CVE-2021-38505

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Microsoft introdujo una nueva función en Windows 10 conocida como Cloud Clipboard que, si está activada, registrará en la nube los datos copiados en el portapapeles y los hará disponibles en otros ordenadores en determinados escenarios. Las aplicaciones que deseen evitar que los datos copiados se registren en el Historial de la Nube deben usar formatos específicos del portapapeles; y Firefox versiones anteriores a 94 y ESR 91.3 no los implementaba. Esto podría haber causado el registro de datos confidenciales en la cuenta de Microsoft de un usuario. *Este bug solo afecta a Firefox para Windows 10+ con Cloud Clipboard habilitado. Otros sistemas operativos no están afectados*. Esta vulnerabilidad afecta a Firefox versiones anteriores a 94, Thunderbird versiones anteriores a 91.3 y Firefox ESR versiones anteriores a 91.3

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-08-10 CVE Reserved
2021-12-08 CVE Published
2024-08-04 CVE Updated
2024-08-23 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-668: Exposure of Resource to Wrong Sphere

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.mozilla.org/security/advisories/mfsa2021-48	2021-12-10
https://www.mozilla.org/security/advisories/mfsa2021-49	2021-12-10
https://www.mozilla.org/security/advisories/mfsa2021-50	2021-12-10

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mozilla Search vendor "Mozilla"	Firefox Search vendor "Mozilla" for product "Firefox"	< 94.0 Search vendor "Mozilla" for product "Firefox" and version " < 94.0"	-	Affected	in	Microsoft Search vendor "Microsoft"	Windows 10 Search vendor "Microsoft" for product "Windows 10"	*	-	Safe
Mozilla Search vendor "Mozilla"	Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"	< 91.3.0 Search vendor "Mozilla" for product "Firefox Esr" and version " < 91.3.0"	-	Affected	in	Microsoft Search vendor "Microsoft"	Windows 10 Search vendor "Microsoft" for product "Windows 10"	*	-	Safe
Mozilla Search vendor "Mozilla"	Thunderbird Search vendor "Mozilla" for product "Thunderbird"	< 91.3.0 Search vendor "Mozilla" for product "Thunderbird" and version " < 91.3.0"	-	Affected	in	Microsoft Search vendor "Microsoft"	Windows 10 Search vendor "Microsoft" for product "Windows 10"	*	-	Safe