{"id":501,"date":"2026-11-01T17:31:37","date_gmt":"2026-11-01T17:31:37","guid":{"rendered":"https:\/\/www.aliburaksan.com\/blog\/linux-cekirdeginde-kritik-mptcp-acigi-uzaktan-root-yetkisi-tehlikesi\/"},"modified":"2026-11-01T18:21:46","modified_gmt":"2026-11-01T18:21:46","slug":"linux-cekirdeginde-kritik-mptcp-acigi-uzaktan-root-yetkisi-tehlikesi","status":"publish","type":"post","link":"https:\/\/www.aliburaksan.com\/blog\/linux-cekirdeginde-kritik-mptcp-acigi-uzaktan-root-yetkisi-tehlikesi\/","title":{"rendered":"Linux \u00c7ekirde\u011finde Kritik MPTCP A\u00e7\u0131\u011f\u0131: Uzaktan Root Yetkisi Tehlikesi"},"content":{"rendered":"<p>Linux i\u015fletim sistemi \u00e7ekirde\u011finde, uzaktaki ve kimli\u011fi do\u011frulanmam\u0131\u015f sald\u0131rganlar\u0131n hedef sunucularda en y\u00fcksek yetki seviyesi olan &#8220;root&#8221; haklar\u0131yla rastgele kod \u00e7al\u0131\u015ft\u0131rmas\u0131na (RCE) olanak tan\u0131yan kritik bir g\u00fcvenlik zafiyeti tespit edildi. Anthropic b\u00fcnyesinde g\u00f6rev yapan siber g\u00fcvenlik ara\u015ft\u0131rmac\u0131lar\u0131 taraf\u0131ndan geli\u015ftirilen konsept kan\u0131t\u0131 (PoC) niteli\u011findeki istismar kodu, Multipath TCP (MPTCP) dinleyicileri \u00e7al\u0131\u015ft\u0131ran modern Linux sistemlerinin do\u011frudan hedef al\u0131nabildi\u011fini ortaya koydu.<\/p>\n<h2>MPTCP Mimarisi ve Zafiyetin Teknik Kapsam\u0131<\/h2>\n<p>Multipath TCP, standart TCP protokol\u00fcn\u00fcn birden fazla a\u011f aray\u00fcz\u00fcn\u00fc (\u00f6rne\u011fin ayn\u0131 anda hem Wi-Fi hem de h\u00fccresel ba\u011flant\u0131 veya \u00e7oklu Ethernet portlar\u0131) e\u015fzamanl\u0131 kullanarak veri iletimini optimize eden geli\u015fmi\u015f bir a\u011f standard\u0131d\u0131r. Ak\u0131\u015f yedeklili\u011fi ve bant geni\u015fli\u011fi art\u0131\u015f\u0131 sa\u011flamak amac\u0131yla tasarlanan bu teknoloji, \u00f6zellikle modern bulut altyap\u0131lar\u0131nda, telekom\u00fcnikasyon sistemlerinde ve y\u00fcksek eri\u015filebilirlik gerektiren veri merkezlerinde yayg\u0131n olarak yap\u0131land\u0131r\u0131lmaktad\u0131r.<\/p>\n<p>Ara\u015ft\u0131rmac\u0131lar\u0131n sundu\u011fu teknik bulgulara g\u00f6re zafiyet, \u00e7ekirde\u011fin MPTCP ba\u011flant\u0131 isteklerini i\u015fleme ve bellek bloklar\u0131n\u0131 tahsis etme a\u015famas\u0131ndaki bir mant\u0131k hatas\u0131ndan kaynaklan\u0131yor. Sald\u0131rganlar, \u00f6zel olarak haz\u0131rlanm\u0131\u015f TCP paket dizilimlerini dinleme modundaki bir MPTCP soketine ileterek \u00e7ekirdek bellek alan\u0131nda ta\u015fma veya yetkisiz yazma ko\u015fulu olu\u015fturabiliyor. Bu durum, uzaktan sisteme s\u0131zmak isteyen bir akt\u00f6r\u00fcn herhangi bir kimlik do\u011frulama a\u015famas\u0131n\u0131 ge\u00e7meden, do\u011frudan \u00e7ekirdek seviyesinde komut y\u00fcr\u00fctmesine zemin haz\u0131rl\u0131yor.<\/p>\n<h2>Kurumsal Sistemler \u00dczerindeki Risk Fakt\u00f6rleri<\/h2>\n<p>Linux \u00e7ekirdek a\u00e7\u0131\u011f\u0131, CVSS skorlama kriterlerine g\u00f6re en y\u00fcksek tehlike s\u0131n\u0131fland\u0131rmas\u0131 olan &#8220;Kritik&#8221; kategorisinde de\u011ferlendiriliyor. Sald\u0131r\u0131n\u0131n uzaktan tetiklenebilir olmas\u0131, herhangi bir kullan\u0131c\u0131 etkile\u015fimi gerektirmemesi ve do\u011frudan &#8220;root&#8221; ayr\u0131cal\u0131klar\u0131na ula\u015fmas\u0131, tehdidin boyutunu katlayarak art\u0131r\u0131yor. Bu a\u00e7\u0131k ba\u015far\u0131yla istismar edildi\u011finde kurumlar \u015fu sonu\u00e7larla kar\u015f\u0131 kar\u015f\u0131ya kalabilir:<\/p>\n<ul>\n<li>Sunucu \u00fczerindeki t\u00fcm verilerin yetkisiz olarak d\u0131\u015far\u0131 s\u0131zd\u0131r\u0131lmas\u0131 veya geri d\u00f6nd\u00fcr\u00fclemez bi\u00e7imde silinmesi<\/li>\n<li>Sistem \u00e7ekirde\u011fine gizlenen ve tespit edilmesi son derece g\u00fc\u00e7 olan &#8220;rootkit&#8221; yaz\u0131l\u0131mlar\u0131n\u0131n konu\u015fland\u0131r\u0131lmas\u0131<\/li>\n<li>Ele ge\u00e7irilen kurumsal sunucunun bir atlama noktas\u0131 (pivot) olarak kullan\u0131larak i\u00e7 a\u011fdaki di\u011fer kritik varl\u0131klara eri\u015fim sa\u011flanmas\u0131<\/li>\n<li>Sistem genelinde hizmet d\u0131\u015f\u0131 b\u0131rakma (DoS) d\u00f6ng\u00fclerinin ba\u015flat\u0131lmas\u0131 ve operasyonel kesintilerin ya\u015fanmas\u0131<\/li>\n<\/ul>\n<h2>Tespit ve Altyap\u0131y\u0131 Koruma Stratejileri<\/h2>\n<p>Zafiyet yaln\u0131zca sistemlerinde MPTCP mod\u00fcl\u00fc aktif olan ve a\u011f \u00fczerinde bu protokol \u00fczerinden dinleme ger\u00e7ekle\u015ftiren Linux da\u011f\u0131t\u0131mlar\u0131n\u0131 etkilemektedir. Standart Linux kurulumlar\u0131nda MPTCP her zaman varsay\u0131lan olarak a\u00e7\u0131k gelmese de modern \u00e7ekirdek s\u00fcr\u00fcmlerinde (v5.6 ve sonras\u0131) yerel destek mevcuttur ve bir\u00e7ok kurumsal orkestrasyon arac\u0131nda performans amac\u0131yla aktive edilmektedir.<\/p>\n<p>Sistem ve a\u011f y\u00f6neticilerinin acil olarak atmas\u0131 gereken g\u00fcvenlik ad\u0131mlar\u0131 a\u015fa\u011f\u0131da listelenmi\u015ftir:<\/p>\n<ul>\n<li>\u00c7ekirdek g\u00fcncellemelerinin gecikmeksizin da\u011f\u0131t\u0131lmas\u0131 ve da\u011f\u0131t\u0131m sa\u011flay\u0131c\u0131lar\u0131n\u0131n yay\u0131mlad\u0131\u011f\u0131 g\u00fcvenlik yamalar\u0131n\u0131n \u00fcretim ortamlar\u0131na uygulanmas\u0131<\/li>\n<li>MPTCP kullan\u0131m\u0131na kesin bir ihtiya\u00e7 duyulmayan sistemlerde bu mod\u00fcl\u00fcn \u00e7ekirdek parametreleri \u00fczerinden tamamen devre d\u0131\u015f\u0131 b\u0131rak\u0131lmas\u0131<\/li>\n<li>G\u00fcvenlik duvarlar\u0131 (Firewall) ve sald\u0131r\u0131 tespit\/\u00f6nleme sistemleri (IDS\/IPS) \u00fczerinde ola\u011fand\u0131\u015f\u0131 TCP se\u00e7enekleri i\u00e7eren ba\u011flant\u0131 isteklerinin filtrelenmesi<\/li>\n<li>A\u011f dinleme haritalar\u0131n\u0131n kontrol edilerek MPTCP soketlerinin d\u0131\u015f internete a\u00e7\u0131k olup olmad\u0131\u011f\u0131n\u0131n denetlenmesi<\/li>\n<\/ul>\n<p>Sonu\u00e7 olarak bu Linux \u00e7ekirdek a\u00e7\u0131\u011f\u0131, derinlemesine savunma stratejisinin ve yama y\u00f6netim s\u00fcre\u00e7lerinin hayati \u00f6nemini bir kez daha g\u00f6stermektedir. A\u011f y\u00f6neticilerinin sistem loglar\u0131n\u0131 izleyerek \u015f\u00fcpheli \u00e7ekirdek \u00e7\u00f6kmelerini ve bellek ihlallerini yak\u0131ndan takip etmesi tavsiye edilmektedir.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Linux \u00e7ekirde\u011findeki kritik MPTCP a\u00e7\u0131\u011f\u0131, uzaktan kimlik do\u011frulamas\u0131z root eri\u015fimine izin veriyor. Sistem y\u00f6neticileri i\u00e7in detaylar ve \u00f6nlemler.<\/p>\n","protected":false},"author":1,"featured_media":517,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36],"tags":[18,17],"class_list":["post-501","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-siber-guvenlik-istihbarat","tag-cyber-security","tag-siber-guvenlik"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Linux \u00c7ekirde\u011finde Kritik MPTCP A\u00e7\u0131\u011f\u0131: Uzaktan Root Yetkisi Tehlikesi<\/title>\n<meta name=\"description\" content=\"Linux \u00e7ekirde\u011findeki kritik MPTCP a\u00e7\u0131\u011f\u0131, uzaktan kimlik do\u011frulamas\u0131z root eri\u015fimine izin veriyor. 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