CVE-2020-7787 Information

Description

This affects all versions of package react-adal. It is possible for a specially crafted JWT token and request URL can cause the nonce session and refresh values to be incorrectly validated causing the application to treat an attacker-generated JWT token as authentic. The logical defect is caused by how the nonce session and refresh values are stored in the browser local storage or session storage. Each key is automatically appended by ||. When the received nonce and session keys are generated the list of values is stored in the browser storage separated by || with || always appended to the end of the list. Since || will always be the last 2 characters of the stored values an empty string () will always be in the list of the valid values. Therefore if an empty session parameter is provided in the callback URL and a specially-crafted JWT token contains an nonce value of \ (empty string) then adal.js will consider the JWT token as authentic.

CVSS Vector

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

Reference

https://snyk.io/vuln/SNYK-JS-REACTADAL-1018907 https://github.com/salvoravida/react-adal/pull/115

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

LOW

Base Score

NONE

Base Severity

8.2