{"id":37194,"date":"2019-10-31T22:16:17","date_gmt":"2019-10-31T19:16:17","guid":{"rendered":"https:\/\/prohoster.info\/blog\/reliz-http-servera-apache-2-4-41-s-ustraneniem-uyazvimostej\/"},"modified":"2019-10-31T22:16:17","modified_gmt":"2019-10-31T19:16:17","slug":"reliz-http-servera-apache-2-4-41-s-ustraneniem-uyazvimostej","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/reliz-http-servera-apache-2-4-41-s-ustraneniem-uyazvimostej","title":{"rendered":"Az Apache 2.4.41 HTTP-szerver kiad\u00e1sa sebezhet\u0151s\u00e9gek jav\u00edt\u00e1s\u00e1val","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/www.mail-archive.com\/announce@httpd.apache.org\/msg00139.html\">Megjelent<\/a><\/noindex> az Apache 2.4.41 HTTP-szerver kiad\u00e1sa (a 2.4.40-es kiad\u00e1s kihagy\u00e1sra ker\u00fclt), amely bemutatja <noindex><a rel=\"nofollow\" href=\"http:\/\/www.apache.org\/dist\/httpd\/CHANGES_2.4.41\">23 v\u00e1ltoztat\u00e1st<\/a><\/noindex> \u00e9s jav\u00edt <noindex><a rel=\"nofollow\" href=\"http:\/\/httpd.apache.org\/security\/vulnerabilities_24.html\">6 sebezhet\u0151s\u00e9get<\/a><\/noindex>:<\/p>\n<ul>\n<li class=\"l\">  <noindex><a rel=\"nofollow\" href=\"https:\/\/www.mail-archive.com\/announce@httpd.apache.org\/msg00140.html\">CVE-2019-10081<\/a><\/noindex> \u2014 probl\u00e9ma van a mod_http2-vel, ami mem\u00f3riahib\u00e1hoz vezethet push-k\u00e9r\u00e9sek korai szakasz\u00e1ban t\u00f6rt\u00e9n\u0151 k\u00fcld\u00e9skor. A \"H2PushResource\" be\u00e1ll\u00edt\u00e1s haszn\u00e1lata eset\u00e9n a mem\u00f3ria egy ter\u00fclet\u00e9nek fel\u00fcl\u00edr\u00e1sa lehets\u00e9ges a k\u00e9r\u00e9sek feldolgoz\u00e1si medenc\u00e9j\u00e9ben, de a probl\u00e9ma a program le\u00e1ll\u00edt\u00e1s\u00e1ra korl\u00e1toz\u00f3dik, mivel az \u00edrt adatok nem \u00fcgyf\u00e9l \u00e1ltal k\u00f6z\u00f6lt inform\u00e1ci\u00f3n alapulnak;\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.mail-archive.com\/announce@httpd.apache.org\/msg00145.html\">CVE-2019-9517<\/a><\/noindex> \u2014 \u00fajonnan felfedezett sebezhet\u0151s\u00e9g <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51279\">szolg\u00e1ltat\u00e1smegtagad\u00e1si (DoS) sebezhet\u0151s\u00e9g a HTTP\/2 implement\u00e1ci\u00f3kban.<\/a><\/noindex> A t\u00e1mad\u00f3 kimer\u00edtheti a folyamat rendelkez\u00e9sre \u00e1ll\u00f3 mem\u00f3ri\u00e1j\u00e1t, \u00e9s nagy terhel\u00e9st okozhat a CPU-nak, mik\u00f6zben nyitott HTTP\/2 ablakon kereszt\u00fcl k\u00fcldi az adatokat a szerver, de a TCP ablakot z\u00e1rva tartja, ami megakad\u00e1lyozza az adatok t\u00e9nyleges \u00edr\u00e1s\u00e1t a socketbe;<br \/>\nCVE-2019-10098 <\/p>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.mail-archive.com\/announce@httpd.apache.org\/msg00144.html\">\u2014 probl\u00e9ma a mod_rewrite-ban, amely lehet\u0151v\u00e9 teszi a szerver sz\u00e1m\u00e1ra, hogy \u00e1tkonvert\u00e1lja a hivatkoz\u00e1sokat m\u00e1s forr\u00e1sokra (open redirect). N\u00e9h\u00e1ny mod_rewrite be\u00e1ll\u00edt\u00e1s a felhaszn\u00e1l\u00f3t egy m\u00e1sik hivatkoz\u00e1sra terelheti, amelyet a megl\u00e9v\u0151 \u00e1tkonvert\u00e1l\u00e1s param\u00e9ter\u00e9ben egy \u00faj sort k\u00f3dol\u00f3 szimb\u00f3lummal kodoltak. A probl\u00e9ma blokkol\u00e1s\u00e1hoz a RegexDefaultOptions-ban haszn\u00e1lhat\u00f3 a PCRE_DOTALL z\u00e1szl\u00f3, amely mostant\u00f3l alap\u00e9rtelmezett;<\/a><\/noindex> \u2014 probl\u00e9ma a mod_rewrite-ban, ami lehet\u0151v\u00e9 teszi a szerver sz\u00e1m\u00e1ra, hogy m\u00e1s forr\u00e1sokra ir\u00e1ny\u00edtsa a k\u00e9r\u00e9seket (open redirect). A mod_rewrite bizonyos be\u00e1ll\u00edt\u00e1sai arra vezethetnek, hogy a felhaszn\u00e1l\u00f3 egy m\u00e1sik linkre ir\u00e1nyul, amely a megl\u00e9v\u0151 \u00e1tir\u00e1ny\u00edt\u00e1sban a param\u00e9terek k\u00f6z\u00f6tt tal\u00e1lhat\u00f3 sorv\u00e9gz\u0151d\u00e9st haszn\u00e1l\u00f3 k\u00f3dot tartalmaz. A probl\u00e9ma megakad\u00e1lyoz\u00e1s\u00e1hoz a RegexDefaultOptions-ban a PCRE_DOTALL z\u00e1szl\u00f3 haszn\u00e1lhat\u00f3, amely most m\u00e1r alap\u00e9rtelmezett;\n<li class=\"l\">  <noindex><a rel=\"nofollow\" href=\"https:\/\/www.mail-archive.com\/announce@httpd.apache.org\/msg00142.html\">\u2014 lehet\u0151s\u00e9g Cross-Site Scripting (XSS) k\u00eds\u00e9rletekre a mod_proxy \u00e1ltal kiadott hibaoldalakon. Ezeken az oldalakon a k\u00e9r\u00e9sb\u0151l kapott URL-t helyezik a hivatkoz\u00e1sba, amelyben a t\u00e1mad\u00f3 karakterek kiemel\u00e9s\u00e9vel tetsz\u0151leges HTML-k\u00f3dot helyezhet el;<\/a><\/noindex> \u2014 lehet\u0151s\u00e9g cross-site scriptingre (XSS) a mod_proxy \u00e1ltal megjelen\u00edtett hiboldalakon. Ezeken az oldalakon a linkbe a k\u00e9r\u00e9sb\u0151l sz\u00e1rmaz\u00f3 URL-t helyezik, amelyen az t\u00e1mad\u00f3 a karakterek escaping-se seg\u00edts\u00e9g\u00e9vel tetsz\u0151leges HTML-k\u00f3dot illeszthet be;\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.mail-archive.com\/announce@httpd.apache.org\/msg00143.html\">\u2014 verem t\u00falcsordul\u00e1s \u00e9s NULL pointer derefer\u00e1l\u00e1s a mod_remoteip-ben, amelyet a PROXY protokoll fejl\u00e9ceinek manipul\u00e1l\u00e1s\u00e1val lehet kihaszn\u00e1lni. A t\u00e1mad\u00e1s csak a proxy-szerver be\u00e1ll\u00edt\u00e1saiban haszn\u00e1lt r\u00e9szr\u0151l ind\u00edthat\u00f3, nem a kliens k\u00e9r\u00e9s\u00e9n kereszt\u00fcl;<\/a><\/noindex> \u2014 verem t\u00falcsordul\u00e1s \u00e9s NULL mutat\u00f3 derefer\u00e1l\u00e1sa a mod_remoteip-ben, amely a PROXY protokollfejl\u00e9cek manipul\u00e1ci\u00f3ja seg\u00edts\u00e9g\u00e9vel kiakn\u00e1zhat\u00f3. A t\u00e1mad\u00e1s csak a proxy-szerver be\u00e1ll\u00edt\u00e1saiban haszn\u00e1lt forr\u00e1sb\u00f3l hajthat\u00f3 v\u00e9gre, nem az \u00fcgyf\u00e9l k\u00e9r\u00e9s\u00e9vel;\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.mail-archive.com\/announce@httpd.apache.org\/msg00141.html\">\u2014 sebezhet\u0151s\u00e9g a mod_http2-ben, amely lehet\u0151v\u00e9 teszi, hogy a kapcsolat befejez\u00e9sekor adatokat olvasunk m\u00e1r felszabad\u00edtott mem\u00f3riater\u00fcletr\u0151l (read-after-free).<\/a><\/noindex> \u2014 sebezhet\u0151s\u00e9g a mod_http2-ben, amely lehet\u0151v\u00e9 teszi, hogy a kapcsolat bez\u00e1r\u00e1sakor tartalom olvas\u00e1s\u00e1t kezdem\u00e9nyezze egy m\u00e1r felszabad\u00edtott mem\u00f3ria ter\u00fcletb\u0151l (read-after-free).\n<\/ul>\n<p>A legszembet\u0171n\u0151bb nem biztons\u00e1gi jelleg\u0171 v\u00e1ltoz\u00e1sok: <\/p>\n<ul>\n<li class=\"l\"> A mod_session-ben \u00faj be\u00e1ll\u00edt\u00e1s ker\u00fclt bevezet\u00e9sre: SessionExpiryUpdateInterval, amely lehet\u0151v\u00e9 teszi a munkamenet\/keksz lej\u00e1rati idej\u00e9nek friss\u00edt\u00e9si intervallum\u00e1nak meghat\u00e1roz\u00e1s\u00e1t;\n<li class=\"l\"> Az Apache 2.4.41 jav\u00edt\u00e1sai k\u00f6z\u00f6tt szerepelnek a mindenf\u00e9le megb\u00edzhat\u00f3 csom\u00f3pontok \u00e1ltal elleni XSS\/XSRF t\u00e1mad\u00e1sok meger\u0151s\u00edtett v\u00e9delme is.\n<li class=\"l\"> A hib\u00e1s oldalak tiszt\u00edt\u00e1sa megt\u00f6rt\u00e9nt, amely a k\u00e9rd\u00e9sekb\u0151l sz\u00e1rmaz\u00f3 inform\u00e1ci\u00f3k kiemel\u00e9s\u00e9re ir\u00e1nyult az \u00e9rintett oldalakon;\n<li class=\"l\"> A mod_http2 biztos\u00edtja a \"LimitRequestFieldSize\" param\u00e9ter \u00e9rt\u00e9k\u00e9nek figyelembev\u00e9tel\u00e9t, amely kor\u00e1bban csak az HTTP\/1.1 fejl\u00e9ceinek ellen\u0151rz\u00e9s\u00e9re \u00e9rv\u00e9nyes\u00fclt;\n<li class=\"l\"> Biztos\u00edtott\u00e1k a mod_proxy_hcheck konfigur\u00e1ci\u00f3 l\u00e9trehoz\u00e1s\u00e1t a BalancerMember haszn\u00e1latakor;\n<li class=\"l\"> Cs\u00f6kkent a mem\u00f3riafogyaszt\u00e1s a mod_dav-ban a PROPFIND parancs haszn\u00e1latakor nagy gy\u0171jtem\u00e9nyeken;\n<li class=\"l\"> A mod_proxy \u00e9s mod_ssl eset\u00e9ben megoldott\u00e1k a tan\u00fas\u00edtv\u00e1nyok \u00e9s az SSL be\u00e1ll\u00edt\u00e1sainak megad\u00e1s\u00e1val kapcsolatos probl\u00e9m\u00e1kat a Proxy blokkban;\n<li class=\"l\"> A mod_proxy-ban enged\u00e9lyezt\u00e9k az SSLProxyCheckPeer* be\u00e1ll\u00edt\u00e1sok haszn\u00e1lat\u00e1t minden proxy modulhoz;\n<li class=\"l\"> A modul lehet\u0151s\u00e9gei kib\u0151v\u00fcltek <noindex><a rel=\"nofollow\" href=\"https:\/\/httpd.apache.org\/docs\/2.4\/mod\/mod_md.html\">mod_md<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=47403\">a<\/a><\/noindex> a Let\u2019s Encrypt projekttel, amely az ACME (Automatic Certificate Management Environment) protokoll haszn\u00e1lat\u00e1val automatiz\u00e1lja a tan\u00fas\u00edtv\u00e1nyok megszerz\u00e9s\u00e9t \u00e9s karbantart\u00e1s\u00e1t:\n<ul>\n<li class=\"l\"> Hozz\u00e1adt\u00e1k a protokoll m\u00e1sodik verzi\u00f3j\u00e1t <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=48255\">ACMEv2<\/a><\/noindex>, amely most m\u00e1r alap\u00e9rtelmezett\u00e9 v\u00e1lt, \u00e9s <noindex><a rel=\"nofollow\" href=\"https:\/\/community.letsencrypt.org\/t\/acme-v2-scheduled-deprecation-of-unauthenticated-resource-gets\/74380\">haszn\u00e1lja<\/a><\/noindex> \u00fcres POST k\u00e9r\u00e9seket haszn\u00e1l a GET helyett.\n<li class=\"l\"> T\u00e1mogat\u00e1s ker\u00fclt bevezet\u00e9sre a TLS-ALPN-01 (RFC 7301, Application-Layer Protocol Negotiation) kiterjeszt\u00e9s alap\u00fa ellen\u0151rz\u00e9shez, amelyet HTTP\/2-ben haszn\u00e1lnak.\n<li class=\"l\"> Megsz\u0171nt a 'tls-sni-01' ellen\u0151rz\u00e9si m\u00f3dszer t\u00e1mogat\u00e1sa (a k\u00f6vetkez\u0151k miatt <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=47883\">sebezhet\u0151s\u00e9gek<\/a><\/noindex>).\n<li class=\"l\"> \u00daj parancsok ker\u00fcltek hozz\u00e1ad\u00e1sra a 'dns-01' m\u00f3dszer ellen\u0151rz\u00e9s\u00e9nek be\u00e1ll\u00edt\u00e1s\u00e1hoz \u00e9s megszak\u00edt\u00e1s\u00e1hoz.\n<li class=\"l\"> T\u00e1mogat\u00e1s ker\u00fclt hozz\u00e1ad\u00e1sra <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=46817\">maszkok<\/a><\/noindex> a tan\u00fas\u00edtv\u00e1nyokban, amikor DNS-alap\u00fa ellen\u0151rz\u00e9st ( 'dns-01') alkalmaznak.\n<li class=\"l\"> Megval\u00f3sult a 'md-status' kezel\u0151 \u00e9s a tan\u00fas\u00edtv\u00e1ny st\u00e1tusz\u00e1t megjelen\u00edt\u0151 oldal \"https:\/\/domain\/.httpd\/certificate-status\".\n<li class=\"l\">  \u00daj direkt\u00edv\u00e1k ker\u00fcltek bevezet\u00e9sre: \"MDCertificateFile\" \u00e9s \"MDCertificateKeyFile\", amelyek a domainek be\u00e1ll\u00edt\u00e1sait szab\u00e1lyozz\u00e1k statikus f\u00e1jlokon kereszt\u00fcl (automatikus friss\u00edt\u00e9s t\u00e1mogat\u00e1sa n\u00e9lk\u00fcl).\n<li class=\"l\"> Hozz\u00e1adva a &#171;MDMessageCmd&#187; utas\u00edt\u00e1s az esem\u00e9nyek &#8216;renewed&#8217;, &#8216;expiring&#8217; vagy &#8216;errored&#8217; k\u00fcls\u0151 parancsainak megh\u00edv\u00e1s\u00e1ra.\n<li class=\"l\"> Hozz\u00e1adva a &#171;MDWarnWindow&#187; utas\u00edt\u00e1s a tan\u00fas\u00edtv\u00e1ny lej\u00e1rat\u00e1nak figyelmeztet\u0151 \u00fczenet\u00e9nek be\u00e1ll\u00edt\u00e1s\u00e1hoz.\n<\/ul>\n<\/ul>\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=51298\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 HTTP-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 Apache 2.4.41 (\u0432\u044b\u043f\u0443\u0441\u043a 2.4.40 \u0431\u044b\u043b \u043f\u0440\u043e\u043f\u0443\u0449\u0435\u043d), \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043e 23 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u043e 6 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439: CVE-2019-10081 &#8212; \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432 mod_http2, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043f\u043e\u0432\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u044e \u043f\u0430\u043c\u044f\u0442\u0438 \u043f\u0440\u0438 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0435 push-\u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u043d\u0430 \u043e\u0447\u0435\u043d\u044c 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