CVE-2021-39183

Unsafe inline XSS Owncast

Severity Score

6.1

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Owncast is an open source, self-hosted live video streaming and chat server. In affected versions inline scripts are executed when Javascript is parsed via a paste action. This issue is patched in 0.0.9 by blocking unsafe-inline Content Security Policy and specifying the script-src. The worker-src is required to be set to blob for the video player.

Owncast es un servidor de chat y transmisión de vídeo en directo de código abierto y autoalojado. En las versiones afectadas son ejecutados scripts en línea cuando es analizado Javascript mediante una acción de pegado. Este problema está parcheado en la versión 0.0.9 al bloquear la política de seguridad de contenidos unsafe-inline y la especificación del script-src. Es requerido que el worker-src sea establecido como blob para el reproductor de vídeo

*Credits: N/A

CVSS Scores

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

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

High

Availability

Low

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

2021-08-16 CVE Reserved
2021-12-14 CVE Published
2024-08-04 CVE Updated
2024-08-04 First Exploit
2024-08-29 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

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

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC
https://github.com/owncast/owncast/security/advisories/GHSA-2hfj-cxw7-g45p	2024-08-04

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Owncast Project Search vendor "Owncast Project"		Owncast Search vendor "Owncast Project" for product "Owncast"				< 0.0.9 Search vendor "Owncast Project" for product "Owncast" and version " < 0.0.9"		-		Affected