{"containers": {"cna": {"affected": [{"product": "matrix-ios-sdk", "vendor": "matrix-org", "versions": [{"status": "affected", "version": "< 0.23.19"}]}], "descriptions": [{"lang": "en", "value": "Matrix iOS SDK allows developers to build iOS apps compatible with Matrix. Prior to version 0.23.19, 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-ios-sdk implementing a too permissive key forwarding strategy. The default policy for accepting key forwards has been made more strict in the matrix-ios-sdk version 0.23.19. matrix-ios-sdk will now only accept forwarded keys in response to previously issued requests and only from own, verified devices. 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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:matrix:software_development_kit:*:*:*:*:*:iphone_os:*:*", "matchCriteriaId": "D8936990-DFEF-443C-B860-E38726590804", "versionEndExcluding": "0.23.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Matrix iOS SDK allows developers to build iOS apps compatible with Matrix. Prior to version 0.23.19, 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-ios-sdk implementing a too permissive key forwarding strategy. 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Los clientes deben asegurarse de que los mensajes descifrados con una clave con \"trusted = false\" sean decorados apropiadamente (por ejemplo, mostrando una advertencia para tales mensajes). 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