CVE-2020-26291 Information

Description

URI.js is a javascript URL mutation library (npm package urijs). In URI.js before version 1.19.4 the hostname can be spoofed by using a backslash (\) character followed by an at (@) character. 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. For example the URL https://expected-example.com\@observed-example.com will incorrectly return observed-example.com if using an affected version. Patched versions correctly return expected-example.com. Patched versions match the behavior of other parsers which implement the WHATWG URL specification including web browsers and Node’s built-in URL class. Version 1.19.4 is patched against all known payload variants. Version 1.19.3 has a partial patch but is still vulnerable to a payload variant.]

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Reference

https://www.npmjs.com/package/urijs https://github.com/medialize/URI.js/security/advisories/GHSA-3329-pjwv-fjpg https://github.com/medialize/URI.js/releases/tag/v1.19.4 https://github.com/medialize/URI.js/commit/b02bf037c99ac9316b77ff8bfd840e90becf1155

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

6.5