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Advisories

Ocelot - IP Allow/Block List Bypass for WebSocket Upgrade Requests

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severity
critical
date
Affecting

  • Ocelot <= 24.1.0, fixed in commit f156fd4

CWE
  • CWE-288 Authentication Bypass Using an Alternate Path or Channel
CVSS
9.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Credit
George Chen
Description
Ocelot through 24.1.0, fixed in commit f156fd4, contains a security control bypass vulnerability that allows denied clients to circumvent IP-based access restrictions by sending WebSocket upgrade requests. The WebSocket upgrade pipeline branch configured via MapWhen in OcelotPipelineExtensions.cs omits SecurityMiddleware, causing requests from blocked IP addresses to be proxied to downstream services without enforcement of the configured allow/block list.

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