<\/p>\n
VPN y\u0131llarca uzaktan eri\u015fimin tek ger\u00e7ek \u00e7\u00f6z\u00fcm\u00fcyd\u00fc. T\u00fcnele ba\u011flan\u0131rs\u0131n, \u015firket a\u011f\u0131na girersin, i\u015fine bakars\u0131n. Sorun \u015fu ki bu model, “i\u00e7eri girdiysen g\u00fcvenilirsin” varsay\u0131m\u0131na dayan\u0131yor. Bulutun, hibrit \u00e7al\u0131\u015fman\u0131n ve neredeyse her hafta yeni bir kritik zafiyetin konu\u015fuldu\u011fu bir d\u00f6nemde bu varsay\u0131m art\u0131k pek ta\u015f\u0131m\u0131yor.<\/p>\n
Bu yaz\u0131da Zero Trust’\u0131n VPN mant\u0131\u011f\u0131ndan tam olarak nerede ayr\u0131ld\u0131\u011f\u0131na, VPN’in ger\u00e7ekten \u00f6l\u00fcp \u00f6lmedi\u011fine ve ge\u00e7i\u015fe ba\u015flarken nelere dikkat etmek gerekti\u011fine bak\u0131yoruz. Arada da Barracuda’n\u0131n yak\u0131n zamanda yay\u0131nlad\u0131\u011f\u0131 uyar\u0131y\u0131 \u00f6rnek olarak ele al\u0131yoruz.<\/p>\n
VPN kurmak, ba\u011flant\u0131 sorunlar\u0131n\u0131 ay\u0131klamak, performansla u\u011fra\u015fmak \u00e7o\u011fu IT ekibinin g\u00fcndelik i\u015fi. Mant\u0131\u011f\u0131 da basit: kimlik bilgilerini girersin, t\u00fcnele girersin ve art\u0131k a\u011f\u0131n i\u00e7indesin. Buna kale ve hendek modeli diyebiliriz. Duvar\u0131 bir kez a\u015fan, i\u00e7eride rahat\u00e7a dola\u015f\u0131r.<\/p>\n
Bu yakla\u015f\u0131m iki yerde \u00e7atl\u0131yor:<\/p>\n
Zero Trust’\u0131n temel fikri tek c\u00fcmle: asla g\u00fcvenme, her seferinde do\u011frula<\/strong> (never trust, always verify). D\u0131\u015far\u0131dan gelen iste\u011fe de i\u00e7eriden gelen iste\u011fe de ayn\u0131 \u015f\u00fcpheyle bakar. “G\u00fcvenilir i\u00e7 a\u011f” kavram\u0131n\u0131 bir kenara b\u0131rak\u0131r.<\/p>\n Mimarinin dayand\u0131\u011f\u0131 be\u015f temel ta\u015f var:<\/p>\n Bu modelde ofis duvarlar\u0131 art\u0131k tek savunma hatt\u0131 de\u011fil. Her kullan\u0131c\u0131, cihaz ve uygulama kendi s\u0131n\u0131r\u0131n\u0131 ta\u015f\u0131yor ve o s\u0131n\u0131r s\u00fcrekli denetleniyor.<\/p>\n Fark\u0131 \u015f\u00f6yle d\u00fc\u015f\u00fcnebilirsin: VPN, binaya girerken sana t\u00fcm odalar\u0131n anahtar\u0131n\u0131 teslim ediyor. Zero Trust ise yaln\u0131zca gidece\u011fin odan\u0131n anahtar\u0131n\u0131 veriyor ve oraya girerken de kim oldu\u011funu tekrar soruyor. Bir sald\u0131rgan hesab\u0131n\u0131 ele ge\u00e7irse bile elinde tek odan\u0131n anahtar\u0131 olur.<\/p>\n <\/p>\n Barracuda Networks kritik bir g\u00fcvenlik uyar\u0131s\u0131 yay\u0131nlad\u0131. Uyar\u0131ya g\u00f6re iki zafiyet birle\u015ftirildi\u011finde bir sald\u0131rgan yetki kontrollerini atlat\u0131p cihazda root eri\u015fimi elde edebiliyor. \u0130lk zafiyet (CVE-2026-116606), Email Security Gateway’deki bir kimlik do\u011frulama zay\u0131fl\u0131\u011f\u0131 ve cihaz\u0131n genel yap\u0131land\u0131rmas\u0131n\u0131n de\u011fi\u015ftirilmesine izin verebiliyor. \u0130kincisi (CVE-2026-111560) ise y\u00f6netici yetkisine sahip birinin i\u015fletim sistemi komutu enjekte etmesine ve bu komutu root olarak \u00e7al\u0131\u015ft\u0131rmas\u0131na yol a\u00e7\u0131yor.<\/p>\n Email Security Gateway her iki zafiyetten de etkileniyor. Load Balancer ADC, Web Application Firewall, Message Archiver, WAF Control Center ve Web Security Gateway ise yaln\u0131zca ikinci zafiyetten etkileniyor. Her \u00fcr\u00fcn i\u00e7in ayr\u0131 bir yama yay\u0131nland\u0131.<\/p>\n\n
VPN ve Zero Trust Yan Yana<\/h2>\n
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\n \n\u00d6zellik<\/th>\n Geleneksel VPN<\/th>\n Zero Trust (ZTNA)<\/th>\n<\/tr>\n<\/thead>\n \n Eri\u015fim modeli<\/td>\n Ba\u011flan\u0131nca a\u011f\u0131n b\u00fcy\u00fck k\u0131sm\u0131 a\u00e7\u0131l\u0131r<\/td>\n Yaln\u0131zca yetkili olunan uygulama ya da kaynak a\u00e7\u0131l\u0131r<\/td>\n<\/tr>\n \n G\u00fcven varsay\u0131m\u0131<\/td>\n \u0130\u00e7 a\u011fa g\u00fcvenilir<\/td>\n Hi\u00e7bir \u015feye g\u00fcvenilmez, s\u00fcrekli do\u011frulan\u0131r<\/td>\n<\/tr>\n \n Sald\u0131r\u0131 y\u00fczeyi<\/td>\n Geni\u015f<\/td>\n Dar (segmentasyon, kayna\u011fa \u00f6zel eri\u015fim)<\/td>\n<\/tr>\n \n Yanal hareket<\/td>\n Y\u00fcksek risk<\/td>\n Zorla\u015ft\u0131r\u0131lm\u0131\u015f<\/td>\n<\/tr>\n \n Performans<\/td>\n Trafik merkeze geri d\u00f6ner<\/td>\n Kayna\u011fa do\u011frudan y\u00f6nlendirilir<\/td>\n<\/tr>\n \n Bulut uyumu<\/td>\n Zay\u0131f<\/td>\n Ba\u015ftan bulut odakl\u0131<\/td>\n<\/tr>\n \n Kullan\u0131c\u0131 deneyimi<\/td>\n Bazen yava\u015f, ara ara kopmalar<\/td>\n Genelde daha ak\u0131c\u0131<\/td>\n<\/tr>\n \n Y\u00f6netim<\/td>\n A\u011f tabanl\u0131<\/td>\n Kimlik ve uygulama tabanl\u0131<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n Barracuda Uyar\u0131s\u0131: \u00c7evre Cihaz\u0131 Ele Ge\u00e7irilirse Ne Olur?<\/h2>\n