{"id":24076,"date":"2024-02-19T09:24:13","date_gmt":"2024-02-19T00:24:13","guid":{"rendered":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=24076"},"modified":"2024-02-19T09:24:13","modified_gmt":"2024-02-19T00:24:13","slug":"mta%e3%81%b8%e3%81%ae%e6%bf%80%e3%81%97%e3%81%84%e6%94%bb%e6%92%83","status":"publish","type":"post","link":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=24076","title":{"rendered":"MTA\u3078\u306e\u6fc0\u3057\u3044\u653b\u6483"},"content":{"rendered":"\n

2024年2月15日(木)あたりから，管理しているサーバーへMTAの認証を求める “攻撃” が続いています．攻めてきたIPアドレスをiptablesに登録してアクセスできないようにしていますが，次から次へと新しいIPアドレスを使って攻めてきます．今回の攻撃だけですでに1000近い数のIPアドレスが使われています．<\/p>\n\n\n\n

同種の攻撃はこれまでもさんざんありました．目的はSPAMやPhishing, 脅迫などの犯罪行為のメールを拡散するための踏み台にすることだと思います．<\/p>\n\n\n\n

実害はほとんどない1<\/a><\/sup>ネットの若干のバンド幅，サーバーのCPU使用，ログファイルのためのデータ領域とiptablesのための主記憶等の占有が実害といえば実害です．<\/span>し，認証を破られることもないとは思いますが，気持ち悪いのでしばらくはいつも以上に気をつけてみていこうと思います．<\/p>\n","protected":false},"excerpt":{"rendered":"

2024\u5e742\u670815\u65e5(\u6728)\u3042\u305f\u308a\u304b\u3089\uff0c\u7ba1\u7406\u3057\u3066\u3044\u308b\u30b5\u30fc\u30d0\u30fc\u3078MTA\u306e\u8a8d\u8a3c\u3092\u6c42\u3081\u308b “\u653b\u6483” \u304c\u7d9a\u3044\u3066\u3044\u307e\u3059\uff0e\u653b\u3081\u3066\u304d\u305fIP\u30a2\u30c9\u30ec\u30b9\u3092iptables\u306b\u767b\u9332\u3057\u3066\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u304c\uff0c\u6b21\u304b\u3089\u6b21\u3078\u3068\u65b0\u3057\u3044IP\u30a2\u30c9\u30ec\u30b9\u3092\u4f7f\u3063\u3066\u653b\u3081\u3066\u304d\u307e\u3059\uff0e\u4eca\u56de\u306e\u653b\u6483\u3060\u3051\u3067\u3059\u3067\u306b1000\u8fd1\u3044\u6570\u306eIP\u30a2\u30c9\u30ec\u30b9\u304c\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\uff0e \u540c\u7a2e\u306e\u653b\u6483\u306f\u3053\u308c\u307e\u3067\u3082\u3055\u3093\u3056\u3093\u3042\u308a\u307e\u3057\u305f\uff0e\u76ee\u7684\u306fSPAM\u3084Phishing, \u8105\u8feb\u306a\u3069\u306e\u72af\u7f6a\u884c\u70ba\u306e\u30e1\u30fc\u30eb\u3092\u62e1\u6563\u3059\u308b\u305f\u3081\u306e\u8e0f\u307f\u53f0\u306b\u3059\u308b\u3053\u3068\u3060\u3068\u601d\u3044\u307e\u3059\uff0e \u5b9f\u5bb3\u306f\u307b\u3068\u3093\u3069\u306a\u3044\u3057\uff0c\u8a8d\u8a3c\u3092\u7834\u3089\u308c\u308b\u3053\u3068\u3082\u306a\u3044\u3068\u306f\u601d\u3044\u307e\u3059\u304c\uff0c\u6c17\u6301\u3061\u60aa\u3044\u306e\u3067\u3057\u3070\u3089\u304f\u306f\u3044\u3064\u3082\u4ee5\u4e0a\u306b\u6c17\u3092\u3064\u3051\u3066\u307f\u3066\u3044\u3053\u3046\u3068\u601d\u3044\u307e\u3059\uff0e<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_daextam_enable_autolinks":"","footnotes":""},"categories":[3,28],"tags":[],"class_list":["post-24076","post","type-post","status-publish","format-standard","hentry","category-computer","category-security"],"publishpress_future_action":{"enabled":false,"date":"2026-05-22 00:20:27","action":"change-status","newStatus":"draft","terms":[],"taxonomy":"category","extraData":[]},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/posts\/24076","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=24076"}],"version-history":[{"count":0,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/posts\/24076\/revisions"}],"wp:attachment":[{"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=24076"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24076"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24076"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}