HTTP Response Splitting Affecting github.com/apple/swift-nio package, versions <2.29.1>=2.30.0 <2.39.1>=2.40.0 <2.42.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-SWIFT-APPLESWIFTNIO-3105796
- published28 Sept 2022
- disclosed22 Aug 2022
- creditAlessio Della Libera of Snyk Research Team
Introduced: 22 Aug 2022
CVE-2022-3215 (opens in a new tab)How to fix?
Upgrade apple/swift-nio to version 2.29.1, 2.39.1, 2.42.0 or higher.
Overview
apple/swift-nio is an event-driven network application framework for high performance protocol servers & clients, non-blocking.
Affected versions of this package are vulnerable to HTTP Response Splitting. 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 a default channel handler that polices outbound headers. This channel handler is added by default to channel pipelines, but can be removed by users if they are doing this validation themselves.