CVE-2020-26976

Mozilla: HTTPS pages could have been intercepted by a registered service worker when they should not have been

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

When a HTTPS pages was embedded in a HTTP page, and there was a service worker registered for the former, the service worker could have intercepted the request for the secure page despite the iframe not being a secure context due to the (insecure) framing. This vulnerability affects Firefox < 84.

Cuando una página HTTPS estaba insertada en una página HTTP, y había un trabajador de servicio registrado para la primera, el trabajador de servicio podría haber interceptado la petición de la página segura a pesar de que el iframe no estaba en un contexto seguro debido al framing (no seguro). Esta vulnerabilidad afecta a Firefox versiones anteriores a 84

The Mozilla Foundation Security Advisory describes this flaw as:

When a HTTPS page was embedded in a HTTP page, and there was a service worker registered for the former, the service worker could have intercepted the request for the secure page despite the iframe not being a secure context due to the (insecure) framing.

*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

2020-10-12 CVE Reserved
2020-12-16 CVE Published
2024-03-10 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

CAPEC

References (8)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2021/02/msg00001.html	Mailing List
https://lists.debian.org/debian-lts-announce/2021/02/msg00002.html	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://security.gentoo.org/glsa/202102-02	2021-02-15
https://www.debian.org/security/2021/dsa-4840	2021-02-15
https://www.debian.org/security/2021/dsa-4842	2021-02-15
https://www.mozilla.org/security/advisories/mfsa2020-54	2021-02-15
https://access.redhat.com/security/cve/CVE-2020-26976	2021-02-03
https://bugzilla.redhat.com/show_bug.cgi?id=1920649	2021-02-03

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"				< 84.0 Search vendor "Mozilla" for product "Firefox" and version " < 84.0"		-		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
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected