CVE-2020-6821

Mozilla: Uninitialized memory could be read when using the WebGL copyTexSubImage method

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

When reading from areas partially or fully outside the source resource with WebGL's <code>copyTexSubImage</code> method, the specification requires the returned values be zero. Previously, this memory was uninitialized, leading to potentially sensitive data disclosure. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.

Cuando se lee desde áreas parcial o completamente fuera del recurso fuente con el método <code>copyTexSubImage</code> de WebGL, la especificación requiere que los valores devueltos sean cero. Anteriormente, esta memoria no fue inicializada, conllevando a una divulgación de datos potencialmente confidenciales. Esta vulnerabilidad afecta a Thunderbird versiones anteriores a 68.7.0, Firefox ESR versiones anteriores a 68.7 y Firefox versiones anteriores a 75.

The Mozilla Foundation Security Advisory describes this flaw as:

When reading from areas partially or fully outside the source resource with WebGL's copyTexSubImage method, the specification requires the returned values be zero. Previously, this memory was uninitialized, leading to potentially sensitive data disclosure.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-01-10 CVE Reserved
2020-04-08 CVE Published
2024-02-27 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-908: Use of Uninitialized Resource

CAPEC

References (6)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://usn.ubuntu.com/4335-1	2021-07-21
https://www.mozilla.org/security/advisories/mfsa2020-12	2021-07-21
https://www.mozilla.org/security/advisories/mfsa2020-13	2021-07-21
https://www.mozilla.org/security/advisories/mfsa2020-14	2021-07-21
https://access.redhat.com/security/cve/CVE-2020-6821	2020-04-16
https://bugzilla.redhat.com/show_bug.cgi?id=1821674	2020-04-16

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"				< 75.0 Search vendor "Mozilla" for product "Firefox" and version " < 75.0"		-		Affected
Mozilla Search vendor "Mozilla"		Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"				< 68.7.0 Search vendor "Mozilla" for product "Firefox Esr" and version " < 68.7.0"		-		Affected
Mozilla Search vendor "Mozilla"		Thunderbird Search vendor "Mozilla" for product "Thunderbird"				< 68.7.0 Search vendor "Mozilla" for product "Thunderbird" and version " < 68.7.0"		-		Affected