CVE-2019-9793

Mozilla: Improper bounds checks when Spectre mitigations are disabled

Severity Score

5.9

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A mechanism was discovered that removes some bounds checking for string, array, or typed array accesses if Spectre mitigations have been disabled. This vulnerability could allow an attacker to create an arbitrary value in compiled JavaScript, for which the range analysis will infer a fully controlled, incorrect range in circumstances where users have explicitly disabled Spectre mitigations. *Note: Spectre mitigations are currently enabled for all users by default settings.*. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

Se encontró un mecanismo que elimina algunos límites para comprobar los accesos de cadenas, matrices o matrices escritas si se han deshabilitado las mitigaciones de Specter. Esta vulnerabilidad podría permitir a un atacante crear un valor arbitrario en JavaScript compilado, para el cual el análisis de rango inferirá un rango totalmente controlado e incorrecto en circunstancias donde los usuarios han inhabilitado explícitamente las mitigaciones de Spectre. * Nota: las configuraciones de Specter están actualmente habilitadas para todos los usuarios por la configuración por defecto. *. Esta vulnerabilidad inpacta a Thunderbird versión <60.6, Firefox ESR versión <60.6 y Firefox versión <66

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-03-14 CVE Reserved
2019-03-20 CVE Published
2024-04-19 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

CAPEC

References (7)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2019:0966	2019-05-13
https://access.redhat.com/errata/RHSA-2019:1144	2019-05-13
https://www.mozilla.org/security/advisories/mfsa2019-07	2019-05-13
https://www.mozilla.org/security/advisories/mfsa2019-08	2019-05-13
https://www.mozilla.org/security/advisories/mfsa2019-11	2019-05-13
https://access.redhat.com/security/cve/CVE-2019-9793	2019-05-13
https://bugzilla.redhat.com/show_bug.cgi?id=1690678	2019-05-13

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"				< 66.0 Search vendor "Mozilla" for product "Firefox" and version " < 66.0"		-		Affected
Mozilla Search vendor "Mozilla"		Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"				< 60.6 Search vendor "Mozilla" for product "Firefox Esr" and version " < 60.6"		-		Affected
Mozilla Search vendor "Mozilla"		Thunderbird Search vendor "Mozilla" for product "Thunderbird"				< 60.6 Search vendor "Mozilla" for product "Thunderbird" and version " < 60.6"		-		Affected