HTTP Response splitting using CRLF

HTTP header injection allows attackers to add headers or inject content, leading to XSS attack

CRLF Injection

Impact of the vulnerability

The impact of CRLF injections varies depending on the attack context, but will typically cover all the consequences of cross-site scripting and information disclosure that the injection allowed. The technique can also be used to deactivate certain security restrictions like XSS filters and same-origin policy in the victim’s browser, paving the way for other malicious attacks.

How this template works

APIs Selection

The template uses a query parameter filter to extract the key and value from the request query parameters. It uses a regular expression to match any key and extracts it as "query_key". It also extracts the value as "query_value".

Execute request

The template modifies the query parameter by appending "%0d%0aContent-Length:%200%0d%0a%0d%0aHTTP/1.1%20200%20OK%0d%0aContent-Type:%20text/html%0d%0aContent-Length:%2025%0d%0a%0d%0a%3Cscript%3Ealert(1)%3C/script%3E" to the "query_value". This payload is designed to perform an HTTP response splitting attack by injecting a malicious script.

Validation

The template validates the response payload by checking if it contains either the string "<script>alert(1)</script>". If the response contains this string, it indicates that the attack was successful.

Frequently asked questions

What is HTTP Response Splitting and how does it work

What are the potential impacts of CRLF injections

How does the provided array mitigate CRLF injection attacks

What are the potential risks associated with CRLF injection vulnerabilities

How can developers prevent CRLF injection vulnerabilities

Are there any specific tools or frameworks available for detecting and mitigating CRLF injection vulnerabilities

Loved by security teams!

"We are absolutely thrilled with the testing feature of Akto. We have used it on our graphQL endpoints and it performs flawlessly identifying common API security issues. It's truly a game-changer and we highly recommend Akto to anyone looking to effortlessly secure their API endpoints. With a user-friendly interface, it's the perfect solution for anyone looking to embrace custom rules with context to reduce false positives."

Security team,

Loom

Security team,

Loom

Security team,

Loom

"The text editor in Akto is absolutely remarkable. Its user-friendly YAML format strikes the perfect balance between simplicity and power. With intuitive features like 'API selection filter', 'Execute', Validate' creating test rules becomes incredibly easy. Akto's test editor is a game-changer, enabling seamless creation of highly personalized and effective tests that could meet the needs of any modern day organization. "