{"id":33247,"date":"2019-10-31T21:51:34","date_gmt":"2019-10-31T18:51:34","guid":{"rendered":"https:\/\/prohoster.info\/blog\/reliz-wordpress-5-2-s-podderzhkoj-proverki-obnovlenij-po-tsifrovoj-podpisi\/"},"modified":"2019-10-31T21:51:34","modified_gmt":"2019-10-31T18:51:34","slug":"reliz-wordpress-5-2-s-podderzhkoj-proverki-obnovlenij-po-tsifrovoj-podpisi","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/reliz-wordpress-5-2-s-podderzhkoj-proverki-obnovlenij-po-tsifrovoj-podpisi","title":{"rendered":"A WordPress 5.2 megjelen\u00e9se digit\u00e1lis al\u00e1\u00edr\u00e1s alapj\u00e1n t\u00f6rt\u00e9n\u0151 friss\u00edt\u00e9si ellen\u0151rz\u00e9s t\u00e1mogat\u00e1s\u00e1val","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/wordpress.org\/news\/2019\/05\/jaco\/\">Bemutatva<\/a><\/noindex> webtartalom-kezel\u0151 rendszer megjelen\u00e9se <noindex><a rel=\"nofollow\" href=\"https:\/\/wordpress.org\/\">WordPress 5.2<\/a><\/noindex>. A kiad\u00e1s jelent\u0151s a <noindex><a rel=\"nofollow\" href=\"https:\/\/core.trac.wordpress.org\/ticket\/25052\">hat \u00e9ves epiz\u00f3d befejez\u00e9sek\u00e9nt<\/a><\/noindex> a <noindex><a rel=\"nofollow\" href=\"https:\/\/paragonie.com\/blog\/2019\/05\/wordpress-5-2-mitigating-supply-chain-attacks-against-33-internet\">lehet\u0151s\u00e9gek<\/a><\/noindex> digit\u00e1lis al\u00e1\u00edr\u00e1s alapj\u00e1n t\u00f6rt\u00e9n\u0151 friss\u00edt\u00e9sek \u00e9s b\u0151v\u00edtm\u00e9nyek ellen\u0151rz\u00e9s\u00e9nek megval\u00f3s\u00edt\u00e1sa. <\/p>\n<p>Eddig a WordPress friss\u00edt\u00e9sek telep\u00edt\u00e9sekor a biztons\u00e1g f\u0151 t\u00e9nyez\u0151je a WordPress infrastrukt\u00far\u00e1j\u00e1ban \u00e9s szervereiben val\u00f3 bizalom volt (a let\u00f6lt\u00e9s ut\u00e1n a hash-ellen\u0151rz\u00e9s t\u00f6rt\u00e9nt, forr\u00e1s ellen\u0151rz\u00e9se n\u00e9lk\u00fcl). A projekt szervereinek kompromitt\u00e1l\u00e1sa eset\u00e9n a t\u00e1mad\u00f3k lehet\u0151s\u00e9get kaptak arra, hogy hamis\u00edtj\u00e1k a friss\u00edt\u00e9seket, \u00e9s k\u00e1rt\u00e9kony k\u00f3dot terjesztenek a WordPress alap\u00fa webhelyek k\u00f6z\u00f6tt, amelyek automatikus friss\u00edt\u00e9si rendszert haszn\u00e1lnak. A kor\u00e1bban alkalmazott bizalmi modellel t\u00f6rt\u00e9n\u0151 sz\u00e1ll\u00edt\u00e1s eset\u00e9n a felhaszn\u00e1l\u00f3k oldal\u00e1n az ilyen hamis\u00edt\u00e1s \u00e9szrev\u00e9tlen maradt volna. <\/p>\n<p>Figyelembe v\u00e9ve, hogy a <noindex><a rel=\"nofollow\" href=\"https:\/\/w3techs.com\/technologies\/overview\/content_management\/all\">adatok<\/a><\/noindex> w3techs projekten bel\u00fcl a WordPress platformot az interneten tal\u00e1lhat\u00f3 webhelyek 33.8%-a haszn\u00e1lja, az incidens katasztr\u00f3fa m\u00e9reteket \u00f6lthetett volna. Ezen k\u00edv\u00fcl a infrastrukt\u00fara kompromitt\u00e1l\u00f3d\u00e1s\u00e1nak vesz\u00e9lye nem volt hipotetikus, hanem teljesen val\u00f3s\u00e1gos. P\u00e9ld\u00e1ul n\u00e9h\u00e1ny \u00e9vvel ezel\u0151tt egy biztons\u00e1gi kutat\u00f3 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.wordfence.com\/blog\/2016\/11\/hacking-27-web-via-wordpress-auto-update\/\">bemutatta<\/a><\/noindex> a sebezhet\u0151s\u00e9get, amely lehet\u0151v\u00e9 tette a t\u00e1mad\u00f3 sz\u00e1m\u00e1ra, hogy k\u00f3dot hajtson v\u00e9gre a api.wordpress.org szerver oldal\u00e1n. <\/p>\n<p>Digit\u00e1lis al\u00e1\u00edr\u00e1sok alkalmaz\u00e1sa eset\u00e9n a friss\u00edt\u00e9sek terjeszt\u00e9si szerver\u00e9nek ellen\u0151rz\u00e9s\u00e9nek megszerz\u00e9se nem vezetne a felhaszn\u00e1l\u00f3i rendszerek kompromitt\u00e1l\u00e1s\u00e1hoz, mivel a t\u00e1mad\u00e1s v\u00e9grehajt\u00e1s\u00e1hoz k\u00fcl\u00f6n sz\u00fcks\u00e9ges lenne megszerezni a titkos kulcsot, aminek seg\u00edts\u00e9g\u00e9vel a friss\u00edt\u00e9sek al\u00e1\u00edr\u00e1s\u00e1t v\u00e9gzik. <\/p>\n<p>A digit\u00e1lis al\u00e1\u00edr\u00e1s alapj\u00e1n t\u00f6rt\u00e9n\u0151 friss\u00edt\u00e9sek forr\u00e1s\u00e1nak ellen\u0151rz\u00e9s\u00e9nek bevezet\u00e9s\u00e9t akad\u00e1lyozta, hogy a sz\u00fcks\u00e9ges kriptogr\u00e1fiai algoritmusok t\u00e1mogat\u00e1sa a PHP alapkiad\u00e1s\u00e1ban viszonylag nemr\u00e9g jelent meg. A sz\u00fcks\u00e9ges kriptogr\u00e1fiai algoritmusok integr\u00e1l\u00e1s\u00e1val alakultak ki a <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49924\">Libsodium<\/a><\/noindex> a f\u0151 keretbe <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=47652\">PHP 7.2<\/a><\/noindex>. De a WordPress \u00e1ltal minim\u00e1lisan t\u00e1mogatott PHP verzi\u00f3k\u00e9nt <noindex><a rel=\"nofollow\" href=\"https:\/\/wordpress.org\/support\/article\/requirements\/\">az<\/a><\/noindex> 5.2.4 kiad\u00e1s (WordPress 5.2 - 5.6.20-t\u00f3l). A digit\u00e1lis al\u00e1\u00edr\u00e1sok t\u00e1mogat\u00e1s\u00e1nak bevezet\u00e9se jelent\u0151s m\u00e9rt\u00e9kben n\u00f6veln\u00e9 a minim\u00e1lisan t\u00e1mogatott PHP verzi\u00f3val szembeni k\u00f6vetelm\u00e9nyeket, vagy k\u00fcls\u0151 f\u00fcgg\u0151s\u00e9get ig\u00e9nyelne, amit a fejleszt\u0151k nem tudtak v\u00e1llalni a PHP verzi\u00f3k elterjedts\u00e9ge miatt a t\u00e1rhelyszolg\u00e1ltat\u00f3kn\u00e1l. <\/p>\n<p>A megold\u00e1s a <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=45868\">fejleszt\u00e9s volt<\/a><\/noindex> \u00e9s a WordPress 5.2-nek a Libsodium kompakt v\u00e1ltozat\u00e1t is tartalmazza -  <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/paragonie\/sodium_compat\">Sodium Compat<\/a><\/noindex>, amelyben PHP nyelven egy minim\u00e1lis algoritmuscsomag val\u00f3sul meg a digit\u00e1lis al\u00e1\u00edr\u00e1sok ellen\u0151rz\u00e9s\u00e9re. A megval\u00f3s\u00edt\u00e1s teljes\u00edtm\u00e9nye k\u00edv\u00e1nnival\u00f3t hagy maga ut\u00e1n, de teljes m\u00e9rt\u00e9kben megoldja a kompatibilit\u00e1si probl\u00e9m\u00e1t, \u00e9s lehet\u0151v\u00e9 teszi a plugin fejleszt\u0151k sz\u00e1m\u00e1ra a modern kriptogr\u00e1fiai algoritmusok bevezet\u00e9s\u00e9t.<\/p>\n<p>A digit\u00e1lis al\u00e1\u00edr\u00e1sok l\u00e9trehoz\u00e1s\u00e1hoz a k\u00f6vetkez\u0151 algoritmus ker\u00fcl felhaszn\u00e1l\u00e1sra: <noindex><a rel=\"nofollow\" href=\"https:\/\/ed25519.cr.yp.to\/\">Ed25519<\/a><\/noindex>, amelyet Daniel J. Bernstein k\u00f6zrem\u0171k\u00f6d\u00e9s\u00e9vel fejlesztettek ki. A digit\u00e1lis al\u00e1\u00edr\u00e1s a SHA384 hash \u00e9rt\u00e9khez k\u00e9pest keletkezik, amely a friss\u00edt\u00e9si arch\u00edvum tartalm\u00e1b\u00f3l lett kisz\u00e1m\u00edtva. Az Ed25519 magasabb biztons\u00e1gi szinttel rendelkezik, mint az ECDSA \u00e9s a DSA, \u00e9s rendk\u00edv\u00fcl gyorsan k\u00e9pes az al\u00e1\u00edr\u00e1sok ellen\u0151rz\u00e9s\u00e9re \u00e9s l\u00e9trehoz\u00e1s\u00e1ra. Az Ed25519 ellen\u00e1ll\u00e1sa a t\u00f6r\u00e9sre k\u00f6r\u00fclbel\u00fcl 2^128 (\u00e1tlagosan a t\u00e1mad\u00e1shoz 2^140 bitm\u0171velet sz\u00fcks\u00e9ges), ami egyen\u00e9rt\u00e9k\u0171 az olyan algoritmusok ellen\u00e1ll\u00e1s\u00e1val, mint a NIST P-256 \u00e9s az RSA 3000 bites kulcs m\u00e9rettel, vagy egy 128 bites blokksz\u00e1rral. Az Ed25519 nem szenved a hash \u00fctk\u00f6z\u00e9sek probl\u00e9m\u00e1it\u00f3l, nem \u00e9rz\u00e9keny a cache-timing t\u00e1mad\u00e1sokra \u00e9s a k\u00fcls\u0151 csatorn\u00e1kon kereszt\u00fcli t\u00e1mad\u00e1sokra. <\/p>\n<p>A WordPress 5.2 kiad\u00e1s\u00e1ban a digit\u00e1lis al\u00e1\u00edr\u00e1sok ellen\u0151rz\u00e9se egyel\u0151re csak a platform alapvet\u0151 friss\u00edt\u00e9seit fedi le, \u00e9s alap\u00e9rtelmez\u00e9s szerint nem blokkolja a friss\u00edt\u00e9seket, csup\u00e1n t\u00e1j\u00e9koztatja a felhaszn\u00e1l\u00f3t a felmer\u00fclt probl\u00e9m\u00e1r\u00f3l. Az alap\u00e9rtelmezett blokkol\u00e1st az\u00e9rt d\u00f6nt\u00f6tt\u00e9k el, hogy ne aktiv\u00e1lj\u00e1k, mert sz\u00fcks\u00e9ges a teljes ellen\u0151rz\u00e9s \u00e9s a  <noindex><a rel=\"nofollow\" href=\"https:\/\/bugs.php.net\/bug.php?id=75938\">esetleges probl\u00e9m\u00e1k kiker\u00fcl\u00e9se.<\/a><\/noindex>A j\u00f6v\u0151ben a digit\u00e1lis al\u00e1\u00edr\u00e1sok ellen\u0151rz\u00e9s\u00e9t is tervezik a t\u00e9m\u00e1k \u00e9s pluginok telep\u00edt\u00e9si forr\u00e1s\u00e1nak verifik\u00e1l\u00e1s\u00e1hoz (a gy\u00e1rt\u00f3k saj\u00e1t kulcsukkal al\u00e1\u00edrhatj\u00e1k a kiad\u00e1sokat).<\/p>\n<p>A digit\u00e1lis al\u00e1\u00edr\u00e1sok t\u00e1mogat\u00e1s\u00e1n k\u00edv\u00fcl a WordPress 5.2-ben a k\u00f6vetkez\u0151 v\u00e1ltoz\u00e1sok emelhet\u0151k ki:<\/p>\n<ul>\n<li class=\"l\"> A \u201eWebhely eg\u00e9szs\u00e9ge\u201d r\u00e9szhez k\u00e9t \u00faj oldal ker\u00fclt hozz\u00e1ad\u00e1sra a tipikus be\u00e1ll\u00edt\u00e1si probl\u00e9m\u00e1k hibaelh\u00e1r\u00edt\u00e1s\u00e1hoz, valamint egy \u0171rlap is rendelkez\u00e9sre \u00e1ll, amelyen a fejleszt\u0151k hibaelh\u00e1r\u00edt\u00e1si inform\u00e1ci\u00f3kat k\u00fcldhetnek a webhely adminisztr\u00e1torainak;\n<li class=\"l\"> Hozz\u00e1adt\u00e1k a \u201ehalott k\u00e9perny\u0151\u201d megval\u00f3s\u00edt\u00e1s\u00e1t, amely akkor jelenik meg, ha fat\u00e1lis probl\u00e9m\u00e1k l\u00e9pnek fel, \u00e9s seg\u00edt az adminisztr\u00e1tornak a b\u0151v\u00edtm\u00e9nyekkel vagy t\u00e9m\u00e1kkal kapcsolatos probl\u00e9m\u00e1k \u00f6n\u00e1ll\u00f3 megold\u00e1s\u00e1ban, a speci\u00e1lis hibaelh\u00e1r\u00edt\u00e1si m\u00f3dba val\u00f3 bel\u00e9p\u00e9ssel;\n<li class=\"l\"> Megval\u00f3sult a b\u0151v\u00edtm\u00e9nyek kompatibilit\u00e1si ellen\u0151rz\u00e9si rendszere, amely automatikusan ellen\u0151rzi a b\u0151v\u00edtm\u00e9ny haszn\u00e1lat\u00e1nak lehet\u0151s\u00e9g\u00e9t a jelenlegi konfigur\u00e1ci\u00f3ban, figyelembe v\u00e9ve az alkalmazott PHP verzi\u00f3t. Ha a b\u0151v\u00edtm\u00e9ny m\u0171k\u00f6d\u00e9s\u00e9hez \u00fajabb PHP verzi\u00f3 sz\u00fcks\u00e9ges, a rendszer automatikusan blokkolja a b\u0151v\u00edtm\u00e9ny enged\u00e9lyez\u00e9s\u00e9t;\n<li class=\"l\"> Hozz\u00e1adva a JavaScript-k\u00f3dot tartalmaz\u00f3 modulok enged\u00e9lyez\u00e9s\u00e9nek t\u00e1mogat\u00e1sa a k\u00f6vetkez\u0151kkel: <noindex><a rel=\"nofollow\" href=\"https:\/\/webpack.js.org\/\">webpack<\/a><\/noindex> \u00e9s <noindex><a rel=\"nofollow\" href=\"https:\/\/babeljs.io\/\">Babel<\/a><\/noindex>;\n<li class=\"l\"> Hozz\u00e1adva egy \u00faj privacy-policy.php sablon, amely lehet\u0151v\u00e9 teszi a tartalom testreszab\u00e1s\u00e1t a mag\u00e1n\u00e9let v\u00e9delm\u00e9r\u0151l sz\u00f3l\u00f3 felt\u00e9telek oldal\u00e1n;\n<li class=\"l\"> A t\u00e9ma designokhoz hozz\u00e1adva a wp_body_open hook kezel\u0151je, amely lehet\u0151v\u00e9 teszi a k\u00f3d besz\u00far\u00e1s\u00e1t k\u00f6zvetlen\u00fcl a body tag ut\u00e1n;\n<li class=\"l\"> A minim\u00e1lis PHP verzi\u00f3 k\u00f6vetelm\u00e9nye 5.6.20-ra emelkedett, a b\u0151v\u00edtm\u00e9nyekben \u00e9s a t\u00e9m\u00e1kban megjelent a n\u00e9vterek \u00e9s az anon\u00edm funkci\u00f3k haszn\u00e1lat\u00e1nak lehet\u0151s\u00e9ge;\n<li class=\"l\"> Hozz\u00e1adva 13 \u00faj ikon.\n<\/ul>\n<p>Tov\u00e1bb\u00e1 megeml\u00edthet\u0151 <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.alertlogic.com\/alert-logic-uncovers-new-vulnerability-in-wordpress-wp-live-chat-cve-2019-11185\/\">felfedez\u00e9s<\/a><\/noindex> kritikus s\u00e9r\u00fcl\u00e9kenys\u00e9g a WordPress b\u0151v\u00edtm\u00e9nyben   <noindex><a rel=\"nofollow\" href=\"https:\/\/wp-livechat.com\/\">WP Live Chat<\/a><\/noindex> (CVE-2019-11185). E sebezhet\u0151s\u00e9g lehet\u0151v\u00e9 teszi tetsz\u0151leges PHP k\u00f3d v\u00e9grehajt\u00e1s\u00e1t a szerveren. A b\u0151v\u00edtm\u00e9nyt t\u00f6bb mint 27 ezer webhelyen haszn\u00e1lj\u00e1k interakt\u00edv cseveg\u0151szolg\u00e1ltat\u00e1s biztos\u00edt\u00e1s\u00e1ra, bele\u00e9rtve olyan c\u00e9gek weboldalait, mint az IKEA, Adobe, Huawei, PayPal, Tele2 \u00e9s a McDonald\u2019s (a Live Chat gyakran haszn\u00e1lj\u00e1k a c\u00e9gek weboldalain a munkat\u00e1rsakkal val\u00f3 kapcsolattart\u00e1sra ir\u00e1nyul\u00f3 zavar\u00f3 felugr\u00f3 cseveg\u0151k megval\u00f3s\u00edt\u00e1s\u00e1hoz).<\/p>\n<p>A probl\u00e9ma a f\u00e1jlok szerverre val\u00f3 felt\u00f6lt\u00e9s\u00e9nek k\u00f3dj\u00e1ban jelentkezik, amely lehet\u0151v\u00e9 teszi a megengedett f\u00e1jlt\u00edpusok ellen\u0151rz\u00e9s\u00e9nek megker\u00fcl\u00e9s\u00e9t \u00e9s egy PHP-szkript felt\u00f6lt\u00e9s\u00e9t a szerverre, majd annak k\u00f6zvetlen el\u00e9r\u00e9s\u00e9t a weben. \u00c9rdekess\u00e9g, hogy tavaly a Live Chat-ben m\u00e1r felfedeztek hasonl\u00f3 s\u00e9r\u00fcl\u00e9kenys\u00e9get (CVE-2018-12426), amely lehet\u0151v\u00e9 tette PHP-k\u00f3d felt\u00f6lt\u00e9s\u00e9t k\u00e9pk\u00e9nt, az\u00e1ltal, hogy m\u00e1s tartalomt\u00edpust adtak meg a Content-type mez\u0151ben. A probl\u00e9ma jav\u00edt\u00e1sa \u00e9rdek\u00e9ben tov\u00e1bbi ellen\u0151rz\u00e9seket adtak hozz\u00e1 a feh\u00e9r list\u00e1k \u00e9s a MIME-t\u00edpus ellen\u0151rz\u00e9s\u00e9vel. Kider\u00fclt, hogy ezeket az ellen\u0151rz\u00e9seket helytelen\u00fcl hajtott\u00e1k v\u00e9gre \u00e9s k\u00f6nnyen megker\u00fclhet\u0151k.<\/p>\n<p>K\u00fcl\u00f6n\u00f6sen a \u201e.php\u201d kiterjeszt\u00e9s\u0171 f\u00e1jlok k\u00f6zvetlen felt\u00f6lt\u00e9se tilos, de a \u201e.phtml\u201d kiterjeszt\u00e9st nem adt\u00e1k hozz\u00e1 a fekete list\u00e1hoz, amely sok szerveren a PHP \u00e9rtelmez\u0151h\u00f6z kapcsol\u00f3dik. A feh\u00e9r lista csak a k\u00e9pek felt\u00f6lt\u00e9s\u00e9t enged\u00e9lyezi, de megker\u00fclhet\u0151, ha dupla kiterjeszt\u00e9st adunk meg, p\u00e9ld\u00e1ul \u201e.gif.phtml\u201d. A MIME-t\u00edpus ellen\u0151rz\u00e9s\u00e9nek megker\u00fcl\u00e9s\u00e9hez a f\u00e1jl elej\u00e9n, a PHP k\u00f3dot tartalmaz\u00f3 c\u00edmke el\u0151tt elegend\u0151 volt megadni a \u201eGIF89a\u201d sort.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Forr\u00e1s: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50649\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f web-\u043a\u043e\u043d\u0442\u0435\u043d\u0442\u043e\u043c WordPress 5.2. \u0412\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u0435\u043d \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u0435\u043c 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