#VU67742 Insufficient verification of data authenticity in Matrix Javascript SDK - CVE-2022-39249

Vulnerability identifier: #VU67742

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-39249

CWE-ID: CWE-345

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Matrix Javascript SDK
Web applications / JS libraries

Vendor: Matrix.org

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to a very permissive key forwarding strategy. A remote attacker cooperating with a malicious home server can construct messages appearing to have come from another person.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Matrix Javascript SDK: 0.1.0 - 19.6.0

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External links
https://github.com/matrix-org/matrix-js-sdk/commit/a587d7c36026fe1fcf93dfff63588abee359be76
https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6263-x97c-c4gg
https://github.com/matrix-org/matrix-js-sdk/releases/tag/v19.7.0
https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients
https://github.com/matrix-org/matrix-spec-proposals/pull/3061

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.