CVE-2020-15676

Mozilla: XSS when pasting attacker-controlled data into a contenteditable element

Severity Score

6.1

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Firefox sometimes ran the onload handler for SVG elements that the DOM sanitizer decided to remove, resulting in JavaScript being executed after pasting attacker-controlled data into a contenteditable element. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.

Firefox a veces ejecutaba el manejador de carga para elementos SVG que el saneador DOM decidió eliminar, resultando en que el JavaScript sea ejecutado después de pegar los datos controlados por el atacante en un elemento satisfactorio. Esta vulnerabilidad afecta a Firefox versiones anteriores a 81, Thunderbird versiones anteriores a 78.3, y Firefox ESR versiones anteriores a 78.3

The Mozilla Foundation Security Advisory describes this flaw as:

Firefox sometimes ran the onload handler for SVG elements that the DOM sanitizer decided to remove, resulting in JavaScript being executed after pasting attacker-controlled data into a contenteditable element.

*Credits: N/A

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

2020-07-10 CVE Reserved
2020-09-24 CVE Published
2024-08-04 CVE Updated
2024-08-05 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CAPEC

References (10)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2020/10/msg00020.html	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00074.html	2022-11-16
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00077.html	2022-11-16
https://security.gentoo.org/glsa/202010-02	2022-11-16
https://www.debian.org/security/2020/dsa-4770	2022-11-16
https://www.mozilla.org/security/advisories/mfsa2020-42	2022-11-16
https://www.mozilla.org/security/advisories/mfsa2020-43	2022-11-16
https://www.mozilla.org/security/advisories/mfsa2020-44	2022-11-16
https://access.redhat.com/security/cve/CVE-2020-15676	2020-10-01
https://bugzilla.redhat.com/show_bug.cgi?id=1881665	2020-10-01

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"				< 81.0 Search vendor "Mozilla" for product "Firefox" and version " < 81.0"		-		Affected
Mozilla Search vendor "Mozilla"		Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"				< 78.3 Search vendor "Mozilla" for product "Firefox Esr" and version " < 78.3"		-		Affected
Mozilla Search vendor "Mozilla"		Thunderbird Search vendor "Mozilla" for product "Thunderbird"				< 78.3 Search vendor "Mozilla" for product "Thunderbird" and version " < 78.3"		-		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
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				15.1 Search vendor "Opensuse" for product "Leap" and version "15.1"		-		Affected
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				15.2 Search vendor "Opensuse" for product "Leap" and version "15.2"		-		Affected