“S\u0131f\u0131r G\u00fcn” terimi, g\u00fcvenlik a\u00e7\u0131\u011f\u0131n\u0131n yaz\u0131l\u0131m sat\u0131c\u0131s\u0131 taraf\u0131ndan tam olarak s\u0131f\u0131r g\u00fcnd\u00fcr biliniyor olmas\u0131 ve bir d\u00fczeltme eki veya g\u00fcncelleme \u00fczerinde \u00e7al\u0131\u015f\u0131lmas\u0131 i\u00e7in “0” g\u00fcn\u00fcn oldu\u011fu ger\u00e7e\u011fine at\u0131fta bulunur. \u00c7\u00fcnk\u00fc geli\u015ftiriciler sorunu \u00e7\u00f6zme \u015fans\u0131 bulamadan, sald\u0131rganlar\u0131n kusurdan yararlanmas\u0131 s\u00f6z konusudur. Hatta \u00e7o\u011fu zaman geli\u015ftiriciler sald\u0131r\u0131 ger\u00e7ekle\u015fene kadar zay\u0131f noktan\u0131n fark\u0131nda de\u011fildir.<\/p>\n\n\n\n
“S\u0131f\u0131r G\u00fcn” ile ilgili s\u0131k kullan\u0131lan \u00fc\u00e7 terimi a\u00e7\u0131klamak bu sald\u0131r\u0131lar\u0131n ya\u015fam d\u00f6ng\u00fcs\u00fcn\u00fc kavraman\u0131za yard\u0131mc\u0131 olacakt\u0131r.<\/p>\n\n\n\n
Zero Day Vulnerability<\/strong> S\u0131f\u0131r G\u00fcn G\u00fcvenlik A\u00e7\u0131\u011f\u0131<\/strong><\/h2>\n\n\n\n
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S\u0131f\u0131r g\u00fcn g\u00fcvenlik a\u00e7\u0131\u011f\u0131, bir programlama hatas\u0131ndan veya yanl\u0131\u015f yap\u0131land\u0131rmadan kaynaklanan ve hen\u00fcz d\u00fczeltme eki bulunmayan yaz\u0131l\u0131m veya donan\u0131m kusurudur.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Zero Day Exploit<\/strong> S\u0131f\u0131r G\u00fcn \u0130stismar\u0131<\/strong><\/h2>\n\n\n\n
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S\u0131f\u0131r g\u00fcn istismar\u0131, siber korsanlar\u0131n\u0131n \u00f6nceden tan\u0131mlanamayan bir g\u00fcvenlik a\u00e7\u0131\u011f\u0131na sahip sistemlere sald\u0131rmak i\u00e7in kulland\u0131klar\u0131 teknik veya taktiktir.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Zero Day Attack<\/strong> S\u0131f\u0131r G\u00fcn Sald\u0131r\u0131s\u0131<\/strong><\/h2>\n\n\n\n
G\u00fcvenlik a\u00e7\u0131klar\u0131 olas\u0131 bir sald\u0131r\u0131ya giden yolu temsil eder ve sald\u0131r\u0131y\u0131 ger\u00e7ekle\u015ftirmek i\u00e7in \u00f6nemli bir ara\u00e7t\u0131r. Tespit edilmeleri zordur ve g\u00fcnler, aylar hatta bazen y\u0131llar boyunca fark edilmeyebilirler. Siber korsanlar bu yolu kullanarak kullan\u0131c\u0131 kimliklerini ve \u015fifreleri ele ge\u00e7irebilir, sisteme k\u00f6t\u00fc ama\u00e7l\u0131 yaz\u0131l\u0131m enjekte edebilir, hassas verileri g\u00f6r\u00fcnt\u00fcleyebilir ve s\u0131zd\u0131rabilir. <\/p>\n\n\n\n
S\u0131f\u0131r G\u00fcn Sald\u0131r\u0131lar\u0131 Hangi G\u00fcvenlik A\u00e7\u0131klar\u0131ndan Yararlan\u0131r?<\/h2>\n\n\n\n
Fark edildiklerinde haz\u0131r yamalar mevcut olmad\u0131\u011f\u0131ndan s\u0131f\u0131r g\u00fcn g\u00fcvenlik a\u00e7\u0131klar\u0131, siber korsanlara ihtiya\u00e7 duyduklar\u0131 s\u00fcreyi tan\u0131malar\u0131 ile \u00fcnl\u00fcd\u00fcr.<\/figcaption><\/figure><\/div>\n\n\n\n
S\u0131f\u0131r g\u00fcn g\u00fcvenlik a\u00e7\u0131klar\u0131, eksik veri \u015fifreleme, eksik yetkilendirmeler, bozuk algoritmalar, hatalar, parola g\u00fcvenli\u011fi ile ilgili sorunlar gibi \u00e7e\u015fitli bi\u00e7imlerde olabilece\u011finden, tespit edilmeleri kolay de\u011fildir. <\/p>\n\n\n\n
S\u0131f\u0131r\u0131nc\u0131 g\u00fcn istismarlar\u0131 i\u00e7in en pop\u00fcler sald\u0131r\u0131 vekt\u00f6rleri, web taray\u0131c\u0131lar\u0131 gibi yayg\u0131n olarak kullan\u0131lan programlar, Word, Excel veya PDF dosyalar\u0131 gibi pop\u00fcler dosya t\u00fcrleri ve bunlar\u0131 i\u015fleyen programlard\u0131r. T\u00fcm zaman\u0131n\u0131 s\u0131f\u0131r g\u00fcn istismar\u0131 yaratmak i\u00e7in harcamaya g\u00f6n\u00fcll\u00fc olan korsanlar, neredeyse herkesin kulland\u0131\u011f\u0131 programlar\u0131, yaz\u0131l\u0131mlar\u0131 hedeflemeyi makul bulmaktad\u0131r.<\/p>\n\n\n\n
Sald\u0131rganlar a\u015fa\u011f\u0131dakiler de dahil olmak \u00fczere \u00e7e\u015fitli sistemlerdeki g\u00fcvenlik a\u00e7\u0131klar\u0131ndan yararlanabilir:<\/p>\n\n\n\n
Ulusal g\u00fcvenlikle ilgili bilgilere veya de\u011ferli ticari s\u0131rlara eri\u015fimi olan kurulu\u015flar\u0131n potansiyel kurban listesinin ba\u015f\u0131nda yer ald\u0131\u011f\u0131n\u0131 tahmin edebilirsiniz. \u0130hlal edilen bilgi ne kadar hassas olursa, s\u0131f\u0131r g\u00fcn sald\u0131r\u0131s\u0131 o kadar fazla hasar verecektir. Hastalar i\u00e7in hassas t\u0131bbi verileri ve finansal bilgileri bar\u0131nd\u0131ran sa\u011fl\u0131k sistemleri de bu t\u00fcr sald\u0131r\u0131lar a\u00e7\u0131s\u0131ndan cazip hedefler aras\u0131ndad\u0131r. <\/p>\n\n\n\n
Kritik i\u015f verilerine eri\u015fimi olan ki\u015filer, b\u00fcy\u00fck i\u015fletmeler ve kurulu\u015flar, devlet kurumlar\u0131 ve siyasi hedefler Zero Day sald\u0131r\u0131lar\u0131n\u0131n potansiyel kurbanlar\u0131 aras\u0131nda say\u0131labilir.<\/p>\n\n\n\n
Hedefli s\u0131f\u0131r\u0131nc\u0131 g\u00fcn sald\u0131r\u0131lar\u0131, b\u00fcy\u00fck kurumlara veya y\u00fcksek profilli ki\u015filere y\u00f6neltilirken hedeflenmemi\u015f s\u0131f\u0131r\u0131nc\u0131 g\u00fcn sald\u0131r\u0131lar\u0131 genellikle i\u015fletim sistemi veya taray\u0131c\u0131 gibi savunmas\u0131z sistemlerin kullan\u0131c\u0131lar\u0131na kar\u015f\u0131 yap\u0131l\u0131r ve m\u00fcmk\u00fcn oldu\u011fu kadar \u00e7ok kullan\u0131c\u0131y\u0131 yakalamay\u0131 ama\u00e7lar. <\/p>\n\n\n\n
Taray\u0131c\u0131 veya i\u015fletim sistemlerindeki g\u00fcvenlik a\u00e7\u0131klar\u0131 korsanlar\u0131n, b\u00fcy\u00fck bot a\u011flar\u0131 olu\u015fturmalar\u0131 i\u00e7in uygun zemini sunmaktad\u0131r.<\/p>\n\n\n\n
Sonu\u00e7 olarak s\u0131f\u0131r g\u00fcn istismarlar\u0131n\u0131n siber su\u00e7lular\u0131n hedeflerine ula\u015fmalar\u0131nda ne kadar etkili olduklar\u0131na dair \u00e7ok say\u0131da istatisti\u011fe rastlamak m\u00fcmk\u00fcnd\u00fcr. A\u015fa\u011f\u0131daki \u00f6rnekler b\u00f6l\u00fcm\u00fcnde de g\u00f6rebilece\u011finiz gibi bu sald\u0131r\u0131lar\u0131n oda\u011f\u0131nda genellikle ulusal ya da politik bir hedef (Stuxnet), de\u011ferli verilere sahip bir \u015firket (RSA) ya da son derece geni\u015f bir kullan\u0131c\u0131 taban\u0131na sahip bir yaz\u0131l\u0131m (Zoom) yer almaktad\u0131r. <\/p>\n\n\n\n
S\u0131f\u0131r G\u00fcn Sald\u0131r\u0131lar\u0131 Neden Tehlikeli?<\/h2>\n\n\n\n
S\u0131f\u0131r g\u00fcn g\u00fcvenlik a\u00e7\u0131klar\u0131 konusunda, kurulu\u015flar\u0131n tehdit y\u00f6netimi i\u00e7in geleneksel y\u00f6ntemlere g\u00fcvenmeleri, istismarc\u0131lar\u0131n \u00f6nemli bir avantaja sahip oldu\u011fu anlam\u0131na gelir. <\/figcaption><\/figure><\/div>\n\n\n\n
Zero Day sald\u0131r\u0131lar\u0131n\u0131n siber g\u00fcvenlik uzmanlar\u0131n\u0131n kabusu olmas\u0131n\u0131n nedeni g\u00fcvenlik a\u00e7\u0131\u011f\u0131n\u0131n, istismar edilene kadar bilinmemesidir, a\u00e7\u0131\u011f\u0131n fark\u0131nda olunsa da yaz\u0131l\u0131m \u00fcreticisi yamay\u0131 yay\u0131nlama f\u0131rsat\u0131 bulamadan sald\u0131r\u0131lar ba\u015flayabilir.<\/p>\n\n\n\n
Genellikle vir\u00fcsten koruma veya k\u00f6t\u00fc ama\u00e7l\u0131 yaz\u0131l\u0131mdan koruma programlar\u0131, rutin internet etkinlikleri s\u0131ras\u0131nda kar\u015f\u0131la\u015f\u0131lan k\u00f6t\u00fc ama\u00e7l\u0131 yaz\u0131l\u0131mlar\u0131 yakalar. Ancak s\u0131f\u0131r\u0131nc\u0131 g\u00fcn a\u00e7\u0131klar\u0131nda, bir\u00e7ok geleneksel siber g\u00fcvenlik stratejisi koruma sa\u011flayamaz. Bu a\u00e7\u0131klarda web sitelerini g\u00f6r\u00fcnt\u00fclerken veya \u00fc\u00e7\u00fcnc\u00fc taraf programlar\u0131 indirirken cihaz\u0131n\u0131za vir\u00fcs bula\u015fma olas\u0131l\u0131\u011f\u0131 \u00e7ok daha y\u00fcksektir. S\u0131f\u0131r g\u00fcn g\u00fcvenlik a\u00e7\u0131klar\u0131 konusunda, kurulu\u015flar\u0131n tehdit y\u00f6netimi i\u00e7in geleneksel y\u00f6ntemlere g\u00fcvenmeleri, istismarc\u0131lar\u0131n \u00f6nemli bir avantaja sahip oldu\u011fu anlam\u0131na gelir. <\/p>\n\n\n\n
Daha \u00f6nce hi\u00e7 kimse g\u00fcvenlik a\u00e7\u0131\u011f\u0131ndan haberdar olmad\u0131\u011f\u0131 i\u00e7in, istismarla m\u00fccadelede minimum d\u00fczeyde savunma s\u00f6z konusudur ve bu da s\u0131f\u0131r g\u00fcnl\u00fck bir sald\u0131r\u0131n\u0131n ba\u015far\u0131l\u0131 olma olas\u0131l\u0131\u011f\u0131n\u0131 art\u0131r\u0131r. <\/p>\n\n\n\n
S\u0131f\u0131r g\u00fcn sald\u0131r\u0131lar\u0131 \u015firketler i\u00e7in son derece tehlikelidir \u00e7\u00fcnk\u00fc g\u00fcvenlik a\u00e7\u0131\u011f\u0131 geni\u015f \u00e7apta duyurulmam\u0131\u015fsa, potansiyel kurbanlar g\u00fcvenlik a\u00e7\u0131\u011f\u0131 bulunan sisteme dair \u015f\u00fcpheli etkinlik sinyallerini ka\u00e7\u0131rabilir. <\/p>\n\n\n\n
Yaz\u0131l\u0131m \u015firketlerinin g\u00fcvenlik a\u00e7\u0131\u011f\u0131 hakk\u0131ndaki bilgileri zaman zaman gizli tutmaya \u00e7al\u0131\u015fmalar\u0131 da sald\u0131rganlar a\u00e7\u0131s\u0131ndan \u00f6nemli bir avantajd\u0131r. Bir di\u011feri sald\u0131rganlar\u0131n s\u0131r sonsuza kadar s\u0131r olarak kalmayaca\u011f\u0131 i\u00e7in s\u0131f\u0131r g\u00fcn a\u00e7\u0131klar\u0131n\u0131 yaln\u0131zca y\u00fcksek, de\u011ferli hedeflere kar\u015f\u0131 kullanabilece\u011fi ger\u00e7e\u011fidir.<\/p>\n\n\n\n
Yamalar, genellikle s\u0131f\u0131r\u0131nc\u0131 g\u00fcn a\u00e7\u0131klar\u0131n\u0131n neden oldu\u011fu kusurlar\u0131 d\u00fczeltir, ancak ne yaz\u0131k ki an\u0131nda olu\u015fturulamazlar. Bu da sald\u0131rganlar\u0131n s\u0131n\u0131rs\u0131zca hareket etmeleri ve savunmas\u0131z hedeflere s\u0131f\u0131r g\u00fcn sald\u0131r\u0131lar\u0131 ger\u00e7ekle\u015ftirmeleri i\u00e7in ihtiya\u00e7 duyduklar\u0131 zamana sahip olduklar\u0131 anlam\u0131na gelir.<\/p>\n\n\n\n
S\u0131f\u0131r g\u00fcn sald\u0131r\u0131lar\u0131na y\u00f6nelik \u00e7\u00f6z\u00fcm\u00fcn uygulamada olmasa da teoride basit oldu\u011fu s\u00f6ylenebilir: Yamalar<\/strong>. Yaz\u0131l\u0131m yamalar\u0131 istismar edilen g\u00fcvenlik a\u00e7\u0131\u011f\u0131n\u0131 kapatan kod par\u00e7alar\u0131d\u0131r. Ancak ger\u00e7ekte yaln\u0131zca g\u00fcvenlik a\u00e7\u0131\u011f\u0131n\u0131n varl\u0131\u011f\u0131ndan haberdarsan\u0131z yama \u00e7al\u0131\u015ft\u0131rabilirsiniz. \u00dcstelik d\u00fczeltmelerin, g\u00fcncellemelerin yay\u0131nlanmas\u0131 g\u00fcnler, haftalar hatta aylar alabilir. <\/p>\n\n\n\n
Bir g\u00fcvenlik a\u00e7\u0131\u011f\u0131 belirlendikten sonra, yaz\u0131l\u0131m sat\u0131c\u0131s\u0131 taraf\u0131ndan yama olu\u015fturmak ve herhangi bir bilgi ihlalini payda\u015flara iletmek aciliyet ve sorumluluk i\u00e7eren \u00f6nemli g\u00f6revlerdir, ancak \u00e7o\u011fu g\u00fcvenlik a\u00e7\u0131\u011f\u0131n\u0131n d\u00fczeltilmesi haftalar s\u00fcrmekte ve bu da siber korsanlara bolca zaman tan\u0131maktad\u0131r.<\/p>\n\n\n\n
Sald\u0131r\u0131dan haberdar olur olmaz kullan\u0131c\u0131lar\u0131n yamalar\u0131 \u00e7al\u0131\u015ft\u0131rmas\u0131 da \u00f6nemlidir ama IoT cihazlar\u0131 da i\u015fin i\u00e7inde oldu\u011fundan \u00e7ok say\u0131da cihaza yama uygulanmas\u0131n\u0131 sa\u011flamak kolay olmayacakt\u0131r. Kald\u0131 ki g\u00fcncellemeler yay\u0131nland\u0131\u011f\u0131nda bile \u00e7o\u011fu insan bunlar\u0131 indirme ve y\u00fckleme konusunda ihmalkar davranabilmekte ya da ertelemektedir. <\/p>\n\n\n\n
S\u0131f\u0131r g\u00fcn a\u00e7\u0131\u011f\u0131 teorik olarak sabitlenebilse de uzun vadede sald\u0131rganlar i\u00e7in hala elveri\u015fli olabilir.<\/p>\n\n\n\n
\u0130deal olarak, g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 ke\u015ffedenler, m\u00fcmk\u00fcn olan en k\u0131sa s\u00fcrede yamalar\u0131n geli\u015ftirilmesi i\u00e7in yaz\u0131l\u0131m sat\u0131c\u0131lar\u0131n\u0131 haberdar etmelidir. Baz\u0131 yaz\u0131l\u0131m \u015firketleri, \u00fcr\u00fcnlerindeki g\u00fcvenlik a\u00e7\u0131klar\u0131yla ilgili bilgilendirmeler i\u00e7in \u00f6deme de yapmaktad\u0131r. Ancak su\u00e7 ekosisteminde s\u0131f\u0131r g\u00fcnl\u00fck g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131n ka\u015fifler taraf\u0131ndan y\u00fcksek \u00fccretlere sat\u0131ld\u0131\u011f\u0131 da bilinmektedir.<\/p>\n\n\n\n
S\u0131f\u0131r\u0131nc\u0131 g\u00fcn istismarlar\u0131, bir i\u015fletmeyi \u00e7e\u015fitli \u015fekillerde olumsuz etkileyebilir. De\u011ferli veya gizli verileri kaybetmenin yan\u0131 s\u0131ra, m\u00fc\u015fterilerin i\u015fletmeye olan g\u00fcvenin sars\u0131labilir.<\/p>\n\n\n\n
\u00c7o\u011fu insan, s\u0131f\u0131r g\u00fcn istismarlar\u0131n\u0131n, siber korsanlar taraf\u0131ndan kullan\u0131ld\u0131\u011f\u0131n\u0131 d\u00fc\u015f\u00fcnse de d\u00fcnyan\u0131n d\u00f6rt bir yan\u0131ndaki devlet kurumlar\u0131, \u00e7o\u011funlukla g\u00f6zetim amac\u0131yla veya kendi siber sald\u0131r\u0131lar\u0131nda kullan\u0131lmak \u00fczere s\u0131f\u0131r g\u00fcn a\u00e7\u0131klar\u0131n\u0131n pe\u015findedir. <\/p>\n\n\n\n
Hem \u00c7in hem de ABD istihbarat\u0131n\u0131n casusluk veya siber sabotaj amac\u0131yla kullanabilecekleri s\u0131f\u0131r g\u00fcn g\u00fcvenlik a\u00e7\u0131klar\u0131 hakk\u0131nda bilgi toplad\u0131\u011f\u0131 bilinmektedir. Hatta s\u0131f\u0131r\u0131nc\u0131 g\u00fcn g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 ve bunlardan yararlanman\u0131n yollar\u0131n\u0131 ilk \u00f6\u011frenen olmak i\u00e7in, sald\u0131rganlar ve devlet destekli gruplar\u0131n, \u015fiddetli rekabetinin sonucunda geli\u015fen bir karaborsan\u0131n ortaya \u00e7\u0131kt\u0131\u011f\u0131 s\u00f6ylenebilir.<\/p>\n\n\n\n
S\u0131f\u0131r g\u00fcn istismarlar\u0131n\u0131 ba\u015flatan; yaz\u0131l\u0131m geli\u015ftiricisi taraf\u0131ndan fark\u0131nda olmadan olu\u015fturulan g\u00fcvenlik a\u00e7\u0131\u011f\u0131n\u0131n bir bilgisayar korsan\u0131 taraf\u0131ndan bulunmas\u0131d\u0131r. <\/figcaption><\/figure><\/div>\n\n\n\n
Kimlik av\u0131 e-posta sald\u0131r\u0131lar\u0131 gibi siber sald\u0131r\u0131 t\u00fcrleri, bir e-postadan dosya indirmek ya da bir ba\u011flant\u0131ya t\u0131klamak i\u00e7in kullan\u0131c\u0131 etkile\u015fimi gerektirir. Buna kar\u015f\u0131l\u0131k s\u0131f\u0131r g\u00fcn sald\u0131r\u0131s\u0131, hedef cihaza do\u011frudan bula\u015fmak i\u00e7in i\u015fletim sistemini veya bir yaz\u0131l\u0131m kusurunu potansiyel olarak k\u00f6t\u00fcye kullan\u0131r, bu da ba\u015far\u0131 \u015fans\u0131n\u0131 art\u0131r\u0131r.<\/p>\n\n\n\n
S\u0131f\u0131r g\u00fcn sald\u0131r\u0131lar\u0131 onlar\u0131 bilen tek ki\u015fi sald\u0131rganlar\u0131n kendisi oldu\u011fundan tehlikelidir. Bir a\u011fa s\u0131zd\u0131ktan sonra, su\u00e7lular ya hemen sald\u0131rabilir ya da bunu yapmak i\u00e7in stratejik olarak en iyi zaman\u0131 bekleyebilir.<\/p>\n\n\n\n
S\u0131f\u0131r g\u00fcn istismarlar\u0131n\u0131 ba\u015flatan; yaz\u0131l\u0131m geli\u015ftiricisi taraf\u0131ndan fark\u0131nda olmadan olu\u015fturulan g\u00fcvenlik a\u00e7\u0131\u011f\u0131n\u0131n bir bilgisayar korsan\u0131 taraf\u0131ndan bulunmas\u0131d\u0131r. Bu g\u00fcvenlik a\u00e7\u0131\u011f\u0131n\u0131 hedeflemek i\u00e7in kod yaz\u0131lmas\u0131 ve kodun k\u00f6t\u00fc ama\u00e7l\u0131 yaz\u0131l\u0131m olarak paketlenmesi bir sonraki ad\u0131md\u0131r. <\/p>\n\n\n\n
\u0130stismar kodu, yaz\u0131l\u0131m kullan\u0131c\u0131lar\u0131n\u0131n, kimlik h\u0131rs\u0131zl\u0131\u011f\u0131 veya di\u011fer siber su\u00e7 t\u00fcrleri yoluyla ma\u011fdur olmas\u0131na neden olabilir. \u00c7\u00fcnk\u00fc sald\u0131rganlar s\u0131f\u0131r g\u00fcn g\u00fcvenlik a\u00e7\u0131\u011f\u0131n\u0131 ke\u015ffettikten sonra, g\u00fcvenlik a\u00e7\u0131\u011f\u0131 bulunan sisteme ula\u015fmak i\u00e7in bir araca ihtiya\u00e7 duyarlar. Bunu genellikle sosyal m\u00fchendislik kullanarak tasarlanm\u0131\u015f bir e-posta yoluyla yaparlar. <\/p>\n\n\n\n
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