Apple SwiftNIO Header response splitting

Summaryinfo

A vulnerability described as critical has been identified in Apple SwiftNIO. The impacted element is an unknown function of the component Header Handler. Executing a manipulation can lead to response splitting. This vulnerability appears as CVE-2022-3215. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Apple SwiftNIO (unknown version). It has been declared as critical. This vulnerability affects an unknown code block of the component Header Handler. The manipulation with an unknown input leads to a response splitting vulnerability. The CWE definition for the vulnerability is CWE-113. The product receives data from an HTTP agent/component (e.g., web server, proxy, browser, etc.), but it does not neutralize or incorrectly neutralizes CR and LF characters before the data is included in outgoing HTTP headers. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

NIOHTTP1 and projects using it for generating HTTP responses can be subject to a HTTP Response Injection attack. This occurs when a HTTP/1.1 server accepts user generated input from an incoming request and reflects it into a HTTP/1.1 response header in some form. A malicious user can add newlines to their input (usually in encoded form) and "inject" those newlines into the returned HTTP response. This capability allows users to work around security headers and HTTP/1.1 framing headers by injecting entirely false responses or other new headers. The injected false responses may also be treated as the response to subsequent requests, which can lead to XSS, cache poisoning, and a number of other flaws. This issue was resolved by adding validation to the HTTPHeaders type, ensuring that there's no whitespace incorrectly present in the HTTP headers provided by users. As the existing API surface is non-failable, all invalid characters are replaced by linear whitespace.

The weakness was presented 09/29/2022 as GHSA-7fj7-39wj-c64f. The advisory is shared for download at github.com. This vulnerability was named CVE-2022-3215 since 09/14/2022. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 10/25/2022).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Apple

Name

• SwiftNIO

License

• commercial

Website

• Vendor: https://www.apple.com/

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