CVE-2021-43532 Information

Description

The ‘Copy Image Link’ context menu action would copy the final image URL after redirects. By embedding an image that triggered authentication flows - in conjunction with a Content Security Policy that stopped a redirection chain in the middle - the final image URL could be one that contained an authentication token used to takeover a user account. If a website tricked a user into copy and pasting the image link back to the page the page would be able to steal the authentication tokens. This was fixed by making the action return the original URL before any redirects. This vulnerability affects Firefox < 94.

CVSS Vector

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

Reference

https://bugzilla.mozilla.org/show_bug.cgi?id=1719203 https://www.mozilla.org/security/advisories/mfsa2021-48/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

NONE

Base Severity

6.1