#VU98728 Missing Authorization in Matrix Javascript SDK - CVE-2024-47080

Vulnerability identifier: #VU98728

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-47080

CWE-ID: CWE-862

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 gain access to sensitive information.

The vulnerability exists due to the way the MatrixClient.sendSharedHistoryKeys method shares historical message keys with newly invited users. A remote attacker can inject their own devices to receive sensitive historical keys and access past messages in the room without proper security checks.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Matrix Javascript SDK: 9.11.0 - 34.7.0

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External links
https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-4jf8-g8wp-cx7c
https://github.com/matrix-org/matrix-spec-proposals/pull/3061
https://github.com/matrix-org/matrix-js-sdk/commit/2fb1e659c81f75253c047832dc9dcc2beddfac5f

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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