{"id":112410,"date":"2023-12-22T03:10:14","date_gmt":"2023-12-22T01:10:16","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/smtp-smuggling-novaya-tehnika-spufinga-pochtovyh-soobshhenij"},"modified":"2023-12-22T03:10:14","modified_gmt":"2023-12-22T01:10:16","slug":"smtp-smuggling-novaya-tehnika-spufinga-pochtovyh-soobshhenij","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/smtp-smuggling-novaya-tehnika-spufinga-pochtovyh-soobshhenij","title":{"rendered":"SMTP Smuggling \u2014 uus tehnika e-kirjade spoofimiseks","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>SEC Consulti teadlased avaldasid uue sp\u00e4mmi tehnikat, mis on p\u00f5hjustatud erinevate SMTP protokolli rakenduste spetsifikatsioonist k\u00f5rvalekaldumisest. Pakutud r\u00fcnnakutehnika v\u00f5imaldab jagada \u00fche s\u00f5numi mitmeks erinevaks s\u00f5numiks, kui see edastatakse algselt SMTP serverilt teisele SMTP serverile, mis t\u00f5lgendab s\u00f5numi jagamise j\u00e4rjestust erinevalt, kui neid edastatakse \u00fche \u00fchenduse kaudu. Meetodit saab kasutada vale s\u00f5numite saatmiseks teiste saatjate nimel postiteenustes, mis kinnitavad algset saatjat.      <\/p>\n<p>Probleem tuleneb sellest, et erinevad SMTP-serverid t\u00f5lgendavad andmeedastuse l\u00f5pusignaali erinevalt, mis v\u00f5ib viia \u00fche kirja jaotamiseni mitmeks SMTP-serveri seansi k\u00e4igus. Kirja edastamise l\u00f5petamise t\u00e4histamiseks on spetsifikatsioonis m\u00e4\u00e4ratletud j\u00e4rjestus &#171;\r\n.\r\n&#187; (punkt, mida \u00fcmbritsevad ristekraani ja rea vahetuse s\u00fcmbolid). Sellele j\u00e4rjestusele v\u00f5ivad j\u00e4rgneda k\u00e4sklused teise kirja edastamiseks, ilma et \u00fchendust katkestataks. M\u00f5ned SMTP-serverid j\u00e4rgivad rangelt n\u00f5udeid, kuid teised, et tagada \u00fchilduvus haruldaste meiliklientidega, k\u00e4sitlevad eraldajatena ka selliseid j\u00e4rjestusi nagu &#171;\n.\n&#187;, &#171;\n.\r\n&#187;, &#171;\r\n.\n&#187;, &#171;\r.\r&#187;, &#171;\r\n0.\r\n&#187; ja &#171;\r\n0.\r\n&#187;.       <\/p>\n<p>R\u00fcnnak seisneb selles, et esimesele <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/server\/\"   title=\"server\" data-wpil-keyword-link=\"linked\">server<\/a>, mis k\u00e4sitleb ainult eraldajat &#171;\r\n.\r\n&#187;, saadetakse kiri, mille kehas on alternatiivne eraldaja, n\u00e4iteks &#171;\r.\r&#187;, millele j\u00e4rgneb teise s\u00f5numi saatmise k\u00e4sk. Kuna esimene server j\u00e4rgib rangelt spetsifikatsiooni, k\u00e4sitleb ta saadud j\u00e4rjestust kui \u00fchte kirja. Kui kiri suunatakse edastusserverisse v\u00f5i vastuv\u00f5tja serverisse, mis t\u00e4iendavalt interpreteerib j\u00e4rjestust &#171;\r.\r&#187; eraldajana, t\u00f6\u00f6deldakse seda kaht eraldi saadetava kirjana (teise kirja v\u00f5ib saata autentimata kasutaja nimel, v\u00e4ites, et see on vastuv\u00f5tja poolt korrektne).        <center><img decoding=\"async\" alt=\"SMTP Smuggling - uus tehnik spam-meilide petmiseks\" src=\"\/wp-content\/uploads\/2023\/12\/d25550a1e74dd7661328771ac417cf0a.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <center><img decoding=\"async\" alt=\"SMTP Smuggling - uus tehnik spam-meilide petmiseks\" src=\"\/wp-content\/uploads\/2023\/12\/a2e617933f361c03cef3c40350157f4c.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>Alternatiivsete eraldajate toetavate SMTP-serverite ja teenuste n\u00e4idete hulka kuuluvad Postfix, Sendmail, MS Exchange Online ja Cisco Secure Email Gateway. E-kirjade teenuste seast, mis ei filtreeri eba\u00f5igeid eraldajaid, nagu \u00fchendustest teiste serveritega - GMX, iCloud ja Microsoft Outlook.      <\/p>\n<p>Probleemi blokeerimiseks on Postfixi versioonides 3.8.1, 3.7.6, 3.6.10 ja 3.5.20 lisatud seadistus &#171;smtpd_forbid_unauth_pipelining&#187;, mis katkestab \u00fchenduse, kui kasutatakse eraldajaid, mis ei vasta RFC 2920 ja RFC 5321 n\u00f5uetele. Praegu on see seadistus vaikimisi v\u00e4lja l\u00fclitatud, kuid plaanitakse see vaikimisi aktiveerida Postfixi 3.9 haru toetamisel, mis on oodatud 2024. aasta kevadel. Harus 3.9 lisatakse ka seadistus smtpd_forbid_bare_newline, mis annab vea, kui kasutatakse ainult rea vahetuse s\u00fcmbolit (&#171;\n&#187;) ridade eraldamiseks, mis rikub RFC 5321.     <\/p>\n<p>Valmivas Sendmail 8.18.0.2 versioonis on kavandatud kaitse r\u00fcnnaku eest srv_features'is, pakkudes v\u00f5imalust &#8216;o&#8217;, mis aktsepteerib ainult j\u00e4rjestust &#171;\r\n.\r\n&#187;. Toodud on t\u00e4helepanek, et alternatiivsete eraldajate toe keelamine v\u00f5ib katkestada haruldaste meiliklientide funktsiooni, mis ei vasta t\u00e4ielikult SMTP spetsifikatsioonile.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60329\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 SEC Consult \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0438 \u043d\u043e\u0432\u0443\u044e \u0442\u0435\u0445\u043d\u0438\u043a\u0443 \u0441\u043f\u0443\u0444\u0438\u043d\u0433\u0430, \u0432\u044b\u0437\u0432\u0430\u043d\u043d\u0443\u044e \u0440\u0430\u0441\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u044f\u043c\u0438 \u0432 \u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u0438 \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0432 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f\u0445 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 SMTP. \u041f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u0430\u044f \u0442\u0435\u0445\u043d\u0438\u043a\u0430 \u0430\u0442\u0430\u043a\u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0440\u0430\u0441\u0449\u0435\u043f\u0438\u0442\u044c \u043e\u0434\u043d\u043e \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0435 \u043d\u0430 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0440\u0430\u0437\u043d\u044b\u0445 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0439 \u043f\u0440\u0438 \u0435\u0433\u043e \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0435 \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u043c SMTP-\u0441\u0435\u0440\u0432\u0435\u0440\u043e\u043c \u043d\u0430 \u0434\u0440\u0443\u0433\u043e\u0439 SMTP-\u0441\u0435\u0440\u0432\u0435\u0440, \u043f\u043e \u0438\u043d\u043e\u043c\u0443 \u0442\u0440\u0430\u043a\u0442\u0443\u044e\u0449\u0438\u0439 \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0434\u043b\u044f \u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u043f\u0438\u0441\u0435\u043c, \u043f\u0435\u0440\u0435\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0445 \u0447\u0435\u0440\u0435\u0437 \u043e\u0434\u043d\u043e \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435. \u041c\u0435\u0442\u043e\u0434 \u043c\u043e\u0436\u0435\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0438 \u0444\u0438\u043a\u0442\u0438\u0432\u043d\u044b\u0445 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