{"id":3656,"date":"2023-10-09T17:19:54","date_gmt":"2023-10-09T14:19:54","guid":{"rendered":"https:\/\/uzmanposta.com\/blog\/?p=3656"},"modified":"2023-10-09T17:19:55","modified_gmt":"2023-10-09T14:19:55","slug":"waf-web-application-firewall","status":"publish","type":"post","link":"https:\/\/uzmanposta.com\/blog\/waf-web-application-firewall\/","title":{"rendered":"WAF (Web Application Firewall) Nedir? WAF T\u00fcrleri ve \u00d6zellikleri"},"content":{"rendered":"\n<p>Web uygulamalar\u0131na y\u00f6nelik siber sald\u0131r\u0131lar\u0131n artmas\u0131 uzun s\u00fcredir devam eden ve endi\u015fe verici bir e\u011filimdir. Bu y\u00fczden bir i\u015fletme olarak bu tehdidi ciddiye almak ve uygun g\u00fcvenlik \u00f6nlemlerini almak, b\u00fcy\u00fck \u00f6nem ta\u015f\u0131r.&nbsp;<\/p>\n\n\n\n<p>Bunun bir\u00e7ok nedeni vard\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Artan dijitalle\u015fme:<\/strong> \u0130\u015f d\u00fcnyas\u0131n\u0131n devam eden dijitalle\u015fmesi ve web uygulamalar\u0131 ile bulut tabanl\u0131 hizmetlerin giderek yayg\u0131nla\u015fmas\u0131, giderek daha fazla hassas verinin \u00e7evrimi\u00e7i olarak depolanmas\u0131na yol a\u00e7ar. Bu durum, bu verileri \u00e7alman\u0131n veya k\u00f6t\u00fcye kullanman\u0131n yollar\u0131n\u0131 arayan bilgisayar korsanlar\u0131n\u0131 cezbeder.<\/li><li><strong>Zay\u0131f g\u00fcvenlik \u00f6nlemleri:<\/strong> Bir\u00e7ok i\u015fletme web uygulamalar\u0131n\u0131n g\u00fcvenli\u011fini ihmal eder ve sa\u011flam g\u00fcvenlik \u00f6nlemleri geli\u015ftirmek ve uygulamak i\u00e7in yeterli kaynak ay\u0131rmaz. Bu da siber su\u00e7lular\u0131n uygulama a\u00e7\u0131klar\u0131ndan faydalanmas\u0131n\u0131 ve hassas bilgilere eri\u015fim sa\u011flamas\u0131n\u0131 kolayla\u015ft\u0131r\u0131r.<\/li><li><strong>Web uygulamalar\u0131n\u0131n karma\u015f\u0131kl\u0131\u011f\u0131: <\/strong>Modern web uygulamalar\u0131 \u00e7ok karma\u015f\u0131kt\u0131r ve birbirleriyle etkile\u015fim halinde olan \u00e7ok say\u0131da bile\u015fen i\u00e7erir. Bu da olas\u0131 t\u00fcm siber sald\u0131r\u0131 vekt\u00f6rlerinin tespit edilmesini ve g\u00fcvenli\u011finin sa\u011flanmas\u0131n\u0131 zorla\u015ft\u0131r\u0131r.<\/li><li><strong>Otomatik sald\u0131r\u0131lar:<\/strong> Siber su\u00e7lular, web uygulamalar\u0131ndaki g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 bulmak ve bunlardan yararlanmak i\u00e7in botlar ve komut dosyalar\u0131 gibi otomatik ara\u00e7lar\u0131 giderek daha fazla kullanmaktad\u0131r. Bu siber sald\u0131r\u0131lar \u00e7ok h\u0131zl\u0131 ve etkili olabilir, bu da tespit edilmelerini ve savunulmalar\u0131n\u0131 zorla\u015ft\u0131r\u0131r.<\/li><li><strong>Mobil cihazlar:<\/strong> Mobil cihazlar\u0131n yayg\u0131nla\u015fmas\u0131 ve mobil uygulamalar\u0131n kullan\u0131m\u0131ndaki art\u0131\u015f, mobil cihazlar arac\u0131l\u0131\u011f\u0131yla web uygulamalar\u0131nda giderek daha fazla veriye eri\u015filmesine yol a\u00e7m\u0131\u015ft\u0131r. Bu durum, siber su\u00e7lular\u0131n sald\u0131r\u0131lar\u0131n\u0131 mobil uygulamalara ve web uygulamalar\u0131na geni\u015fletmelerine yol a\u00e7m\u0131\u015ft\u0131r.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">WAF (Web Application Firewall) Nedir?<\/h2>\n\n\n\n<p>Web Application Firewall yani WAF, \u00f6zel bir uygulama seviyesi g\u00fcvenlik duvar\u0131 (ALF) t\u00fcr\u00fcd\u00fcr: web uygulamalar\u0131n\u0131 zararl\u0131 HTTP ve HTTPS trafi\u011finden korur. Bu, SQL veya komut dosyas\u0131 enjeksiyonu, siteler aras\u0131 komut dosyas\u0131 olu\u015fturma (XSS), arabellek ta\u015fmas\u0131, parametre kurcalama veya cookie poisoning yoluyla yap\u0131lan sald\u0131r\u0131lar\u0131 i\u00e7erir. Web uygulamas\u0131 g\u00fcvenlik duvar\u0131 yaln\u0131zca gelen trafi\u011fi de\u011fil, ayn\u0131 zamanda web sunucular\u0131 ve istemciler aras\u0131ndaki ileti\u015fimi de her iki y\u00f6nde analiz eder, filtreler ve engeller. Bu nedenle, yetkisiz verilerin web sunucusundan \u00e7\u0131kmas\u0131n\u0131 \u00f6nlemek i\u00e7in de yap\u0131land\u0131r\u0131labilir.<\/p>\n\n\n\n<p>Geleneksel bir g\u00fcvenlik duvar\u0131 <a href=\"https:\/\/uzmanposta.com\/blog\/osi-katmanlari\/\">OSI\/ISO modeline<\/a> g\u00f6re a\u011f ve aktar\u0131m seviyesindeki trafi\u011fi incelerken, web uygulamas\u0131 g\u00fcvenlik duvar\u0131 uygulama seviyesinde \u00e7al\u0131\u015f\u0131r. Bu nedenle di\u011fer g\u00fcvenlik duvar\u0131 t\u00fcrlerinin yerine ge\u00e7mez, daha ziyade bir tamamlay\u0131c\u0131d\u0131r. Di\u011fer g\u00fcvenlik duvarlar\u0131 gibi bir WAF da sunucu \u00fczerinde \u00e7al\u0131\u015fan bir yaz\u0131l\u0131m, bulut tabanl\u0131 veya hatta donan\u0131m tabanl\u0131 olabilir.\u00a0<\/p>\n\n\n\n<p>Bir web uygulamas\u0131 g\u00fcvenlik duvar\u0131, belirli IP adreslerini veya ba\u011flant\u0131 noktalar\u0131n\u0131 engellemekten daha fazlas\u0131n\u0131 yapmas\u0131 ve bir siber sald\u0131r\u0131 veya olas\u0131 enjeksiyon belirtileri arayan web trafi\u011finin derinliklerine inmesi a\u00e7\u0131s\u0131ndan geleneksel bir g\u00fcvenlik duvar\u0131ndan farkl\u0131d\u0131r.<\/p>\n\n\n\n<p>Ayr\u0131ca \u00f6zelle\u015ftirilebilir, farkl\u0131 uygulamalara \u00f6zg\u00fc bir\u00e7ok olas\u0131 kural\u0131 vard\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 vs G\u00fcvenlik Duvar\u0131<\/h2>\n\n\n\n<p>G\u00fcvenlik duvar\u0131, gelen verileri filtreleyerek bir bilgisayar a\u011f\u0131n\u0131 koruyan \u00fcr\u00fcn yaz\u0131l\u0131m\u0131 i\u00e7in kullan\u0131lan geni\u015f bir terimdir. Bu geni\u015f terimler i\u00e7inde, sa\u011flad\u0131klar\u0131 korumaya g\u00f6re farkl\u0131l\u0131k g\u00f6steren birka\u00e7 kategori vard\u0131r.<\/p>\n\n\n\n<p>Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 (WAF) ba\u015fka bir g\u00fcvenlik duvar\u0131 kategorisidir ve WAF&#8217;\u0131n \u00f6zellikle verileri nas\u0131l filtreledi\u011fiyle ay\u0131rt edilir.<\/p>\n\n\n\n<p>WAF, di\u011fer g\u00fcvenlik duvar\u0131 t\u00fcrlerinin bu t\u00fcr sald\u0131r\u0131lara kar\u015f\u0131 savunma yapamad\u0131\u011f\u0131 uygulama katman\u0131nda, yaln\u0131zca web tabanl\u0131 sald\u0131rganlara odaklanmas\u0131 bak\u0131m\u0131ndan benzersizdir. Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 (WAF) bir proxy g\u00fcvenlik duvar\u0131na benzer, ancak \u00f6zellikle katman 7 uygulama mant\u0131\u011f\u0131na odaklan\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 (WAF) Nas\u0131l \u00c7al\u0131\u015f\u0131r?<\/h2>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"984\" height=\"473\" src=\"https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2023\/09\/waf-nasil-calisir.png\" alt=\"Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 (WAF) Nas\u0131l \u00c7al\u0131\u015f\u0131r?\" class=\"wp-image-3681\" srcset=\"https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2023\/09\/waf-nasil-calisir.png 984w, https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2023\/09\/waf-nasil-calisir-300x144.png 300w, https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2023\/09\/waf-nasil-calisir-768x369.png 768w, https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2023\/09\/waf-nasil-calisir-750x361.png 750w\" sizes=\"(max-width: 984px) 100vw, 984px\" \/><figcaption>Kaynak: techtarget<\/figcaption><\/figure><\/div>\n\n\n\n<p>Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 (WAF), K\u00f6pr\u00fc Metni Aktar\u0131m Protokol\u00fc&#8217;nden (HTTP) gelen istekleri analiz eder ve hangi b\u00f6l\u00fcmlerin do\u011fru veya \u015f\u00fcpheli oldu\u011funu tan\u0131mlayan kurallar\u0131 uygular.<\/p>\n\n\n\n<p>WAF&#8217;\u0131n analiz etti\u011fi HTTP&#8217;nin ana b\u00f6l\u00fcmleri GET ve POST istekleridir. GET istekleri sunucudan veri almak i\u00e7in kullan\u0131l\u0131rken, POST istekleri sunucuya veri g\u00f6ndermek i\u00e7in kullan\u0131l\u0131r.<\/p>\n\n\n\n<p>WAF, HTTP&#8217;den gelen i\u00e7eri\u011fi analiz etmek ve filtrelemek i\u00e7in \u00fc\u00e7 yakla\u015f\u0131m kullan\u0131r. Bunlar a\u015fa\u011f\u0131daki \u015fekildedir:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Beyaz Liste&nbsp;<\/h3>\n\n\n\n<p>Beyaz liste, WAF&#8217;\u0131n varsay\u0131lan olarak t\u00fcm istekleri reddetti\u011fi ve yaln\u0131zca g\u00fcvenilen isteklere izin verdi\u011fi anlam\u0131na gelir. Beyaz liste, kara listeden daha basittir. Bununla birlikte, beyaz listenin dezavantaj\u0131, trafi\u011fi yanl\u0131\u015fl\u0131kla engelleme olas\u0131l\u0131\u011f\u0131d\u0131r. \u00c7ok verimli olabilmesine ra\u011fmen, beyaz listeleri kullanmak dezavantajlar da getirebilir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Kara Listeye Alma&nbsp;<\/h3>\n\n\n\n<p>Standart kara liste, zararl\u0131 web trafi\u011fini veya web uygulamalar\u0131n\u0131 engellemek i\u00e7in belirli varsay\u0131lanlar\u0131 kullan\u0131r. Basit\u00e7e s\u00f6ylemek gerekirse, kara listeye alma, bir tehlikeye i\u015faret edebilecek durumlarda belirli kurallar\u0131n kullan\u0131lmas\u0131d\u0131r.<\/p>\n\n\n\n<p>Kara listeye alma, bilinmeyen IP adreslerinden \u00e7ok fazla trafik al\u0131nd\u0131\u011f\u0131nda ve trafi\u011fin k\u00f6t\u00fc niyetli mi yoksa iyi mi oldu\u011fu bilinmedi\u011finde, genel web siteleri i\u00e7in daha uygundur.<\/p>\n\n\n\n<p>Kara listeye alman\u0131n dezavantajlar\u0131, kullan\u0131m i\u00e7in daha fazla \u00e7aba gerektirmesi ve belirli bilgilere dayal\u0131 verileri filtrelemek i\u00e7in daha fazla bilgiye ihtiya\u00e7 duyulmas\u0131d\u0131r.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Hibrit G\u00fcvenlik&nbsp;<\/h3>\n\n\n\n<p>Bu model hem beyaz liste hem de kara liste unsurlar\u0131n\u0131 kullan\u0131r.<\/p>\n\n\n\n<p>WAF i\u00e7in hangi modeli kullan\u0131rsan\u0131z kullan\u0131n, ama\u00e7, HTTP etkile\u015fimlerini analiz etmek ve k\u00f6t\u00fc niyetli trafi\u011fi sunucunuza ula\u015fmadan \u00f6nce yok etmektir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 Da\u011f\u0131t\u0131m Modlar\u0131<\/h2>\n\n\n\n<p>Web uygulamas\u0131 g\u00fcvenlik duvarlar\u0131n\u0131n genel olarak \u00fc\u00e7 da\u011f\u0131t\u0131m modu vard\u0131r. Bunlar a\u015fa\u011f\u0131daki \u015fekildedir:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Sat\u0131r i\u00e7i modu<\/h3>\n\n\n\n<p>Sat\u0131r i\u00e7i modu, WAF&#8217;\u0131n bir web sunucusu ile internet a\u011f ge\u00e7idi aras\u0131nda bulundu\u011fu yerdir. T\u00fcm trafik, a\u011f\u0131n ba\u015fka herhangi bir bile\u015fenine ula\u015fmadan \u00f6nce WAF&#8217;tan ge\u00e7mek zorundad\u0131r. Bu yakla\u015f\u0131m\u0131n avantaj\u0131, t\u00fcm isteklerin siber sald\u0131r\u0131lara kar\u015f\u0131 korunmas\u0131d\u0131r, ancak ek gecikme nedeniyle istemci taraf\u0131nda bir miktar performans etkisi olabilir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Sat\u0131r i\u00e7i olmayan mod<\/h3>\n\n\n\n<p>Sat\u0131r i\u00e7i olmayan mod, WAF&#8217;\u0131n mevcut bir web uygulama sunucusunun \u00f6n\u00fcnde oldu\u011fu, ancak onunla ayn\u0131 <a href=\"https:\/\/uzmanposta.com\/blog\/ip-nedir\/\">IP adresini<\/a> payla\u015fmad\u0131\u011f\u0131 yerdir. Buradaki avantaj, kullan\u0131c\u0131lar trafiklerini WAF olmayan IP adreslerine y\u00f6nlendirecekleri i\u00e7in performans etkilenmez, hem veri b\u00fct\u00fcnl\u00fc\u011f\u00fc hem de g\u00fcvenlik sorunlar\u0131 i\u00e7in tek bir noktadan koruma sa\u011flan\u0131r.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Hibrit mod<\/h3>\n\n\n\n<p>Hibrit mod, WAF&#8217;\u0131n mevcut bir web uygulama sunucusunun (\u00f6rne\u011fin Apache HTTPd) \u00f6n\u00fcnde oldu\u011fu ancak onunla ayn\u0131 IP adresini payla\u015ft\u0131\u011f\u0131 yerdir. Normal trafi\u011fi olumsuz etkilemeden performans ve b\u00fct\u00fcnl\u00fck konusunda botlara veya otomatik sald\u0131r\u0131lara kar\u015f\u0131 koruma sa\u011flar.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 Ne \u0130\u015fe Yarar?<\/h2>\n\n\n\n<p>Web uygulamas\u0131 g\u00fcvenlik duvar\u0131 (WAF), web uygulamalar\u0131n\u0131 K\u00f6pr\u00fc Metni Aktar\u0131m Protokol\u00fc (HTTP\/HTTPS) \u00fczerinden gelen sald\u0131r\u0131lara kar\u015f\u0131 koruyan bir prosed\u00fcrd\u00fcr. Bu nedenle uygulama d\u00fczeyinde g\u00fcvenlik duvar\u0131n\u0131n (ALF) \u00f6zel bir durumudur.<\/p>\n\n\n\n<p>Klasik g\u00fcvenlik duvarlar\u0131n\u0131n aksine bir WAF ileti\u015fimi uygulama d\u00fczeyinde inceler. Gelen t\u00fcm istekler ve web sunucusunun yan\u0131tlar\u0131 WAF taraf\u0131ndan incelenir. \u015e\u00fcpheli i\u00e7erik tespit edilirse, eri\u015fim reddedilir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 (WAF) T\u00fcrleri<\/h2>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"1000\" height=\"500\" src=\"https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2023\/09\/web-application-firewall-waf-turleri.jpeg\" alt=\"\" class=\"wp-image-3684\" srcset=\"https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2023\/09\/web-application-firewall-waf-turleri.jpeg 1000w, https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2023\/09\/web-application-firewall-waf-turleri-300x150.jpeg 300w, https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2023\/09\/web-application-firewall-waf-turleri-768x384.jpeg 768w, https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2023\/09\/web-application-firewall-waf-turleri-360x180.jpeg 360w, https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2023\/09\/web-application-firewall-waf-turleri-750x375.jpeg 750w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><\/div>\n\n\n\n<p><strong>A\u011f tabanl\u0131 WAF<\/strong>&#8216;lar genellikle donan\u0131m tabanl\u0131d\u0131r ve yerel olarak ve uygulamalara yak\u0131n bir yere kurularak gecikme s\u00fcresini azaltabilir. \u00c7o\u011fu a\u011f tabanl\u0131 WAF sat\u0131c\u0131s\u0131, kurallar\u0131n ve ayarlar\u0131n cihazlar\u0131nda \u00e7o\u011falt\u0131lmas\u0131na izin vererek kullan\u0131c\u0131lar\u0131n b\u00fcy\u00fck \u00f6l\u00e7ekte da\u011f\u0131t\u0131m ve yap\u0131land\u0131rma yapmas\u0131na olanak tan\u0131r. A\u011f tabanl\u0131 WAF&#8217;\u0131n dezavantaj\u0131 ise maliyettir.<\/p>\n\n\n\n<p><strong>Ana bilgisayar tabanl\u0131 WAF,<\/strong> uygulama kodunun kendisine tamamen entegre edilebilir. Ana bilgisayar tabanl\u0131 WAF uygulaman\u0131n avantajlar\u0131 d\u00fc\u015f\u00fck maliyet ve \u00f6zelle\u015ftirme kolayl\u0131\u011f\u0131d\u0131r. Ancak, bu t\u00fcr bir uygulama k\u00fct\u00fcphanesi gerektirdi\u011finden ve etkili bir \u015fekilde \u00e7al\u0131\u015fmas\u0131 i\u00e7in yerel bir sunucuya dayand\u0131\u011f\u0131ndan zor olabilir. Bu nedenle, geli\u015ftiriciler, sistem analistleri ve muhtemelen DevOps \/ DevSecOps dahil olmak \u00fczere daha fazla personele ihtiya\u00e7 duyulur.<\/p>\n\n\n\n<p><strong>Bulut tabanl\u0131 WAF<\/strong>, web uygulamas\u0131 g\u00fcvenlik duvar\u0131n\u0131 (WAF) y\u00f6netmek i\u00e7in minimum kayna\u011fa ihtiya\u00e7 duyan i\u015fletmeler i\u00e7in daha uygun maliyetli bir \u00e7\u00f6z\u00fcm sunar. Bulut WAF&#8217;\u0131n kurulumu daha kolayd\u0131r ve kullan\u0131m veya abonelik temelinde kullan\u0131labilir.<\/p>\n\n\n\n<p>Bazen uygulama trafi\u011fini yeniden y\u00f6nlendirmek i\u00e7in yaln\u0131zca basit bir alan ad\u0131 sistemi veya proxy de\u011fi\u015fikli\u011fi gerekir. \u0130\u015fletmenizin trafi\u011fini \u00fc\u00e7\u00fcnc\u00fc taraflara, yani WAF sa\u011flay\u0131c\u0131lar\u0131na emanet etmek zorunda kalmak sizi endi\u015felendirse de, bu y\u00f6ntem uygulaman\u0131z\u0131 \u00e7ok \u00e7e\u015fitli bar\u0131nd\u0131rma konumlar\u0131nda koruman\u0131za olanak tan\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131\u2019n\u0131n (WAF) Avantajlar\u0131<\/h2>\n\n\n\n<p>Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 (WAF), HTTP katman\u0131ndan gelen hassas verilerin daha iyi g\u00f6r\u00fcn\u00fcrl\u00fc\u011f\u00fcn\u00fc sa\u011flayarak di\u011fer geleneksel g\u00fcvenlik duvarlar\u0131na g\u00f6re bir\u00e7ok avantaj sa\u011flar.&nbsp;<\/p>\n\n\n\n<p>WAF, normalde geleneksel g\u00fcvenlik duvarlar\u0131n\u0131 a\u015fabilecek uygulama katman\u0131 siber sald\u0131r\u0131lar\u0131n\u0131 \u00f6nleyebilir.<\/p>\n\n\n\n<p>Sald\u0131r\u0131 Siteler aras\u0131 komut dosyas\u0131 olu\u015fturma (XSS), bilgisayar korsanlar\u0131n\u0131n ba\u015fka bir kullan\u0131c\u0131n\u0131n taray\u0131c\u0131s\u0131na k\u00f6t\u00fc ama\u00e7l\u0131 komut dosyalar\u0131 enjekte etmesine ve y\u00fcr\u00fctmesine olanak tan\u0131r.<\/p>\n\n\n\n<p>SQL (Yap\u0131land\u0131r\u0131lm\u0131\u015f Sorgu Dili) sald\u0131r\u0131s\u0131, SQL veri taban\u0131 kullanan herhangi bir uygulamay\u0131 tehlikeye atabilir ve bilgisayar korsanlar\u0131n\u0131n hassas verilere eri\u015fmesine ve potansiyel olarak de\u011fi\u015ftirmesine izin verebilir.<\/p>\n\n\n\n<p>Taray\u0131c\u0131 korsanl\u0131\u011f\u0131, bilgisayar korsanlar\u0131n\u0131n bir oturum kimli\u011fini ele ge\u00e7irmesine ve yetkili bir kullan\u0131c\u0131y\u0131 taklit etmesine olanak tan\u0131yabilir. Oturum kimli\u011fi genellikle bir \u00e7erezde veya Tekd\u00fczen Kaynak Konum Belirleyicide (URL) saklan\u0131r.<\/p>\n\n\n\n<p>Da\u011f\u0131t\u0131lm\u0131\u015f hizmet reddi (DDoS) sald\u0131r\u0131s\u0131, bir a\u011f\u0131 kullan\u0131c\u0131lara hizmet veremeyecek kadar trafikle dolu hale getirebilir. Hem g\u00fcvenlik duvar\u0131 hem de WAF a\u011flar\u0131 bu t\u00fcr siber sald\u0131r\u0131lar\u0131 kontrol edebilir, ancak bunu farkl\u0131 \u015fekilde yaparlar.<\/p>\n\n\n\n<p>Yukar\u0131daki avantajlara ek olarak, Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 (WAF), kaynak koduna eri\u015fmek zorunda kalmadan web tabanl\u0131 uygulamalar\u0131 da koruyabilir.<\/p>\n\n\n\n<p>Ana bilgisayar tabanl\u0131 WAF uygulama koduna entegre edilmi\u015f olsa da, bulutta bar\u0131nd\u0131r\u0131lan bir Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 (WAF) uygulamalar\u0131 eri\u015fim olmadan koruyabilir.<\/p>\n\n\n\n<p>Buna ek olarak, Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 (WAF) bulutunun da\u011f\u0131t\u0131m\u0131 ve kurulumu da kolayd\u0131r ve kullan\u0131c\u0131lar\u0131n yeni siber sald\u0131r\u0131lara uyum sa\u011flamak i\u00e7in ayarlar\u0131 h\u0131zla de\u011fi\u015ftirmesine olanak tan\u0131r.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Uygulamalara yetkisiz eri\u015fimi engelleyerek k\u00f6t\u00fc niyetli sald\u0131r\u0131lara kar\u015f\u0131 koruma sa\u011flar.<\/li><li>Web Uygulamas\u0131 G\u00fcvenlik Duvarlar\u0131, a\u011f ortam\u0131n\u0131z\u0131 g\u00fcvence alt\u0131na almak i\u00e7in uygun maliyetli bir yoldur.<\/li><li>WAF, mevcut altyap\u0131 veya uygulamalarda herhangi bir de\u011fi\u015fiklik gerektirmez, bu nedenle bir tane kurarken kesinti s\u00fcresine gerek yoktur.<\/li><li>\u0130\u015fletmenizin verilerini ve itibar\u0131n\u0131 korur.<\/li><li>Web Uygulamas\u0131 G\u00fcvenlik Duvarlar\u0131, izinsiz giri\u015f \u00f6nleme sistemleri, antivir\u00fcs yaz\u0131l\u0131m\u0131 ve daha fazlas\u0131 gibi di\u011fer g\u00fcvenlik \u00f6nlemleriyle birlikte kullan\u0131labilir.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">WAF Da\u011f\u0131t\u0131m\u0131nda Kar\u015f\u0131la\u015f\u0131lan Zorluklar<\/h2>\n\n\n\n<p>Bir Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 kurarken kar\u015f\u0131la\u015f\u0131lan en b\u00fcy\u00fck zorluk, ortam\u0131n\u0131z i\u00e7in hangi \u00f6zelliklerin gerekli oldu\u011funu belirlemektir. Baz\u0131 i\u015fletmeler yukar\u0131da a\u00e7\u0131klad\u0131\u011f\u0131m\u0131z t\u00fcm siber sald\u0131r\u0131lardan korunmaya ihtiya\u00e7 duymaz, bu nedenle bir i\u015fletmenin yaln\u0131zca k\u00f6t\u00fc ama\u00e7l\u0131 kod veya SQL enjeksiyonuna kar\u015f\u0131 korunmas\u0131 gerekebilir. Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 sat\u0131c\u0131lar\u0131 genellikle bu tehditlerin baz\u0131lar\u0131na kar\u015f\u0131 koruma sa\u011flayacak bir \u00e7\u00f6z\u00fcme sahipken, baz\u0131lar\u0131 ise i\u015fletmelerin g\u00fcn\u00fcm\u00fczde kar\u015f\u0131la\u015ft\u0131\u011f\u0131 dijital tehlikelerin \u00e7o\u011funa kar\u015f\u0131 koruma sa\u011flayan kapsaml\u0131 bir savunma plan\u0131 sunar.<\/p>\n\n\n\n<p>Web Uygulamas\u0131 G\u00fcvenlik Duvarlar\u0131, korunan uygulamalar\u0131n performans\u0131 \u00fczerinde de olumsuz bir etkiye sahip olabilir. Bir WAF veri yolundaki ba\u015fka bir noktad\u0131r, bu nedenle t\u00fcm g\u00fcvenlik cihazlar\u0131nda oldu\u011fu gibi bir t\u00fcr maliyet s\u00f6z konusudur. Bu maliyet genellikle kullan\u0131c\u0131lar i\u00e7in artan gecikme s\u00fcresi olarak kendini g\u00f6sterir.&nbsp;<\/p>\n\n\n\n<p>Bir di\u011fer potansiyel sorun ise karma\u015f\u0131kl\u0131kt\u0131r. Bir kez kurulduktan sonra, sald\u0131r\u0131 mekanizmalar\u0131 daha karma\u015f\u0131k hale gelir ve dolay\u0131s\u0131yla y\u00f6netilmesi ve bak\u0131m\u0131 daha zor olur.&nbsp; Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 sa\u011flay\u0131c\u0131lar\u0131, m\u00fc\u015fterilerinin hangi siber sald\u0131r\u0131larla kar\u015f\u0131la\u015ft\u0131\u011f\u0131n\u0131 bilirlerse genellikle size daha iyi koruma sa\u011flar. Bu nedenle, uygun koruma mekanizmalar\u0131na karar veren tehditleri analiz etme ve bunlar\u0131 ortam\u0131n\u0131zda nas\u0131l kullanaca\u011f\u0131n\u0131z konusunda onlarla yak\u0131n bir \u015fekilde \u00e7al\u0131\u015fman\u0131z \u00f6nerilir.<\/p>\n\n\n\n<p>Karar\u0131n\u0131zda \u00f6nemli bir fakt\u00f6r olabilece\u011finden, pazar\u0131n olgunlu\u011funu da g\u00f6z \u00f6n\u00fcnde bulundurman\u0131z gerekir. Sat\u0131c\u0131lar, \u00fcretime ge\u00e7tiklerinde WAF \u00e7\u00f6z\u00fcm\u00fcyle ilgili herhangi bir g\u00fcvenlik a\u00e7\u0131\u011f\u0131 veya sorun olmas\u0131 halinde sizi destekleyecek k\u00f6kl\u00fc bir destek yap\u0131s\u0131na sahip olmal\u0131d\u0131r. Ayr\u0131ca, da\u011f\u0131t\u0131m s\u0131ras\u0131nda sat\u0131c\u0131n\u0131zla yak\u0131n bir \u015fekilde \u00e7al\u0131\u015f\u0131n ve hangi \u00f6zellikleri sunduklar\u0131na dair t\u00fcm ilgili bilgileri almaya \u00e7al\u0131\u015f\u0131n, b\u00f6ylece ihtiyac\u0131n\u0131z olmayan \u015feyler i\u00e7in \u00f6deme yaparak para harcamak zorunda kalmazs\u0131n\u0131z.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">WAF Hangi Tehditlere Kar\u015f\u0131 Koruma Sa\u011flar?<\/h2>\n\n\n\n<p>Web uygulamas\u0131 g\u00fcvenlik duvar\u0131 a\u011f trafi\u011fini uygulama d\u00fczeyinde analiz etti\u011finden, baz\u0131lar\u0131n\u0131n tespit edilmesi zor olan bir\u00e7ok farkl\u0131 siber sald\u0131r\u0131y\u0131 belirleyebilir ve engelleyebilir. Bunlar aras\u0131nda zararl\u0131 verilerin, komutlar\u0131n ve isteklerin sisteme enjekte edildi\u011fi farkl\u0131 t\u00fcrde enjeksiyon ve siteler aras\u0131 sald\u0131r\u0131lar yer al\u0131r. Ayr\u0131ca, istemeden payla\u015f\u0131lan dosyalara eri\u015fim ve \u00e7erezlerin manip\u00fclasyonu \u00f6nlenerek veri ve kimlik h\u0131rs\u0131zl\u0131\u011f\u0131 engellenebilir. Bir\u00e7ok WAF etkile\u015fimli bir \u00f6\u011frenme modunu destekler. Y\u00f6neticilerin yard\u0131m\u0131yla, istenen ve izin verilen istekleri potansiyel olarak tehlikeli ve yetkisiz eri\u015fimden ay\u0131rt etmeyi \u00f6\u011frenirler. Bu \u015fekilde, manip\u00fcle edilmi\u015f form verilerinden, programlama hatalar\u0131ndan ve web uygulamas\u0131ndaki, istemci programlar\u0131ndaki ve sunucudaki g\u00fcvenlik a\u00e7\u0131klar\u0131ndan kaynaklanan yeni tehlikeleri tan\u0131rlar. Bununla birlikte, kapsaml\u0131 istemci taraf\u0131 JavaScript programlama i\u00e7eren web uygulamalar\u0131 yaln\u0131zca s\u0131n\u0131rl\u0131 \u00f6l\u00e7\u00fcde korunabilir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 Kullan\u0131rken Nelere Dikkat Edilmelidir?<\/h2>\n\n\n\n<p>S\u0131radan bir paket filtreli g\u00fcvenlik duvar\u0131n\u0131n olduk\u00e7a basit kurallar\u0131yla kar\u015f\u0131la\u015ft\u0131r\u0131ld\u0131\u011f\u0131nda, bir WAF&#8217;\u0131n filtre sistemleri karma\u015f\u0131k ve \u00e7e\u015fitli olabilir. Kurulum ve bak\u0131m, teknik bir y\u00f6netim gerektirir. Y\u00f6netim do\u011fru yap\u0131lmazsa, hatal\u0131 veya a\u015f\u0131r\u0131 kat\u0131 politikalar nedeniyle ar\u0131zalar meydana gelebilir. Bir WAF k\u00f6t\u00fc yaz\u0131lm\u0131\u015f web uygulamalar\u0131ndaki hatalara kar\u015f\u0131 koruma sa\u011flayabilse bile, g\u00fcvenlik bilincine sahip yaz\u0131l\u0131m geli\u015ftirmenin yerine kullan\u0131lmamal\u0131d\u0131r. Ayn\u0131 durum, hen\u00fcz d\u00fczeltilmemi\u015f ve m\u00fcmk\u00fcn oldu\u011funca h\u0131zl\u0131 bir \u015fekilde ortadan kald\u0131r\u0131lmaya devam edilmesi gereken g\u00fcvenlik s\u0131z\u0131nt\u0131lar\u0131 i\u00e7in ge\u00e7ici bir \u00e7\u00f6z\u00fcm olarak ge\u00e7ici kullan\u0131m i\u00e7in de ge\u00e7erlidir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">WAF \u0130le \u0130lgili En \u00c7ok Sorulan Sorular<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. WAF&#8217;\u0131n durdurmak i\u00e7in tasarland\u0131\u011f\u0131 siber sald\u0131r\u0131 t\u00fcrleri nelerdir?<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>K\u00f6t\u00fc Ama\u00e7l\u0131 Yaz\u0131l\u0131m<\/li><li>S\u0131f\u0131r\u0131nc\u0131 G\u00fcn Sald\u0131r\u0131lar\u0131<\/li><li>SQL Enjeksiyon Sald\u0131r\u0131lar\u0131<\/li><li>Defacements<\/li><li>Siteler Aras\u0131 Komut Dosyas\u0131 (XSS) Sald\u0131r\u0131lar\u0131<\/li><li>DDoS Sald\u0131r\u0131lar\u0131<\/li><li>Business Logic Attacks<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Bir WAF nas\u0131l devre d\u0131\u015f\u0131 b\u0131rak\u0131l\u0131r?<\/h3>\n\n\n\n<p>Bir WAF&#8217;\u0131 devre d\u0131\u015f\u0131 b\u0131rakmak m\u00fcmk\u00fcn olsa da \u00f6nerilmez. WAF&#8217;\u0131n\u0131z\u0131 devre d\u0131\u015f\u0131 b\u0131rak\u0131rsan\u0131z (test amac\u0131yla), web uygulaman\u0131zdan ge\u00e7en trafi\u011fin, istekleri bir bilgisayar korsan\u0131n\u0131n g\u00fcvenlik a\u00e7\u0131\u011f\u0131ndan yararlanmaya \u00e7al\u0131\u015fabilece\u011fi dahili sunuculara y\u00f6nlendirebilecek herhangi bir y\u00fck dengeleyici veya proxy sunucusu \u00fczerinden g\u00f6nderilmedi\u011finden emin olman\u0131z gerekir. Aksi takdirde, Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 yerine bir IDS\/IPS \u00e7\u00f6z\u00fcm\u00fcn\u00fcn faydalar\u0131n\u0131 g\u00f6r\u00fcrken uygulaman\u0131z\u0131 istemeden harici siber sald\u0131r\u0131lara maruz b\u0131rakabilirsiniz.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Bir WAF anti-vir\u00fcs \u00e7\u00f6z\u00fcmleriyle nas\u0131l \u00e7al\u0131\u015f\u0131r?<\/h3>\n\n\n\n<p>Bir g\u00fcvenlik \u00e7\u00f6z\u00fcm\u00fc di\u011fer g\u00fcvenlik \u00e7\u00f6z\u00fcmlerini tamamlamal\u0131 ve daha da \u00f6nemlisi siber g\u00fcvenli\u011fin farkl\u0131 y\u00f6nlerini ele almal\u0131d\u0131r. Bir antivir\u00fcs b\u00fcy\u00fck olas\u0131l\u0131kla a\u011f d\u00fczeyinde koruma sa\u011flar, ancak istemci makinelere da\u011f\u0131t\u0131lan bir u\u00e7 nokta \u00e7\u00f6z\u00fcm\u00fc olarak da kullan\u0131labilir ve imza tabanl\u0131 veya davran\u0131\u015f tabanl\u0131 olabilir. Bir Web Uygulamas\u0131 G\u00fcvenlik Duvar\u0131 b\u00fcy\u00fck olas\u0131l\u0131kla bilgisayarlardan ziyade uygulamalar\u0131 web sald\u0131r\u0131lar\u0131na kar\u015f\u0131 korur, ancak bir uygulaman\u0131n kodundaki g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 tespit etmek i\u00e7in imzalar\u0131 da kullanabilir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. Bir WAF SSL ile nas\u0131l \u00e7al\u0131\u015f\u0131r?<\/h3>\n\n\n\n<p>Bir WAF, istemci ve sunucular aras\u0131ndaki trafi\u011fi inceler, bu nedenle bir web g\u00fcvenlik a\u00e7\u0131\u011f\u0131ndan yararlanmaya \u00e7al\u0131\u015fan bir bilgisayar korsan\u0131n\u0131n k\u00f6t\u00fc niyetli faaliyetlerini tespit etmek i\u00e7in kullan\u0131lan mant\u0131k s\u00f6z konusu oldu\u011funda HTTPS \u00f6nemsizdir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5. Web uygulamas\u0131 g\u00fcvenlik duvarlar\u0131n\u0131n siber sald\u0131r\u0131lar\u0131 tespit etmek i\u00e7in kulland\u0131\u011f\u0131 en yayg\u0131n teknik nedir?<\/h3>\n\n\n\n<p>Web Uygulamas\u0131 G\u00fcvenlik Duvarlar\u0131 taraf\u0131ndan kullan\u0131lan en yayg\u0131n teknikler, web sald\u0131r\u0131lar\u0131n\u0131n imza tabanl\u0131 veya kural tabanl\u0131 tespitidir. \u0130mza tabanl\u0131 alg\u0131lama, bir WAF&#8217;\u0131n trafi\u011fi inceledi\u011fi ve belirli bir dizeyle kar\u015f\u0131la\u015ft\u0131rd\u0131\u011f\u0131 anlam\u0131na gelirken, kural tabanl\u0131 alg\u0131lama, bir WAF&#8217;\u0131n trafi\u011fi beyaz listeler \/ kara listeler olabilecek kurallara g\u00f6re inceledi\u011fi, i\u015f mant\u0131\u011f\u0131na g\u00f6re kriterleri e\u015fle\u015ftirdi\u011fi, eri\u015fim kontrolleri sa\u011flad\u0131\u011f\u0131 vb. anlam\u0131na gelir.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p><strong>\u0130lgili \u0130\u00e7erikler<\/strong>:<\/p>\n\n\n\n<p><a href=\"https:\/\/uzmanposta.com\/blog\/firewall-nedir\/\">Firewall Nedir, Ne \u0130\u015fe Yarar? Firewall T\u00fcrleri<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Web uygulamalar\u0131na y\u00f6nelik siber sald\u0131r\u0131lar\u0131n artmas\u0131 uzun s\u00fcredir devam eden ve endi\u015fe verici bir e\u011filimdir. Bu y\u00fczden bir i\u015fletme olarak bu tehdidi ciddiye almak ve uygun g\u00fcvenlik \u00f6nlemlerini almak, b\u00fcy\u00fck \u00f6nem ta\u015f\u0131r.&nbsp; Bunun bir\u00e7ok nedeni vard\u0131r: Artan dijitalle\u015fme: \u0130\u015f d\u00fcnyas\u0131n\u0131n devam eden dijitalle\u015fmesi ve web uygulamalar\u0131 ile bulut tabanl\u0131 hizmetlerin giderek yayg\u0131nla\u015fmas\u0131, giderek daha fazla [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":3682,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3656","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nedir-nasil-yapilir"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>WAF (Web Application Firewall) Nedir? 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Bu y\u00fczden bir i\u015fletme olarak bu tehdidi ciddiye almak ve uygun g\u00fcvenlik \u00f6nlemlerini almak, b\u00fcy\u00fck \u00f6nem ta\u015f\u0131r.&nbsp; Bunun bir\u00e7ok nedeni vard\u0131r: Artan dijitalle\u015fme: \u0130\u015f d\u00fcnyas\u0131n\u0131n devam eden dijitalle\u015fmesi ve web uygulamalar\u0131 ile bulut tabanl\u0131 hizmetlerin giderek yayg\u0131nla\u015fmas\u0131, giderek daha fazla [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/uzmanposta.com\/blog\/waf-web-application-firewall\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/uzmanposta\/\" \/>\n<meta property=\"article:published_time\" content=\"2023-10-09T14:19:54+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-10-09T14:19:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/uzmanposta.com\/blog\/wp-content\/uploads\/2023\/09\/waf-web-application-firewall-nedir-waf-turleri-ve-ozellikleri.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"500\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Sibel Ho\u015f\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@uZmanPosta\" \/>\n<meta name=\"twitter:site\" content=\"@uZmanPosta\" \/>\n<meta name=\"twitter:label1\" content=\"Yazan:\" \/>\n\t<meta name=\"twitter:data1\" content=\"Sibel Ho\u015f\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tahmini okuma s\u00fcresi\" \/>\n\t<meta name=\"twitter:data2\" content=\"14 dakika\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"WAF (Web Application Firewall) Nedir? 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