Incorrect concatenation of multiple value request headers in ext-authz extension

Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions when ext-authz extension is sending request headers to the external authorization service it must merge multiple value headers according to the HTTP spec. However, only the last header value is sent. This may allow specifically crafted requests to bypass authorization. Attackers may be able to escalate privileges when using ext-authz extension or back end service that uses multiple value headers for authorization. A specifically constructed request may be delivered by an untrusted downstream peer in the presence of ext-authz extension. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to the ext-authz extension to correctly merge multiple request header values, when sending request for authorization.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

不正确的行为次序：在解析与净化处理之前进行授权

Envoy 安全漏洞

Envoy是一款开源的分布式代理服务器。 Envoy 中存在安全漏洞。该漏洞允许攻击者绕过使用 ext_authz 扩展名的规则策略。 来自此漏洞的最大威胁是机密性、完整性以及系统可用性。

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