After six months of development, the release of OpenSSH 8.9, an open implementation of the client and server for SSH 2.0 and SFTP protocols, has been made available. In this new version, a vulnerability in sshd that could potentially allow access without authentication has been fixed. The problem was caused by an integer overflow in the authentication code, but exploitation is only feasible in conjunction with other logical errors in the code. <\/p>\n
In its current state, the vulnerability is not exploitable when privilege separation mode is enabled, as its manifestation is blocked by specific checks performed in the privilege separation tracking code. Privilege separation mode has been enabled by default since 2002, starting with OpenSSH 3.2.2, and is mandatory since the release of OpenSSH 7.5, published in 2017. Furthermore, in portable versions of OpenSSH starting from the 6.5 release (2014), the vulnerability is mitigated by compiling with integer overflow protection flags. <\/p>\n
Other changes: <\/p>\n
In one of the following releases, it is planned to change the default utility scp to use SFTP instead of the deprecated SCP\/RCP protocol. SFTP employs more predictable methods for handling names and does not use shell-based glob pattern processing of file names on the other host, which creates security issues. Specifically, with SCP and RCP, the server decides which files and directories to send to the client, while the client only verifies the correctness of the returned object names, which, in the absence of proper checks on the client side, allows for the transfer of other file names that differ from the requested ones. server<\/a> to pass other filenames that differ from the requested ones. The SFTP protocol lacks the mentioned issues but does not support path expansion, such as '~\/'. 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\u0441 \u0434\u0440\u0443\u0433\u0438\u043c\u0438 \u043b\u043e\u0433\u0438\u0447\u0435\u0441\u043a\u0438\u043c\u0438 \u043e\u0448\u0438\u0431\u043a\u0430\u043c\u0438 \u0432 \u043a\u043e\u0434\u0435. \u0412 \u0442\u0435\u043a\u0443\u0449\u0435\u043c […]<\/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-103424","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Release of OpenSSH 8.9 with vulnerability fix in sshd | ProHoster","description":"After six months of development, the release of OpenSSH 8.9 is presented, the open implementation 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Source: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"