{"id":22788,"date":"2025-02-04T08:32:52","date_gmt":"2025-02-04T05:32:52","guid":{"rendered":"https:\/\/www.cenuta.com\/blog\/?p=22788"},"modified":"2025-02-04T08:32:54","modified_gmt":"2025-02-04T05:32:54","slug":"sifir-gun-aciklari-nedir-nasil-onlenir-ve-ornekleri-nelerdir","status":"publish","type":"post","link":"https:\/\/www.cenuta.com\/blog\/sifir-gun-aciklari-nedir-nasil-onlenir-ve-ornekleri-nelerdir\/","title":{"rendered":"S\u0131f\u0131r G\u00fcn A\u00e7\u0131klar\u0131 Nedir? Nas\u0131l \u00d6nlenir ve \u00d6rnekleri Nelerdir?"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_71 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0130\u00e7indekiler<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6a20ac233267c\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a20ac233267c\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.cenuta.com\/blog\/sifir-gun-aciklari-nedir-nasil-onlenir-ve-ornekleri-nelerdir\/#Sifir_Gun_Acigi_Nedir\" title=\"S\u0131f\u0131r G\u00fcn A\u00e7\u0131\u011f\u0131 Nedir?\">S\u0131f\u0131r G\u00fcn A\u00e7\u0131\u011f\u0131 Nedir?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.cenuta.com\/blog\/sifir-gun-aciklari-nedir-nasil-onlenir-ve-ornekleri-nelerdir\/#Sifir_Gun_Aciklari_Neden_Tehlikelidir\" title=\"S\u0131f\u0131r G\u00fcn A\u00e7\u0131klar\u0131 Neden Tehlikelidir?\">S\u0131f\u0131r G\u00fcn A\u00e7\u0131klar\u0131 Neden Tehlikelidir?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.cenuta.com\/blog\/sifir-gun-aciklari-nedir-nasil-onlenir-ve-ornekleri-nelerdir\/#Sifir_Gun_Aciklari_Nasil_Ortaya_Cikar\" title=\"S\u0131f\u0131r G\u00fcn A\u00e7\u0131klar\u0131 Nas\u0131l Ortaya \u00c7\u0131kar?\">S\u0131f\u0131r G\u00fcn A\u00e7\u0131klar\u0131 Nas\u0131l Ortaya \u00c7\u0131kar?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.cenuta.com\/blog\/sifir-gun-aciklari-nedir-nasil-onlenir-ve-ornekleri-nelerdir\/#Sifir_Gun_Aciklari_Nasil_Onlenir\" title=\"S\u0131f\u0131r G\u00fcn A\u00e7\u0131klar\u0131 Nas\u0131l \u00d6nlenir?\">S\u0131f\u0131r G\u00fcn A\u00e7\u0131klar\u0131 Nas\u0131l \u00d6nlenir?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.cenuta.com\/blog\/sifir-gun-aciklari-nedir-nasil-onlenir-ve-ornekleri-nelerdir\/#Sifir_Gun_Aciklari_Icin_Ornekler\" title=\"S\u0131f\u0131r G\u00fcn A\u00e7\u0131klar\u0131 \u0130\u00e7in \u00d6rnekler\">S\u0131f\u0131r G\u00fcn A\u00e7\u0131klar\u0131 \u0130\u00e7in \u00d6rnekler<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.cenuta.com\/blog\/sifir-gun-aciklari-nedir-nasil-onlenir-ve-ornekleri-nelerdir\/#Sonuc\" title=\"Sonu\u00e7\">Sonu\u00e7<\/a><\/li><\/ul><\/nav><\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sifir_Gun_Acigi_Nedir\"><\/span>S\u0131f\u0131r G\u00fcn A\u00e7\u0131\u011f\u0131 Nedir?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>S\u0131f\u0131r g\u00fcn a\u00e7\u0131\u011f\u0131 (<strong>Zero-Day Vulnerability<\/strong>), yaz\u0131l\u0131m, donan\u0131m veya a\u011f bile\u015fenlerinde ke\u015ffedilen ancak hen\u00fcz geli\u015ftirici taraf\u0131ndan d\u00fczeltilmemi\u015f g\u00fcvenlik a\u00e7\u0131klar\u0131d\u0131r. &#8220;S\u0131f\u0131r g\u00fcn&#8221; terimi, a\u00e7\u0131\u011f\u0131n tespit edilmesi ile istismar edilmesi aras\u0131ndaki s\u00fcrenin neredeyse s\u0131f\u0131r olmas\u0131 anlam\u0131na gelir. Bu t\u00fcr a\u00e7\u0131klar, siber sald\u0131rganlar i\u00e7in b\u00fcy\u00fck bir f\u0131rsat olu\u015fturur ve genellikle fidye yaz\u0131l\u0131mlar\u0131, casus yaz\u0131l\u0131mlar veya veri s\u0131zd\u0131rma sald\u0131r\u0131lar\u0131nda kullan\u0131l\u0131r.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sifir_Gun_Aciklari_Neden_Tehlikelidir\"><\/span>S\u0131f\u0131r G\u00fcn A\u00e7\u0131klar\u0131 Neden Tehlikelidir?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Savunmas\u0131z Sistemler<\/strong>: A\u00e7\u0131k, geli\u015ftiriciler taraf\u0131ndan d\u00fczeltilmeden \u00f6nce sald\u0131rganlar taraf\u0131ndan kullan\u0131labilir.<\/li>\n\n\n\n<li><strong>Hedefli Sald\u0131r\u0131lar<\/strong>: \u00d6zel hedeflere y\u00f6nelik siber casusluk veya devlet destekli sald\u0131r\u0131larda kullan\u0131l\u0131r.<\/li>\n\n\n\n<li><strong>Geni\u015f Etki Alan\u0131<\/strong>: Bir\u00e7ok yaz\u0131l\u0131m ve sistem etkilendi\u011finde b\u00fcy\u00fck \u00f6l\u00e7ekli siber sald\u0131r\u0131lara yol a\u00e7abilir.<\/li>\n\n\n\n<li><strong>G\u00fcvenlik \u00c7\u00f6z\u00fcmlerini A\u015fma<\/strong>: Klasik antivir\u00fcs ve g\u00fcvenlik duvarlar\u0131 s\u0131f\u0131r g\u00fcn sald\u0131r\u0131lar\u0131n\u0131 tespit etmekte yetersiz kalabilir.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sifir_Gun_Aciklari_Nasil_Ortaya_Cikar\"><\/span>S\u0131f\u0131r G\u00fcn A\u00e7\u0131klar\u0131 Nas\u0131l Ortaya \u00c7\u0131kar?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Ara\u015ft\u0131rmac\u0131lar veya Etik Hackerlar taraf\u0131ndan ke\u015ffedilir<\/strong> ve yaz\u0131l\u0131m geli\u015ftiricilerine bildirilir.<\/li>\n\n\n\n<li><strong>Siber su\u00e7lular veya k\u00f6t\u00fc niyetli hackerlar taraf\u0131ndan fark edilir<\/strong> ve sald\u0131r\u0131larda kullan\u0131l\u0131r.<\/li>\n\n\n\n<li><strong>G\u00fcvenlik \u015firketleri veya tehdit istihbarat analistleri taraf\u0131ndan analiz edilir<\/strong>, ard\u0131ndan g\u00fcvenlik g\u00fcncellemeleri yay\u0131nlan\u0131r.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sifir_Gun_Aciklari_Nasil_Onlenir\"><\/span>S\u0131f\u0131r G\u00fcn A\u00e7\u0131klar\u0131 Nas\u0131l \u00d6nlenir?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Tamamen \u00f6nlemek m\u00fcmk\u00fcn olmasa da, al\u0131nabilecek baz\u0131 g\u00fcvenlik \u00f6nlemleri \u015funlard\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>G\u00fcncellemeleri ve yamalar\u0131 takip edin<\/strong>: Yaz\u0131l\u0131m ve i\u015fletim sisteminizi her zaman g\u00fcncel tutun.<\/li>\n\n\n\n<li><strong>G\u00fc\u00e7l\u00fc tehdit istihbarat\u0131 kullan\u0131n<\/strong>: SIEM (G\u00fcvenlik Bilgi ve Olay Y\u00f6netimi) ve XDR (Geni\u015fletilmi\u015f Tespit ve Yan\u0131t) gibi \u00e7\u00f6z\u00fcmler s\u0131f\u0131r g\u00fcn tehditlerini analiz edebilir.<\/li>\n\n\n\n<li><strong>Sald\u0131r\u0131 tespit ve \u00f6nleme sistemleri (IDS\/IPS) kullan\u0131n<\/strong>: A\u011f \u00fczerindeki anormal hareketleri tespit edebilir.<\/li>\n\n\n\n<li><strong>Uygulama g\u00fcvenli\u011fi testleri yap\u0131n<\/strong>: Penetrasyon testleri (Pentest) ile sisteminizi d\u00fczenli olarak kontrol edin.<\/li>\n\n\n\n<li><strong>\u015e\u00fcpheli dosya ve ba\u011flant\u0131lara kar\u015f\u0131 dikkatli olun<\/strong>: E-posta ekleri, sahte web siteleri ve bilinmeyen kaynaklardan gelen yaz\u0131l\u0131mlar\u0131 a\u00e7maktan ka\u00e7\u0131n\u0131n.<\/li>\n\n\n\n<li><strong>Sandbox ortam\u0131nda testler yap\u0131n<\/strong>: Bilinmeyen dosya ve yaz\u0131l\u0131mlar\u0131 g\u00fcvenli bir ortamda \u00e7al\u0131\u015ft\u0131rarak analiz edin.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sifir_Gun_Aciklari_Icin_Ornekler\"><\/span>S\u0131f\u0131r G\u00fcn A\u00e7\u0131klar\u0131 \u0130\u00e7in \u00d6rnekler<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Stuxnet (2010)<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u0130ran&#8217;\u0131n n\u00fckleer santrallerine sald\u0131rmak i\u00e7in kullan\u0131lan geli\u015fmi\u015f bir s\u0131f\u0131r g\u00fcn sald\u0131r\u0131s\u0131yd\u0131.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Microsoft Exchange Server A\u00e7\u0131\u011f\u0131 (2021)<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u00c7in destekli hacker gruplar\u0131 taraf\u0131ndan d\u00fcnya \u00e7ap\u0131nda binlerce \u015firkete sald\u0131r\u0131da kullan\u0131ld\u0131.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Log4Shell (2021)<\/strong>\n<ul class=\"wp-block-list\">\n<li>Apache Log4j k\u00fct\u00fcphanesindeki kritik bir g\u00fcvenlik a\u00e7\u0131\u011f\u0131, bir\u00e7ok b\u00fcy\u00fck \u015firketin etkilendi\u011fi b\u00fcy\u00fck \u00f6l\u00e7ekli bir tehditti.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Zoom A\u00e7\u0131\u011f\u0131 (2020)<\/strong>\n<ul class=\"wp-block-list\">\n<li>Zoom uygulamas\u0131nda ke\u015ffedilen bir a\u00e7\u0131k, kullan\u0131c\u0131lar\u0131n bilgisayarlar\u0131n\u0131n ele ge\u00e7irilmesine neden oluyordu.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sonuc\"><\/span>Sonu\u00e7<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>S\u0131f\u0131r g\u00fcn a\u00e7\u0131klar\u0131, siber g\u00fcvenlik d\u00fcnyas\u0131nda en tehlikeli tehditlerden biridir. Bu a\u00e7\u0131klar\u0131n istismar edilmesini \u00f6nlemek i\u00e7in g\u00fc\u00e7l\u00fc g\u00fcvenlik \u00f6nlemleri almak ve s\u00fcrekli g\u00fcncellenen bir siber g\u00fcvenlik politikas\u0131 olu\u015fturmak hayati \u00f6nem ta\u015f\u0131r. \u015eirketler ve bireyler, bilin\u00e7li g\u00fcvenlik uygulamalar\u0131 ile s\u0131f\u0131r g\u00fcn sald\u0131r\u0131lar\u0131na kar\u015f\u0131 daha diren\u00e7li hale gelebilir.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>S\u0131f\u0131r G\u00fcn A\u00e7\u0131\u011f\u0131 Nedir? S\u0131f\u0131r g\u00fcn a\u00e7\u0131\u011f\u0131 (Zero-Day Vulnerability), yaz\u0131l\u0131m,<a href=\"https:\/\/www.cenuta.com\/blog\/sifir-gun-aciklari-nedir-nasil-onlenir-ve-ornekleri-nelerdir\/\">&#8230;<\/a><\/p>\n","protected":false},"author":4,"featured_media":22786,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[],"class_list":["post-22788","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-terimler-sozlugu"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cenuta.com\/blog\/sifir-gun-aciklari-nedir-nasil-onlenir-ve-ornekleri-nelerdir\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"S\u0131f\u0131r G\u00fcn A\u00e7\u0131klar\u0131 Nedir? 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