CVE-2021-40823

Severity Score

5.9

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK) before 12.4.1 allows a malicious Matrix homeserver present in an encrypted room to steal room encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the homeserver to decrypt end-to-end encrypted messages sent by affected clients.

Un error lógico en la funcionalidad de compartición de claves de sala de matrix-js-sdk (también conocido como Matrix Javascript SDK) antes de la versión 12.4.1 permite que un servidor doméstico de Matrix malicioso presente en una sala cifrada robe las claves de cifrado de la sala (a través de mensajes de protocolo de Matrix manipulados) que fueron enviados originalmente por los clientes de Matrix afectados que participan en esa sala. Esto permite al servidor doméstico descifrar los mensajes cifrados de extremo a extremo enviados por los clientes afectados.e dispositivo

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-09-09 CVE Reserved
2021-09-13 CVE Published
2024-05-29 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-290: Authentication Bypass by Spoofing

CAPEC

References (2)

URL	Tag	Source
https://github.com/matrix-org/matrix-js-sdk/releases/tag/v12.4.1	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing	2023-08-08

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Matrix Search vendor "Matrix"		Javascript Sdk Search vendor "Matrix" for product "Javascript Sdk"				< 12.4.1 Search vendor "Matrix" for product "Javascript Sdk" and version " < 12.4.1"		-		Affected