer

The primary impacts include the application being used as a mass-spam relay, phishing attacks where the sender address is spoofed, and potential theft of sensitive data like password reset tokens.

Question 4

Can this skill test modern JSON-based APIs?

Accepted Answer

Yes, it includes specialized workflows for testing JSON payloads, checking for newline character handling within string values and array-based recipient injection.

Question 5

How do I test for CRLF injection in emails?

Accepted Answer

Testing involves injecting URL-encoded carriage return (%0D) and line feed (%0A) characters into form fields like 'email' or 'subject' followed by a new header such as 'Bcc: attacker@evil.com'.

Email Header Injection Security Testing

Características Principales

Casos de Uso

Email Header Injection Security Testing

Características Principales

Casos de Uso