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Envoy Proxy Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling) Vulnerability - CVE-2023-27493 - Vulnerability Database
Envoy Proxy

Envoy Proxy Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling) Vulnerability - CVE-2023-27493

Critical
Reference: CVE-2023-27493
NVD Link: https://nvd.nist.gov/vuln/detail/CVE-2023-27493
Title: Envoy Proxy Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling) Vulnerability
Overview:

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.26.0 1.25.3 1.24.4 1.23.6 and 1.22.9 Envoy does not sanitize or escape request properties when generating request headers. This can lead to characters that are illegal in header values to be sent to the upstream service. In the worst case it can cause upstream service to interpret the original request as two pipelined requests possibly bypassing the intent of Envoys security policy. Versions 1.26.0 1.25.3 1.24.4 1.23.6 and 1.22.9 contain a patch. As a workaround disable adding request headers based on the downstream request properties such as downstream certificate properties.