CVE-2021-38505 Information

Description

Microsoft introduced a new feature in Windows 10 known as Cloud Clipboard which if enabled will record data copied to the clipboard to the cloud and make it available on other computers in certain scenarios. Applications that wish to prevent copied data from being recorded in Cloud History must use specific clipboard formats; and Firefox before versions 94 and ESR 91.3 did not implement them. This could have caused sensitive data to be recorded to a user’s Microsoft account. This bug only affects Firefox for Windows 10+ with Cloud Clipboard enabled. Other operating systems are unaffected.. This vulnerability affects Firefox < 94 Thunderbird < 91.3 and Firefox ESR < 91.3.

CVSS Vector

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

Reference

https://www.mozilla.org/security/advisories/mfsa2021-50/ https://www.mozilla.org/security/advisories/mfsa2021-49/ https://bugzilla.mozilla.org/show_bug.cgi?id=1730194 https://www.mozilla.org/security/advisories/mfsa2021-48/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

6.5