CVE-2019-11747

Mozilla: 'Forget about this site' removes sites from pre-loaded HSTS list

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The "Forget about this site" feature in the History pane is intended to remove all saved user data that indicates a user has visited a site. This includes removing any HTTP Strict Transport Security (HSTS) settings received from sites that use it. Due to a bug, sites on the pre-load list also have their HSTS setting removed. On the next visit to that site if the user specifies an http: URL rather than secure https: they will not be protected by the pre-loaded HSTS setting. After that visit the site's HSTS setting will be restored. This vulnerability affects Firefox < 69 and Firefox ESR < 68.1.

La funcionalidad "Forget about this site" en el panel History tiene como objetivo suprimir todos los datos de usuario guardados que indican que un usuario ha visitado un sitio. Esto incluye eliminar cualquier configuración de HTTP Strict Transport Security (HSTS) recibida desde los sitios que la usan. Debido a un bug, los sitios en la lista de precarga también tienen su configuración HSTS eliminada. En la próxima visita a ese sitio, si el usuario especifica una URL http: en lugar de https: seguro, no estará protegido por la configuración HSTS precargada. Después de esa visita, la configuración HSTS del sitio será restablecida. Esta vulnerabilidad afecta a Firefox versiones anteriores a 69 y Firefox ESR versiones anteriores a 68.1.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

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

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

CWE

CWE-358: Improperly Implemented Security Check for Standard
CWE-665: Improper Initialization

CAPEC

References (6)

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
https://access.redhat.com/security/cve/CVE-2019-11747	2019-09-04
https://bugzilla.redhat.com/show_bug.cgi?id=1748664	2019-09-04

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
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