CVE-2020-6822

Mozilla: Out of bounds write in GMPDecodeData when processing large images

Severity Score

8.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

On 32-bit builds, an out of bounds write could have occurred when processing an image larger than 4 GB in <code>GMPDecodeData</code>. It is possible that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.

En las compilaciones de 32 bits, podría haber ocurrido una escritura fuera de límites al procesar una imagen de más de 4 GB en (code)GMPDecodeData(/code). Es posible que con suficiente esfuerzo esto podría haber sido explotado para ejecutar código arbitrario. Esta vulnerabilidad afecta a Thunderbird versiones anteriores a la versión 68.7.0, Firefox ESR versiones anteriores a la versión 68.7 y Firefox versiones anteriores a 75.

The Mozilla Foundation Security Advisory describes this flaw as:

On 32-bit builds, an out of bounds write could have occurred when processing an image larger than 4 GB in GMPDecodeData. It is possible that with enough effort this could have been exploited to run arbitrary code.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* 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-787: Out-of-bounds Write

CAPEC

References (6)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://usn.ubuntu.com/4335-1	2020-05-01
https://www.mozilla.org/security/advisories/mfsa2020-12	2020-05-01
https://www.mozilla.org/security/advisories/mfsa2020-13	2020-05-01
https://www.mozilla.org/security/advisories/mfsa2020-14	2020-05-01
https://access.redhat.com/security/cve/CVE-2020-6822	2020-04-16
https://bugzilla.redhat.com/show_bug.cgi?id=1821676	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