CVE-2022-39250
Vulnerability from cvelistv5
Published
2022-09-29 00:00
Modified
2024-08-03 12:00
Severity ?
8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Summary
Matrix JavaScript SDK is the Matrix Client-Server software development kit (SDK) for JavaScript. Prior to version 19.7.0, an attacker cooperating with a malicious homeserver could interfere with the verification flow between two users, injecting its own cross-signing user identity in place of one of the users’ identities. This would lead to the other device trusting/verifying the user identity under the control of the homeserver instead of the intended one. The vulnerability is a bug in the matrix-js-sdk, caused by checking and signing user identities and devices in two separate steps, and inadequately fixing the keys to be signed between those steps. Even though the attack is partly made possible due to the design decision of treating cross-signing user identities as Matrix devices on the server side (with their device ID set to the public part of the user identity key), no other examined implementations were vulnerable. Starting with version 19.7.0, the matrix-js-sdk has been modified to double check that the key signed is the one that was verified instead of just referencing the key by ID. An additional check has been made to report an error when one of the device ID matches a cross-signing key. As this attack requires coordination between a malicious homeserver and an attacker, those who trust their homeservers do not need a particular workaround.
References
security-advisories@github.comhttps://github.com/matrix-org/matrix-js-sdk/commit/a587d7c36026fe1fcf93dfff63588abee359be76Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/matrix-org/matrix-js-sdk/releases/tag/v19.7.0Release Notes, Third Party Advisory
security-advisories@github.comhttps://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-5w8r-8pgj-5jmfThird Party Advisory
security-advisories@github.comhttps://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clientsVendor Advisory
security-advisories@github.comhttps://security.gentoo.org/glsa/202210-35Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-js-sdk/commit/a587d7c36026fe1fcf93dfff63588abee359be76Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-js-sdk/releases/tag/v19.7.0Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-5w8r-8pgj-5jmfThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clientsVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202210-35Third Party Advisory
Impacted products
Vendor Product Version
Show details on NVD website

To clipboard 

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}


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