CVE-2021-40823

Published on: 09/13/2021 12:00:00 AM UTC

Last Modified on: 09/24/2021 05:27:00 PM UTC

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Certain versions of Javascript Sdk from Matrix contain the following vulnerability:

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.

  • CVE-2021-40823 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as MEDIUM severity.

CVSS3 Score: 5.9 - MEDIUM

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
NETWORK HIGH NONE NONE
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
UNCHANGED HIGH NONE NONE

CVSS2 Score: 4.3 - MEDIUM

Access
Vector
Access
Complexity
Authentication
NETWORK MEDIUM NONE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
PARTIAL NONE NONE

CVE References

Description Tags Link
Disclosing CVE-2021-40823 and CVE-2021-40824: E2EE vulnerability in multiple Matrix clients | Matrix.org matrix.org
text/html
URL Logo MISC matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing
Release v12.4.1 · matrix-org/matrix-js-sdk · GitHub github.com
text/html
URL Logo MISC github.com/matrix-org/matrix-js-sdk/releases/tag/v12.4.1

Related QID Numbers

  • 690038 Free Berkeley Software Distribution (FreeBSD) Security Update for matrix clients (93eb0e48-14ba-11ec-875e-901b0e9408dc)

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
ApplicationMatrixJavascript SdkAllAllAllAll
  • cpe:2.3:a:matrix:javascript_sdk:*:*:*:*:*:*:*:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @Sami_Lehtinen Disclosing CVE-2021-40823 and CVE-2021-40824: E2EE vulnerability in multiple Matrix clients matrix.org/blog/2021/09/1…twitter.com/i/web/status/1… 2021-09-13 15:46:19
Twitter Icon @_Spacegeek "Disclosing CVE-2021-40823 and CVE-2021-40824: E2EE vulnerability in multiple Matrix clients" matrix.org/blog/2021/09/1… #Matrix 2021-09-13 16:08:05
Twitter Icon @campuscodi Disclosing CVE-2021-40823 and CVE-2021-40824: E2EE vulnerability in multiple Matrix clients matrix.org/blog/2021/09/1… https://t.co/OdOS9yxtnM 2021-09-13 17:28:03
Twitter Icon @CVEreport CVE-2021-40823 : A logic error in the room key sharing functionality of matrix-js-sdk aka Matrix Javascript SDK b… twitter.com/i/web/status/1… 2021-09-13 19:07:44
Twitter Icon @schestowitz Disclosing CVE-2021-40823 and CVE-2021-40824: E2EE vulnerability in multiple Matrix clients… twitter.com/i/web/status/1… 2021-09-13 20:42:37
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