QID 980380

QID 980380: Nodejs (npm) Security Update for matrix-js-sdk (GHSA-23cm-x6j7-6hq3)

Security update has been released for matrix-js-sdk to fix the vulnerability.

Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

A logic error in the room key sharing functionality of matrix-js-sdk before 12.4.1 allows a malicious Matrix homeserver participating in an encrypted room to steal room encryption keys from affected Matrix clients participating in that room. This allows the homeserver to decrypt end-to-end encrypted messages sent by affected clients.

Or anyone with access to the account of the original recipient of an encrypted message.

Known clients affected (via their use of vulnerable versions of matrix-js-sdk):

- Element Web (1.8.2 and earlier)
- Element Desktop (1.8.2 and earlier)
- SchildiChat Web (1.7.32-sc1 and earlier)
- SchildiChat Desktop (1.7.32-sc1 and earlier)
- Cinny (1.2.0 and earlier)

  • CVSS V3 rated as Medium - 5.9 severity.
  • CVSS V2 rated as Medium - 4.3 severity.
    • Solution
    Customers are advised to refer to GHSA-23cm-x6j7-6hq3 for updates pertaining to this vulnerability.Workaround:
    To prevent a homeserver from being able to steal the room keys, vulnerable clients can be taken offline or signed out. If signing out, care should be taken to either set up Secure Backup or export E2E room keys in order to preserve access to past messages.
    Vendor References

    CVEs related to QID 980380

    CVE-2021-40823 |
    Software Advisories
    Advisory ID Software Component Link
    GHSA-23cm-x6j7-6hq3 matrix-js-sdk URL Logo github.com/advisories/GHSA-23cm-x6j7-6hq3
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