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e93bc11f6f
Add javascript/ssrf-ipv6-transition-incomplete-guard, an experimental @kind problem query that flags hand-rolled SSRF host guards which reject private/loopback IPv4 ranges but never unwrap IPv6-transition forms (IPv4-mapped ::ffff:, NAT64 64:ff9b::, 6to4 2002::). Such guards can be bypassed by wrapping an internal IPv4 address in a transition literal. Includes a .qhelp with good/bad examples, a change note, and a test pack with two true-positive fixtures (private-ip package guard and a hand-written RFC 1918 denylist) and two negative-control fixtures (ipaddr.js range classifier and an explicit ::ffff: unwrap). Signed-off-by: tonghuaroot <23011166+tonghuaroot@users.noreply.github.com>
14 lines
446 B
JavaScript
14 lines
446 B
JavaScript
const isPrivate = require('private-ip');
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const fetch = require('node-fetch');
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// BAD: `private-ip` classifies the textual IPv4 form only. It returns false for
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// `::ffff:169.254.169.254`, so a transition-wrapped internal address slips past.
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async function validateUrlHost(host) { // NOT OK
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if (isPrivate(host)) {
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throw new Error('blocked private host');
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}
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return fetch('http://' + host + '/');
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}
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module.exports = { validateUrlHost };
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