{"id":477441,"date":"2023-08-09T09:15:09","date_gmt":"2023-08-09T09:15:09","guid":{"rendered":""},"modified":"2023-09-05T11:14:42","modified_gmt":"2023-09-05T11:14:42","slug":"heartbleed","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/tr\/wiki\/heartbleed\/","title":{"rendered":"Kalp kanamas\u0131"},"content":{"rendered":"<p>Heartbleed, OpenSSL \u015fifreleme yaz\u0131l\u0131m\u0131 kitapl\u0131\u011f\u0131nda bulunan ve \u0130nternet&#039;in g\u00fcvenli\u011fini sa\u011flamak i\u00e7in kullan\u0131lan SSL\/TLS \u015fifrelemesiyle korunan bilgilerin \u00e7al\u0131nmas\u0131na olanak tan\u0131yan kritik bir g\u00fcvenlik a\u00e7\u0131\u011f\u0131d\u0131r.<\/p>\n<h2>Tarihsel Bir Bak\u0131\u015f: Kalp Kanamas\u0131n\u0131 \u00c7\u00f6zmek<\/h2>\n<p>Heartbleed ilk kez Nisan 2014&#039;te kamuya duyuruldu ve Codedenomicon ve Google&#039;daki g\u00fcvenlik m\u00fchendisleri taraf\u0131ndan ba\u011f\u0131ms\u0131z olarak ke\u015ffedildi. \u0130nternetteki \u015fifreleme korumas\u0131 i\u00e7in en pop\u00fcler k\u00fct\u00fcphanelerden biri olan OpenSSL \u015fifreleme k\u00fct\u00fcphanesindeki bir g\u00fcvenlik hatas\u0131d\u0131r. Veriler payla\u015f\u0131lmad\u0131\u011f\u0131nda bile ba\u011flant\u0131lar\u0131 canl\u0131 tutmak i\u00e7in kullan\u0131lan bir sistem olan OpenSSL k\u00fct\u00fcphanesinin &quot;kalp at\u0131\u015f\u0131&quot; b\u00f6l\u00fcm\u00fcnde bulundu\u011fu i\u00e7in bu \u015fekilde adland\u0131r\u0131lm\u0131\u015ft\u0131r.<\/p>\n<h2>Heartbleed&#039;i Geni\u015fletmek: Daha Derin Bir Bak\u0131\u015f<\/h2>\n<p>Heartbleed \u00f6zellikle OpenSSL&#039;in &quot;kalp at\u0131\u015f\u0131&quot; uzant\u0131s\u0131n\u0131 etkiler. Bu, istemci ile sunucu aras\u0131nda g\u00fcvenli bir ba\u011flant\u0131 sa\u011flamak i\u00e7in kullan\u0131lan Aktar\u0131m Katman\u0131 G\u00fcvenli\u011fi (TLS) protokol\u00fcn\u00fcn OpenSSL uygulamas\u0131ndaki iste\u011fe ba\u011fl\u0131 bir \u00f6zelliktir.<\/p>\n<p>G\u00fcvenlik a\u00e7\u0131\u011f\u0131, kalp at\u0131\u015f\u0131 iste\u011finin i\u015flenme bi\u00e7iminde mevcuttur. Sald\u0131rgan, k\u00f6t\u00fc ama\u00e7la haz\u0131rlanm\u0131\u015f bir kalp at\u0131\u015f\u0131 iste\u011fi g\u00f6ndererek, bir sunucuyu veya istemciyi, kalp at\u0131\u015f\u0131 kapsam\u0131n\u0131n \u00e7ok \u00f6tesinde, belle\u011finde depolanan b\u00fcy\u00fck miktarda veriyi geri g\u00f6ndermesi i\u00e7in kand\u0131rabilir.<\/p>\n<h2>\u0130\u00e7 Mekanizma: Heartbleed Nas\u0131l \u00c7al\u0131\u015f\u0131r?<\/h2>\n<p>OpenSSL&#039;deki kalp at\u0131\u015f\u0131 mekanizmas\u0131, sunucuya bir y\u00fck ve y\u00fck uzunlu\u011funa sahip bir istek (&quot;kalp at\u0131\u015f\u0131&quot; iste\u011fi) g\u00f6ndererek \u00e7al\u0131\u015f\u0131r. Sunucu daha sonra h\u00e2l\u00e2 \u00e7evrimi\u00e7i oldu\u011funu ve dinledi\u011fini do\u011frulamak i\u00e7in veriyi tekrarlar.<\/p>\n<p>Ancak Heartbleed hatas\u0131, OpenSSL&#039;nin istekte g\u00f6nderilen y\u00fck uzunlu\u011funun ger\u00e7ek y\u00fcke kar\u015f\u0131l\u0131k geldi\u011fini do\u011frulamamas\u0131 nedeniyle ortaya \u00e7\u0131k\u0131yor. Sald\u0131rgan, k\u00fc\u00e7\u00fck bir veri y\u00fck\u00fcyle bir kalp at\u0131\u015f\u0131 iste\u011fi g\u00f6nderebilir, ancak sunucuya \u00e7ok daha b\u00fcy\u00fck bir veri y\u00fck\u00fc g\u00f6nderdi\u011fini s\u00f6yleyerek sunucuyu, belle\u011finin 64 kilobayta kadar\u0131n\u0131 geri g\u00f6ndermesi i\u00e7in kand\u0131r\u0131r. Bu bellek, kullan\u0131c\u0131 adlar\u0131ndan ve parolalardan SSL \u015fifrelemesi i\u00e7in kullan\u0131lan anahtarlara kadar her \u015feyi i\u00e7erebilir.<\/p>\n<h2>Heartbleed&#039;in Temel \u00d6zellikleri<\/h2>\n<ul>\n<li><strong>Veri s\u0131z\u0131nt\u0131s\u0131:<\/strong> Heartbleed, \u00f6zel anahtarlar, kullan\u0131c\u0131 adlar\u0131 ve \u015fifreler gibi hassas bilgiler de dahil olmak \u00fczere sunucunun belle\u011findeki \u00f6nemli miktarda veriyi a\u00e7\u0131\u011fa \u00e7\u0131karabilir.<\/li>\n<li><strong>Tespit edilemezlik:<\/strong> Heartbleed hatas\u0131n\u0131n kullan\u0131lmas\u0131 hi\u00e7bir iz b\u0131rakmaz, bu da sistemin ele ge\u00e7irilip ge\u00e7irilmedi\u011fini tespit etmeyi ve belirlemeyi zorla\u015ft\u0131r\u0131r.<\/li>\n<li><strong>Geni\u015f Etki:<\/strong> OpenSSL&#039;nin yayg\u0131n kullan\u0131m\u0131 g\u00f6z \u00f6n\u00fcne al\u0131nd\u0131\u011f\u0131nda, Heartbleed g\u00fcvenlik a\u00e7\u0131\u011f\u0131n\u0131n potansiyel kapsam\u0131 \u00e7ok b\u00fcy\u00fckt\u00fc ve \u0130nternet&#039;teki web sunucular\u0131n\u0131n \u00f6nemli bir b\u00f6l\u00fcm\u00fcn\u00fc etkiliyordu.<\/li>\n<\/ul>\n<h2>Kalp Kanamas\u0131 Sald\u0131r\u0131s\u0131 T\u00fcrleri<\/h2>\n<p>Heartbleed g\u00fcvenlik a\u00e7\u0131\u011f\u0131, \u00f6ncelikle kullan\u0131lan OpenSSL yap\u0131s\u0131n\u0131n t\u00fcr\u00fcne ve ilgili varl\u0131klar\u0131n rollerine ba\u011fl\u0131 olarak \u00e7e\u015fitli \u015fekillerde ortaya \u00e7\u0131kabilir.<\/p>\n<table>\n<thead>\n<tr>\n<th>Sald\u0131r\u0131 T\u00fcr\u00fc<\/th>\n<th>Tan\u0131m<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Sunucu Taraf\u0131 Heartbleed<\/td>\n<td>Sald\u0131rgan, sunucuya k\u00f6t\u00fc niyetli kalp at\u0131\u015f\u0131 istekleri g\u00f6ndererek sunucuyu olmas\u0131 gerekenden daha fazla veriyle yan\u0131t vermesi i\u00e7in kand\u0131r\u0131r.<\/td>\n<\/tr>\n<tr>\n<td>\u0130stemci Taraf\u0131nda Heartbleed<\/td>\n<td>Sald\u0131rgan, istemcinin OpenSSL kitapl\u0131\u011f\u0131ndaki Heartbleed g\u00fcvenlik a\u00e7\u0131\u011f\u0131ndan yararlanarak istemciyi k\u00f6t\u00fc ama\u00e7l\u0131 bir sunucuya ba\u011flanmas\u0131 i\u00e7in kand\u0131r\u0131r.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Heartbleed&#039;\u0131 Ele Alma: Sorunlar ve \u00c7\u00f6z\u00fcmler<\/h2>\n<p>Heartbleed istismar\u0131 ciddi g\u00fcvenlik sorunlar\u0131 yarat\u0131r. Hassas bilgileri ortaya \u00e7\u0131karabilir, kriptografik anahtarlar\u0131 tehlikeye atabilir ve daha fazlas\u0131n\u0131 yapabilir. Ancak birka\u00e7 \u00e7\u00f6z\u00fcm uyguland\u0131:<\/p>\n<ul>\n<li><strong>Yama:<\/strong> OpenSSL&#039;i Heartbleed g\u00fcvenlik a\u00e7\u0131\u011f\u0131n\u0131 i\u00e7ermeyen bir s\u00fcr\u00fcme (OpenSSL 1.0.1g ve \u00fcst\u00fc) g\u00fcncellemek en do\u011frudan \u00e7\u00f6z\u00fcmd\u00fcr.<\/li>\n<li><strong>Anahtar D\u00f6nd\u00fcrme:<\/strong> D\u00fczeltme eki uyguland\u0131ktan sonra ortaya \u00e7\u0131km\u0131\u015f olabilecek t\u00fcm anahtarlar\u0131n ve sertifikalar\u0131n de\u011fi\u015ftirilmesi \u00f6nemlidir.<\/li>\n<li><strong>\u015eifre De\u011fi\u015fiklikleri:<\/strong> Kullan\u0131c\u0131lar, g\u00fcvenlik a\u00e7\u0131\u011f\u0131 bulunan bir hizmet sunucular\u0131na yama uygulad\u0131ktan sonra \u015fifrelerini de\u011fi\u015ftirmelidir.<\/li>\n<\/ul>\n<h2>Benzer G\u00fcvenlik A\u00e7\u0131klar\u0131yla Kar\u015f\u0131la\u015ft\u0131rmalar<\/h2>\n<p>Heartbleed benzersiz bir g\u00fcvenlik a\u00e7\u0131\u011f\u0131 olmas\u0131na ra\u011fmen, Shellshock ve POODLE gibi internetin g\u00fcvenli\u011fini etkileyen ba\u015fka g\u00fcvenlik a\u00e7\u0131klar\u0131 da olmu\u015ftur. Bu g\u00fcvenlik a\u00e7\u0131klar\u0131 etkilenen yaz\u0131l\u0131m, etki ve yararlan\u0131labilirlik a\u00e7\u0131s\u0131ndan farkl\u0131l\u0131k g\u00f6steriyordu.<\/p>\n<h2>Gelecek Perspektifleri ve Teknolojiler<\/h2>\n<p>Heartbleed, daha iyi g\u00fcvenlik protokolleri ve uygulamalar\u0131n\u0131n geli\u015ftirilmesini etkileyerek bu t\u00fcr g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 bulmak ve d\u00fczeltmek i\u00e7in geli\u015ftirilmi\u015f mekanizmalara yol a\u00e7t\u0131. Olay, d\u00fczenli g\u00fcvenlik denetimlerinin, otomatik testlerin ve h\u0131zl\u0131 yama ve g\u00fcncellemelerin gereklili\u011finin \u00f6nemini vurgulad\u0131.<\/p>\n<h2>Proxy Sunucular\u0131 ve Heartbleed<\/h2>\n<p>Proxy sunucusu, di\u011fer sunuculardan kaynak arayan istemcilerden gelen istekler i\u00e7in arac\u0131 g\u00f6revi g\u00f6r\u00fcr. Proxy sunucusu OpenSSL kullan\u0131yorsa Heartbleed&#039;e kar\u015f\u0131 savunmas\u0131z olabilir ve potansiyel olarak hassas istemci ve sunucu bilgilerini s\u0131zd\u0131rabilir.<\/p>\n<p>Ancak g\u00fcncellenmi\u015f, g\u00fcvenli bir proxy sunucusu kullanmak da Heartbleed&#039;e kar\u015f\u0131 koruma stratejisinin bir par\u00e7as\u0131 olabilir. \u015eirketler, t\u00fcm trafi\u011fin g\u00fcvenli bir proxy \u00fczerinden y\u00f6nlendirilmesini sa\u011flayarak i\u00e7 a\u011flar\u0131 i\u00e7in ek bir koruma katman\u0131 ekleyebilir.<\/p>\n<h2>\u0130lgili Ba\u011flant\u0131lar<\/h2>\n<p>Heartbleed hakk\u0131nda daha detayl\u0131 bilgi i\u00e7in a\u015fa\u011f\u0131daki kaynaklara g\u00f6z atabilirsiniz:<\/p>\n<ul>\n<li><a href=\"http:\/\/heartbleed.com\/\" target=\"_new\" rel=\"noopener nofollow\">Heartbleed Resmi Web Sitesi<\/a><\/li>\n<li><a href=\"https:\/\/www.openssl.org\/\" target=\"_new\" rel=\"noopener nofollow\">OpenSSL Projesi<\/a><\/li>\n<li><a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2014-0160\" target=\"_new\" rel=\"noopener nofollow\">Ulusal G\u00fcvenlik A\u00e7\u0131\u011f\u0131 Veritaban\u0131<\/a><\/li>\n<li><a href=\"https:\/\/xkcd.com\/1354\/\" target=\"_new\" rel=\"noopener nofollow\">xkcd&#039;den Heartbleed A\u00e7\u0131klamas\u0131<\/a><\/li>\n<li><a href=\"https:\/\/tools.ietf.org\/html\/rfc6520\" target=\"_new\" rel=\"noopener nofollow\">RFC 6520: Aktar\u0131m Katman\u0131 G\u00fcvenli\u011fi (TLS) ve Datagram Aktar\u0131m Katman\u0131 G\u00fcvenli\u011fi (DTLS) Kalp At\u0131\u015f\u0131 Uzant\u0131s\u0131<\/a><\/li>\n<\/ul>","protected":false},"featured_media":468533,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-477441","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Heartbleed: A Comprehensive Guide<\/mark>","faq_items":[{"question":"What is Heartbleed?","answer":"<p>Heartbleed is a significant vulnerability in the OpenSSL cryptographic software library that allows an attacker to steal information that's normally protected by SSL\/TLS encryption, which is used to secure the Internet.<\/p>"},{"question":"When was Heartbleed first discovered?","answer":"<p>Heartbleed was first publicly disclosed in April 2014, discovered independently by security engineers at Codenomicon and Google.<\/p>"},{"question":"How does the Heartbleed bug work?","answer":"<p>Heartbleed exploits a flaw in the \"heartbeat\" feature of OpenSSL. An attacker sends a malformed heartbeat request to a server, indicating a large payload size but only sending a small one. Since OpenSSL doesn't verify that the payload size matches the actual payload, the server ends up sending back up to 64 kilobytes of its memory.<\/p>"},{"question":"What types of attacks can occur due to Heartbleed?","answer":"<p>Heartbleed vulnerability can manifest in server-side and client-side attacks. In a server-side attack, an attacker sends malicious heartbeat requests to the server, while in a client-side attack, an attacker tricks a client into connecting to a malicious server, exploiting the Heartbleed vulnerability in the client's OpenSSL library.<\/p>"},{"question":"What steps can be taken to address the Heartbleed vulnerability?","answer":"<p>The primary steps to address the Heartbleed vulnerability involve patching the OpenSSL software to a version that doesn't contain the Heartbleed vulnerability, rotating all keys and certificates that could have been revealed, and changing user passwords after a vulnerable service has patched their servers.<\/p>"},{"question":"How does Heartbleed relate to proxy servers?","answer":"<p>If a proxy server uses OpenSSL, it could be vulnerable to Heartbleed, which can potentially leak sensitive client and server information. However, by directing all traffic through a secure, updated proxy server, it can add an additional layer of protection against Heartbleed.<\/p>"},{"question":"What impact has Heartbleed had on future technologies and security protocols?","answer":"<p>Heartbleed has prompted the development of improved security protocols and practices. It has highlighted the need for regular security audits, automated testing, and timely patching and updates.<\/p>"},{"question":"Where can I find more detailed information about Heartbleed?","answer":"<p>More detailed information on Heartbleed can be found on the official Heartbleed website, OpenSSL Project site, the National Vulnerability Database, and through other resources such as an explanation comic by xkcd and the official RFC document on the TLS and DTLS Heartbeat Extension.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/tr\/wp-json\/wp\/v2\/wiki\/477441","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/tr\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/tr\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/tr\/wp-json\/wp\/v2\/wiki\/477441\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/tr\/wp-json\/wp\/v2\/media\/468533"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/tr\/wp-json\/wp\/v2\/media?parent=477441"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}