CVE-2018-12396

Mozilla: WebExtension content scripts can execute in disallowed contexts

Severity Score

6.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A vulnerability where a WebExtension can run content scripts in disallowed contexts following navigation or other events. This allows for potential privilege escalation by the WebExtension on sites where content scripts should not be run. This vulnerability affects Firefox ESR < 60.3 and Firefox < 63.

Una vulnerabilidad en la que WebExtensions pueden ejecutar scripts de contenido en contextos no permitidos tras una navegación u otros eventos. Esto permite el escalado de privilegios potencial mediante WebExtensions en sitios en los que los scripts de contenido no deberían ejecutarse. La vulnerabilidad afecta a Firefox ESR en versiones anteriores a la 60.3 y Firefox en versiones anteriores a la 63.

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. This update upgrades Firefox to version 60.3.0 ESR. Issues addressed include a bypass vulnerability.

*Credits: N/A

CVSS Scores

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

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

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

2018-06-14 CVE Reserved
2018-10-25 CVE Published
2024-08-05 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-284: Improper Access Control
CWE-732: Incorrect Permission Assignment for Critical Resource

CAPEC

References (13)

URL	Tag	Source
http://www.securityfocus.com/bid/105718	Third Party Advisory
http://www.securitytracker.com/id/1041944	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/11/msg00008.html	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2018:3005	2019-10-03
https://access.redhat.com/errata/RHSA-2018:3006	2019-10-03
https://bugzilla.mozilla.org/show_bug.cgi?id=1483602	2019-10-03
https://security.gentoo.org/glsa/201811-04	2019-10-03
https://usn.ubuntu.com/3801-1	2019-10-03
https://www.debian.org/security/2018/dsa-4324	2019-10-03
https://www.mozilla.org/security/advisories/mfsa2018-26	2019-10-03
https://www.mozilla.org/security/advisories/mfsa2018-27	2019-10-03
https://access.redhat.com/security/cve/CVE-2018-12396	2018-10-24
https://bugzilla.redhat.com/show_bug.cgi?id=1642186	2018-10-24

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"				< 63.0 Search vendor "Mozilla" for product "Firefox" and version " < 63.0"		-		Affected
Mozilla Search vendor "Mozilla"		Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"				< 60.3 Search vendor "Mozilla" for product "Firefox Esr" and version " < 60.3"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				18.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				18.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.10"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Desktop Search vendor "Redhat" for product "Enterprise Linux Desktop"				6.0 Search vendor "Redhat" for product "Enterprise Linux Desktop" and version "6.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Desktop Search vendor "Redhat" for product "Enterprise Linux Desktop"				7.0 Search vendor "Redhat" for product "Enterprise Linux Desktop" and version "7.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Server Search vendor "Redhat" for product "Enterprise Linux Server"				6.0 Search vendor "Redhat" for product "Enterprise Linux Server" and version "6.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Server Search vendor "Redhat" for product "Enterprise Linux Server"				7.0 Search vendor "Redhat" for product "Enterprise Linux Server" and version "7.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Server Aus Search vendor "Redhat" for product "Enterprise Linux Server Aus"				7.6 Search vendor "Redhat" for product "Enterprise Linux Server Aus" and version "7.6"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Server Eus Search vendor "Redhat" for product "Enterprise Linux Server Eus"				7.6 Search vendor "Redhat" for product "Enterprise Linux Server Eus" and version "7.6"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Server Tus Search vendor "Redhat" for product "Enterprise Linux Server Tus"				7.6 Search vendor "Redhat" for product "Enterprise Linux Server Tus" and version "7.6"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Workstation Search vendor "Redhat" for product "Enterprise Linux Workstation"				6.0 Search vendor "Redhat" for product "Enterprise Linux Workstation" and version "6.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Workstation Search vendor "Redhat" for product "Enterprise Linux Workstation"				7.0 Search vendor "Redhat" for product "Enterprise Linux Workstation" and version "7.0"		-		Affected