{"action":"opened","issue":{"url":"https://api.github.com/repos/randombit/botan/issues/496","repository_url":"https://api.github.com/repos/randombit/botan","labels_url":"https://api.github.com/repos/randombit/botan/issues/496/labels{/name}","comments_url":"https://api.github.com/repos/randombit/botan/issues/496/comments","events_url":"https://api.github.com/repos/randombit/botan/issues/496/events","html_url":"https://github.com/randombit/botan/issues/496","id":156060957,"number":496,"title":"TLS1.2 cipher suites accepted in TLS 1.0 / 1.1 connections","user":{"login":"jurajsomorovsky","id":6516684,"avatar_url":"https://avatars.githubusercontent.com/u/6516684?v=3","gravatar_id":"","url":"https://api.github.com/users/jurajsomorovsky","html_url":"https://github.com/jurajsomorovsky","followers_url":"https://api.github.com/users/jurajsomorovsky/followers","following_url":"https://api.github.com/users/jurajsomorovsky/following{/other_user}","gists_url":"https://api.github.com/users/jurajsomorovsky/gists{/gist_id}","starred_url":"https://api.github.com/users/jurajsomorovsky/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jurajsomorovsky/subscriptions","organizations_url":"https://api.github.com/users/jurajsomorovsky/orgs","repos_url":"https://api.github.com/users/jurajsomorovsky/repos","events_url":"https://api.github.com/users/jurajsomorovsky/events{/privacy}","received_events_url":"https://api.github.com/users/jurajsomorovsky/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2016-05-20T22:16:32Z","updated_at":"2016-05-20T22:16:32Z","closed_at":null,"body":"It is possible to establish TLS 1.0 / 1.1 connections with cipher suites that are only standardized for TLS 1.2. Examples give the following ones:\r\n\r\n TLS_RSA_WITH_AES_256_CBC_SHA256\r\n TLS_DHE_RSA_WITH_AES_256_CBC_SHA256\r\n TLS_DHE_RSA_WITH_AES_128_CBC_SHA256\r\n TLS_RSA_WITH_AES_128_CBC_SHA256\r\n\r\nThis is not a direct security critical issue. However, using these secure cipher suites in older protocols could possibly undermine their security. There should be a clear separation of which protocols support which cipher suites.\r\n\r\nFound with TLS-Attacker: https://github.com/RUB-NDS/TLS-Attacker\r\nVerification possible e.g. with:\r\n`java -jar TLS-Attacker-1.0.jar client -cipher TLS_RSA_WITH_AES_128_CBC_SHA256 -version TLS10`"}}
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