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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>
19 lines
534 B
JavaScript
19 lines
534 B
JavaScript
const http = require('http');
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// BAD: a hand-written RFC 1918 / loopback / metadata denylist matched against the
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// host string. The embedded IPv4 inside `::ffff:10.0.0.1` is never seen.
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function checkTargetHost(host) { // NOT OK
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if (
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host === '127.0.0.1' ||
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host === '169.254.169.254' ||
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host.startsWith('10.') ||
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host.startsWith('192.168') ||
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host.startsWith('172.16')
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) {
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throw new Error('blocked internal host');
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}
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return http.get('http://' + host + '/');
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}
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module.exports = { checkTargetHost };
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