{"id":95368,"date":"2020-09-28T13:42:14","date_gmt":"2020-09-28T11:42:14","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-openssh-8-4"},"modified":"2020-09-28T13:42:14","modified_gmt":"2020-09-28T11:42:14","slug":"reliz-openssh-8-4","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/news\/reliz-openssh-8-4","title":{"rendered":"OpenSSH 8.4 release","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>After four months of development <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.mindrot.org\/pipermail\/openssh-unix-dev\/2020-September\/038826.html\">introduced<\/a><\/noindex> Release of OpenSSH 8.4, the open-source implementation of the client and server for working with SSH 2.0 and SFTP protocols.<\/p>\n<p>Key Changes:<\/p>\n<ul>\n<li class=\"l\"> Security-related changes:\n<ul>\n<li class=\"l\"> In the ssh-agent, when using FIDO keys not created for SSH authentication (the key identifier does not start with the string 'ssh:'), there is now a check ensuring that the message will be signed using methods applied within the SSH protocol. This change will prevent redirecting the ssh-agent to remote hosts with FIDO keys, blocking the use of those keys for generating signatures for web authentication requests (the reverse scenario, where a browser can sign an SSH request, is already excluded thanks to the 'ssh:' prefix in the key identifier).\n<li class=\"l\"> In ssh-keygen, support for the credProtect extension described in the FIDO 2.1 specification has been added when generating resident keys, providing additional protection for keys through a mandatory PIN input request before executing any operation that could lead to extracting the resident key from the token.\n<\/ul>\n<li class=\"l\"> Changes that may break compatibility:\n<ul>\n<li class=\"l\"> For FIDO\/U2F support, it is recommended to use the libfido2 library version 1.5.0 or higher. Partial support for older releases is implemented, but in this case, features such as resident keys, PIN requests, and connecting multiple tokens will be unavailable.\n<li class=\"l\"> In ssh-keygen, the format of the attestation information, optionally saved during the generation of a FIDO key, has been updated to include data for the authenticator that is necessary for verifying attestation digital signatures.\n<li class=\"l\"> The API used for OpenSSH interaction with the middleware for accessing FIDO tokens has been changed.\n<li class=\"l\"> When building the portable version of OpenSSH, automake is now required to generate the configure script and associated build files (if the build is performed from a released tar file with the code, re-generating configure is not necessary).\n<\/ul>\n<li class=\"l\"> Support for FIDO keys requiring a PIN confirmation has been added in ssh and ssh-keygen. An option 'verify-required' has been added in ssh-keygen for generating keys with PIN. When using such keys, the user is prompted to confirm their actions by entering the PIN before performing the signature creation operation.\n<li class=\"l\"> In sshd, the 'verify-required' option has been implemented in the authorized_keys configuration, requiring the use of user presence verification during token operations. The FIDO standard provides several options for such verification, but currently, OpenSSH only supports PIN-based verification.\n<li class=\"l\"> Support for verifying digital signatures compliant with the FIDO Webauthn standard has been added in sshd and ssh-keygen, allowing the use of FIDO keys in web browsers.\n<li class=\"l\"> In ssh, in the CertificateFile settings,<br \/>\n   ControlPath, IdentityAgent, IdentityFile, LocalForward, and<br \/>\n   RemoteForward allows the substitution of values from environment variables specified in the format '${ENV}'. <\/p>\n<li class=\"l\"> In ssh and ssh-agent, support for the $SSH_ASKPASS_REQUIRE environment variable has been added, which can be used to enable or disable the calling of ssh-askpass.\n<li class=\"l\"> In ssh, the ssh_config directive AddKeysToAgent now includes the ability to limit the key's validity period. After the specified limit is reached, keys are automatically removed from the ssh-agent.\n<li class=\"l\"> In scp and sftp, the '-A' flag now explicitly allows forwarding in scp and sftp using ssh-agent (by default, forwarding is disabled).\n<li class=\"l\"> Support for the substitution '%k', which defines the hostname key name, has been added in ssh settings. This feature can be used to separate keys into individual files (for example, 'UserKnownHostsFile ~\/.ssh\/known_hosts.d\/%k').\n<li class=\"l\"> The operation 'ssh-add -d -' is allowed to read keys that are to be deleted from stdin.\n<li class=\"l\"> In sshd, logging of the start and end of the connection trimming process, regulated by the MaxStartups parameter, has been implemented.\n<\/ul>\n<p>OpenSSH developers also reminded about the imminent deprecation of algorithms using SHA-1 hashes due to <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52149\">increased<\/a><\/noindex> the effectiveness of collision attacks with a given prefix (the cost of finding a collision is estimated at about $45,000). In one of the upcoming releases, the ability to use the \u2018ssh-rsa\u2019 public key signature algorithm, which is mentioned in the original RFC for the SSH protocol and remains widely used in practice, will be disabled by default (to check for the usage of ssh-rsa in your systems, you can try to connect via ssh with the option \u2018-oHostKeyAlgorithms=-ssh-rsa\u2019).<\/p>\n<p>To smooth the transition to new algorithms, the next OpenSSH release will have the UpdateHostKeys setting enabled by default, which will automatically migrate clients to more secure algorithms. Recommended migration algorithms include rsa-sha2-256\/512 based on RFC8332 RSA SHA-2 (supported since OpenSSH 7.2 and used by default), ssh-ed25519 (supported since OpenSSH 6.5), and ecdsa-sha2-nistp256\/384\/521 based on RFC5656 ECDSA (supported since OpenSSH 5.7). <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Source: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=53793\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u0447\u0435\u0442\u044b\u0440\u0451\u0445 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 8.4, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430\u043c SSH 2.0 \u0438 SFTP. \u041e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f: \u0418\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0435 \u0441 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u044c\u044e: \u0412 ssh-agent \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u043a\u043b\u044e\u0447\u0435\u0439 FIDO, \u0441\u043e\u0437\u0434\u0430\u043d\u043d\u044b\u0445 \u043d\u0435 \u0434\u043b\u044f \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0447\u0435\u0440\u0435\u0437 SSH (\u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440 \u043a\u043b\u044e\u0447\u0430 \u043d\u0430\u0447\u0438\u043d\u0430\u0435\u0442\u0441\u044f \u043d\u0435 \u0441\u043e \u0441\u0442\u0440\u043e\u043a\u0438 &#171;ssh:&#187;), \u0442\u0435\u043f\u0435\u0440\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0430, \u0447\u0442\u043e \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0435 \u0431\u0443\u0434\u0435\u0442 \u043f\u043e\u0434\u043f\u0438\u0441\u0430\u043d\u043e \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-95368","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u043e\u0441\u043b\u0435 \u0447\u0435\u0442\u044b\u0440\u0451\u0445 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 8.4, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" 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