CVE - CVE-2022-39249

CVE-ID
CVE-2022-39249	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
Matrix Javascript SDK is the Matrix Client-Server SDK for JavaScript. Prior to version 19.7.0, an attacker cooperating with a malicious homeserver can construct messages appearing to have come from another person. Such messages will be marked with a grey shield on some platforms, but this may be missing in others. This attack is possible due to the matrix-js-sdk implementing a too permissive key forwarding strategy on the receiving end. Starting with version 19.7.0, the default policy for accepting key forwards has been made more strict in the matrix-js-sdk. matrix-js-sdk will now only accept forwarded keys in response to previously issued requests and only from own, verified devices. The SDK now sets a `trusted` flag on the decrypted message upon decryption, based on whether the key used to decrypt the message was received from a trusted source. Clients need to ensure that messages decrypted with a key with `trusted = false` are decorated appropriately, for example, by showing a warning for such messages. This attack requires coordination between a malicious homeserver and an attacker, and those who trust your homeservers do not need a workaround.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
CONFIRM:https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6263-x97c-c4gg URL:https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6263-x97c-c4gg GENTOO:GLSA-202210-35 URL:https://security.gentoo.org/glsa/202210-35 MISC:https://github.com/matrix-org/matrix-js-sdk/commit/a587d7c36026fe1fcf93dfff63588abee359be76 URL:https://github.com/matrix-org/matrix-js-sdk/commit/a587d7c36026fe1fcf93dfff63588abee359be76 MISC:https://github.com/matrix-org/matrix-js-sdk/releases/tag/v19.7.0 URL:https://github.com/matrix-org/matrix-js-sdk/releases/tag/v19.7.0 MISC:https://github.com/matrix-org/matrix-spec-proposals/pull/3061 URL:https://github.com/matrix-org/matrix-spec-proposals/pull/3061 MISC:https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients URL:https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients
Assigning CNA
GitHub (maintainer security advisories)
Date Record Created
20220902	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20220902)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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