In fail2ban 0.10.5 through 1.1.1 before ddd879d, the sshd filter (config\/filter.d\/sshd.conf) accepts an “on ” suffix after the host address. Because OpenSSH logs the offered username verbatim, a remote unauthenticated attacker can use a username such as “x VICTIM-SOURCE-IP-ADDRESS on” to make fail2ban associate failed login attempts with an arbitrary source IP address and ban it (e.g., to block logins from a legitimate user). The default filter mode is affected.<\/p>\n","protected":false},"excerpt":{"rendered":"
In fail2ban 0.10.5 through 1.1.1 before ddd879d, the sshd filter (config\/filter.d\/sshd.conf) accepts an “on ” suffix after the host address. Because OpenSSH logs the offered username verbatim, a remot<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-36617","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/36617","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=36617"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=36617"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=36617"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}