@aikidosec/firewall/vulnerabilities/ssrf/imds.js

Zen by Aikido is an embedded Web Application Firewall that autonomously protects Node.js apps against common and critical attacks

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.isIMDSIPAddress = isIMDSIPAddress;
exports.isTrustedHostname = isTrustedHostname;
const IPMatcher_1 = require("../../helpers/ip-matcher/IPMatcher");
const IMDSAddresses = new IPMatcher_1.IPMatcher();
// This IP address is used by AWS EC2 instances to access the instance metadata service (IMDS)
// We should block any requests to these IP addresses
// This prevents STORED SSRF attacks that try to access the instance metadata service
IMDSAddresses.add("169.254.169.254");
IMDSAddresses.add("fd00:ec2::254");
function isIMDSIPAddress(ip) {
    return IMDSAddresses.has(ip);
}
// Google cloud uses the same IP addresses for its metadata service
// However, you need to set specific headers to access it
// In order to not block legitimate requests, we should allow the IP addresses for Google Cloud
const trustedHosts = ["metadata.google.internal", "metadata.goog"];
function isTrustedHostname(hostname) {
    return trustedHosts.includes(hostname);
}