CVE-2021-3647: Open Redirect in medialize/URI.js
First published: Fri Jul 16 2021(Updated: )
### Impact If using affected versions to determine a URL's hostname, the hostname can be spoofed by using a combination of backslash (`\`) and slash (`/`) characters as part of the scheme delimiter, e.g. `scheme:/\/\/\hostname`. If the hostname is used in security decisions, the decision may be incorrect. Depending on library usage and attacker intent, impacts may include allow/block list bypasses, SSRF attacks, open redirects, or other undesired behavior. Example URL: `https:/\/\/\expected-example.com/path` Escaped string: `https:/\\/\\/\\expected-example.com/path` (JavaScript strings must escape backslash) Affected versions incorrectly return no hostname. Patched versions correctly return `expected-example.com`. Patched versions match the behavior of other parsers which implement the [WHATWG URL specification](https://url.spec.whatwg.org/), including web browsers and [Node's built-in URL class](https://nodejs.org/api/url.html). ### Patches Version 1.19.7 is patched against all known payload variants. ### References https://github.com/medialize/URI.js/releases/tag/v1.19.7 (fix for this particular bypass) https://github.com/medialize/URI.js/releases/tag/v1.19.6 (fix for related bypass) https://github.com/medialize/URI.js/releases/tag/v1.19.4 (fix for related bypass) https://github.com/medialize/URI.js/releases/tag/v1.19.3 (fix for related bypass) [PR #233](https://github.com/medialize/URI.js/pull/233) (initial fix for backslash handling) ### For more information If you have any questions or comments about this advisory, open an issue in https://github.com/medialize/URI.js ### Reporter credit [ready-research](https://github.com/ready-research) via https://huntr.dev/
Credit: security@huntr.dev
| Affected Software | Affected Version | How to fix |
|---|---|---|
| npm/urijs | <1.19.7 | 1.19.7 |
| Uri.js Project Uri.js | <1.19.7 |
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Reference Links
- https://github.com/medialize/URI.js/security/advisories/GHSA-89gv-h8wf-cg8r
- https://github.com/medialize/URI.js/pull/233
- https://github.com/medialize/URI.js/releases/tag/v1.19.3
- https://github.com/medialize/URI.js/releases/tag/v1.19.4
- https://github.com/medialize/URI.js/releases/tag/v1.19.6
- https://github.com/medialize/URI.js/releases/tag/v1.19.7
- https://nvd.nist.gov/vuln/detail/CVE-2021-3647
- https://github.com/medialize/URI.js/commit/ac43ca8f80c042f0256fb551ea5203863dec4481
- https://huntr.dev/bounties/1625558772840-medialize/URI.js
- https://github.com/advisories/GHSA-89gv-h8wf-cg8r (Advisory)
- https://exchange.xforce.ibmcloud.com/vulnerabilities/205639
- https://www.ibm.com/support/pages/node/6517470 (Advisory)
Frequently Asked Questions
What is CVE-2021-3647?
CVE-2021-3647 is a vulnerability in URI.js that allows for URL redirection to an untrusted site.
How does CVE-2021-3647 impact the affected software?
CVE-2021-3647 allows the hostname in a URL to be spoofed, which can lead to incorrect security decisions.
What is the severity of CVE-2021-3647?
CVE-2021-3647 has a severity rating of high with a CVSS score of 7.4.
How can I fix CVE-2021-3647?
To fix CVE-2021-3647, upgrade to URI.js version 1.19.7 or newer.
Where can I find more information about CVE-2021-3647?
You can find more information about CVE-2021-3647 in the following references: [GitHub Advisory](https://github.com/medialize/URI.js/security/advisories/GHSA-89gv-h8wf-cg8r), [GitHub Pull Request](https://github.com/medialize/URI.js/pull/233), [GitHub Release](https://github.com/medialize/URI.js/releases/tag/v1.19.3).
- collector/github-advisory-latest
- alias/GHSA-89gv-h8wf-cg8r
- alias/CVE-2021-3647
- collector/github-advisory
- collector/nvd-index
- agent/references
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- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/author
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- agent/last-modified-date
- agent/description
- agent/first-publish-date
- agent/event
- collector/ibm-support
- source/IBM
- agent/tags
- agent/trending
- package-manager/npm
- vendor/uri.js project
- canonical/uri.js project uri.js