CVE-2021-21277 – angular-expressions

Package

Manager: npm
Name: angular-expressions
Vulnerable Version: >=0 <1.1.2

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EPSS: 0.00722 pctl0.71663

Details

Angular Expressions - Remote Code Execution ### Impact The vulnerability, reported by GoSecure Inc, allows Remote Code Execution, if you call `expressions.compile(userControlledInput)` where `userControlledInput` is text that comes from user input. This time, the security of the package could be bypassed by using a more complex payload, using a `.constructor.constructor` technique. * If running angular-expressions in the browser, an attacker could run any browser script when the application code calls expressions.compile(userControlledInput). * If running angular-expressions on the server, an attacker could run any Javascript expression, thus gaining Remote Code Execution. ### Patches Users should upgrade to version 1.1.2 of angular-expressions ### Workarounds A temporary workaround might be either to : * disable user-controlled input that will be fed into angular-expressions in your application OR * allow only following characters in the userControlledInput : ```js if (/^[|a-zA-Z.0-9 :"'+-?]+$/.test(userControlledInput)) { var result = expressions.compile(userControlledInput); } else { result = undefined; } ``` ### References [Removal of angular-expression sandbox](http://blog.angularjs.org/2016/09/angular-16-expression-sandbox-removal.html) ### For more information If you have any questions or comments about this advisory: * Open an issue in [angular-expressions](https://github.com/peerigon/angular-expressions/issues) * [Email us](mailto:contact@javascript-ninja.fr) ### Credits The issue was reported by Maxime Nadeau from GoSecure, Inc.

Metadata

Created: 2021-02-01T15:01:26Z
Modified: 2022-10-20T13:26:13Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/02/GHSA-j6px-jwvv-vpwq/GHSA-j6px-jwvv-vpwq.json
CWE IDs: ["CWE-74", "CWE-94"]
Alternative ID: GHSA-j6px-jwvv-vpwq
Finding: F184
Auto approve: 1