CVE-2020-5207: Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

January 27, 2020 (updated January 8, 2021)

In Ktor before 1.3.0, request smuggling is possible when running behind a proxy that doesn’t handle Content-Length and Transfer-Encoding properly or doesn’t handle \n as a headers separator.

References

github.com/advisories/GHSA-xrr9-rh8p-433v
github.com/ktorio/ktor/pull/1547
github.com/ktorio/ktor/security/advisories/GHSA-xrr9-rh8p-433v
nvd.nist.gov/vuln/detail/CVE-2020-5207

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