CVE-2019-11736

Severity Score

7.0

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The Mozilla Maintenance Service does not guard against files being hardlinked to another file in the updates directory, allowing for the replacement of local files, including the Maintenance Service executable, which is run with privileged access. Additionally, there was a race condition during checks for junctions and symbolic links by the Maintenance Service, allowing for potential local file and directory manipulation to be undetected in some circumstances. This allows for potential privilege escalation by a user with unprivileged local access. <br>*Note: These attacks requires local system access and only affects Windows. Other operating systems are not affected.*. This vulnerability affects Firefox < 69 and Firefox ESR < 68.1.

El Servicio de Mantenimiento de Mozilla no evita que los archivos se vinculen físicamente a otro archivo en el directorio de actualizaciones, lo que permite la sustitución de archivos locales, incluyendo el ejecutable del Servicio de Mantenimiento, que es ejecutado con acceso privilegiado. Además, hubo una condición de carrera durante las comprobaciones de uniones y enlaces simbólicos por parte del Servicio de Mantenimiento, permitiendo que no se detectara la potencial manipulación local de archivos y directorios en algunas circunstancias. Esto permite la escalada potencial de privilegios por parte de un usuario con acceso local no privilegiado. <br>*Nota: estos ataques requieren acceso al sistema local y solo afectan a Windows. Otros sistemas operativos no están afectados.*. Esta vulnerabilidad afecta a Firefox versiones anteriores a 69 y Firefox ESR versiones anteriores a 68.1.

*Credits: N/A

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

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

2019-05-03 CVE Reserved
2019-09-27 CVE Published
2024-08-04 CVE Updated
2024-09-20 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CAPEC

References (4)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html	2019-10-05
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html	2019-10-05
https://www.mozilla.org/security/advisories/mfsa2019-25	2019-10-05
https://www.mozilla.org/security/advisories/mfsa2019-26	2019-10-05

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"	< 69.0 Search vendor "Mozilla" for product "Firefox" and version " < 69.0"	-	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe
Mozilla Search vendor "Mozilla"	Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"	< 68.1.0 Search vendor "Mozilla" for product "Firefox Esr" and version " < 68.1.0"	-	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe