{"id":7583,"date":"2019-05-08T16:23:30","date_gmt":"2019-05-08T20:23:30","guid":{"rendered":"https:\/\/www.cscdigitalbrand.services\/blog\/?p=7583"},"modified":"2022-07-20T10:48:03","modified_gmt":"2022-07-20T14:48:03","slug":"dns-den-forbisedda-byggstenen-del-1","status":"publish","type":"post","link":"https:\/\/www.cscdbs.com\/blog\/dns-den-forbisedda-byggstenen-del-1\/","title":{"rendered":"DNS: Den f\u00f6rbisedda byggstenen, del 1 &#8211; Vad DNS \u00e4r och varf\u00f6r det \u00e4r s\u00e5rbart"},"content":{"rendered":"\n<p><i>av Ken Linscott<\/i><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The domain name system (DNS) \u00e4r infrastrukturen som ligger bakom Internet. Alla som \u00e4r teknologiskt bevandrade vet att DNS \u00e4r den byggsten som l\u00e4gger grunden f\u00f6r varje organisations n\u00e4rvaro online.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Varje webbsida har en unik sifferkombination, \u00e4ven kallat IP-adress,\noch DNS \u00f6vers\u00e4tter de f\u00f6r m\u00e4nniskan mer l\u00e4ttf\u00f6rst\u00e5eliga bokstavsbaserade\ndom\u00e4nnamn som anv\u00e4nds n\u00e4r vi s\u00f6ker p\u00e5 Internet till IP-adresser som \u00e4r l\u00e4ttare\nf\u00f6r datorer att hantera.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I detta, som \u00e4r v\u00e5rt f\u00f6rsta inl\u00e4gg i v\u00e5r serie om DNS, skriver vi om att drifts\u00e4ker DNS \u00e4r av st\u00f6rsta vikt f\u00f6r en organisations n\u00e4rvaro online och hur framg\u00e5ngsrik man \u00e4r, samt att valet av DNS spelar en avg\u00f6rande roll i att f\u00f6rhindra cyberattacker. Forts\u00e4tt att l\u00e4sa f\u00f6r att l\u00e4ra dig mer om hur DNS fungerar.  <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>P\u00e5litlig DNS = Framg\u00e5ngsrikt varum\u00e4rke och \u00f6kat kundf\u00f6rtroende<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Den springande punkten f\u00f6r valet av DNS \u00e4r drifts\u00e4kerheten, dvs. att\nrisken f\u00f6r driftstopp \u00e4r s\u00e5 liten som m\u00f6jligt. F\u00f6rutom os\u00e4ker drifts\u00e4kerhet och\nrisken det inneb\u00e4r i form av att ens hemsidor kan sluta fungera s\u00e5 \u00f6ppnar \u00e4ven\nsvag DNS upp f\u00f6r en m\u00e4ngd risker f\u00f6r olika cyberattacker och den kostnad det\ninneb\u00e4r att r\u00e4tta till problemen som det kan medf\u00f6ra. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nyligen intr\u00e4ffade cyberattacker visar p\u00e5 olika tekniker som anv\u00e4nds\nf\u00f6r att f\u00e5nga upp och manipulera legitim webbtrafik och d\u00e4rigenom komma \u00e5t\nanv\u00e4ndaruppgifter och mejladresser f\u00f6r att utf\u00f6ra aktiviteter som phishing. I\nvissa fall har det anv\u00e4nts gratisversioner av digitala certifikat &#8211; som kr\u00e4ver\nl\u00e5g validation &#8211; f\u00f6r att \u00f6ka trov\u00e4rdigheten i brotten. Sluga tillv\u00e4gag\u00e5ngss\u00e4tt\nsom detta g\u00f6r problemen \u00e4n mer komplicerade att hantera f\u00f6r organisationer.\nBrister i s\u00e4kerheten skadar organisationers anseende v\u00e4rlden \u00f6ver och\nkonsumenter \u00e4r tr\u00f6tta p\u00e5 att deras information finns tillg\u00e4nglig att bli stulen\nav brottslingar.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Om ens DNS inte fungerar betyder det att webbsidor som \u00e4r kopplade dit\ninte heller kommer fungera, dessutom p\u00e5verkas mejlen vilket betyder att t.ex.\npersonal p\u00e5 en organisation vare sig kan skicka eller ta emot mejl. Om en organisation anv\u00e4nder\nIP-telefoni f\u00f6r att ringa och ta emot samtal s\u00e5 slutar \u00e4ven detta att fungera\noch personal som jobbar p\u00e5 distans kan inte komma \u00e5t n\u00e4tverket, vilket betyder\natt man l\u00e4mnas till fasta telefoner och mobila enheter f\u00f6r att ringa och det\nfaktum att personalen som arbetar p\u00e5 distans faller bort g\u00f6r att organisationen\nblir underbemannad n\u00e4r all personal beh\u00f6vs som mest.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.cscdigitalbrand.services\/blog\/wp-content\/uploads\/2019\/05\/Swedish-Slide-1-1024x576.jpg\" alt=\"\" class=\"wp-image-7584\" srcset=\"https:\/\/cscwebcontentstorage.blob.core.windows.net\/cscmarketing-cscdbs-media\/uploads\/2019\/05\/Swedish-Slide-1-1024x576.jpg 1024w, https:\/\/cscwebcontentstorage.blob.core.windows.net\/cscmarketing-cscdbs-media\/uploads\/2019\/05\/Swedish-Slide-1-300x169.jpg 300w, https:\/\/cscwebcontentstorage.blob.core.windows.net\/cscmarketing-cscdbs-media\/uploads\/2019\/05\/Swedish-Slide-1-768x432.jpg 768w, https:\/\/cscwebcontentstorage.blob.core.windows.net\/cscmarketing-cscdbs-media\/uploads\/2019\/05\/Swedish-Slide-1.jpg 1117w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Hur DNS fungerar<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">F\u00f6rfr\u00e5gningar p\u00e5 Internet g\u00e5r f\u00f6rst till ens internet service provider\n(ISP),&nbsp; om ISP har IP-adressen sparad\n(cachad) s\u00e5 kommer datorn svara med korrekt information direkt fr\u00e5n ISP. Om ISP\ninte har IP-adressen cachad,s\u00e5 g\u00e5r fr\u00e5gan vidare till rot-dns:erna som ger svar\np\u00e5 vilken registrar det \u00e4r som har den korrekta IP-adressen. Registraren\nber\u00e4ttar sedan i sin tur f\u00f6r datorn vilken officiell DNS det \u00e4r som har\ninneh\u00e5llet till din f\u00f6rfr\u00e5gan.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Detta \u00e4r en komplex resa som vanligtvis h\u00e4nder utan problem p\u00e5 bara\nn\u00e5gra f\u00e5 millisekunder. Det \u00e4r p\u00e5 grund av denna komplexitet som kriminella kan\n\u00e4ventyra processen och utf\u00f6ra attacker och d\u00e4rmed stj\u00e4la eller rikta om trafik\ntill korrupta eller kriminella webbsidor.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.cscdigitalbrand.services\/blog\/wp-content\/uploads\/2019\/05\/Swedish-Slide-2-1024x576.jpg\" alt=\"\" class=\"wp-image-7585\" srcset=\"https:\/\/cscwebcontentstorage.blob.core.windows.net\/cscmarketing-cscdbs-media\/uploads\/2019\/05\/Swedish-Slide-2-1024x576.jpg 1024w, https:\/\/cscwebcontentstorage.blob.core.windows.net\/cscmarketing-cscdbs-media\/uploads\/2019\/05\/Swedish-Slide-2-300x169.jpg 300w, https:\/\/cscwebcontentstorage.blob.core.windows.net\/cscmarketing-cscdbs-media\/uploads\/2019\/05\/Swedish-Slide-2-768x432.jpg 768w, https:\/\/cscwebcontentstorage.blob.core.windows.net\/cscmarketing-cscdbs-media\/uploads\/2019\/05\/Swedish-Slide-2.jpg 1117w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>N\u00e4sta inl\u00e4gg<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I v\u00e5rt n\u00e4sta inl\u00e4gg kommer vi skriva om fem s\u00e4tt p\u00e5 vilket DNS \u00e4r\ns\u00e5rbart som utnyttjas av kriminella<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.cscdigitalbrand.services\/blog\/email-sign-up\/\">Prenumerera p\u00e5 v\u00e5r blogg och f\u00e5 aviseringar om v\u00e5ra senaste inl\u00e4gg.<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>L\u00e4s fler inl\u00e4gg i den h\u00e4r serien:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.cscdigitalbrand.services\/blog\/dns-den-forbisedda-byggstenen-del-2\/\">&gt;&gt;\nDel 2 \u2013 Fyra DNS-s\u00e5rbarheter som du\nbeh\u00f6ver veta om.<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.cscdigitalbrand.services\/blog\/dns-den-forbisedda-byggstenen-del-3\/\">&gt;&gt;\nDel 3 \u2013 Sex andra s\u00e4tt som DNS \u00e4r\ns\u00e5rbart, som g\u00f6r s\u00e4kerhet avg\u00f6rande<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.cscdigitalbrand.services\/blog\/dns-den-forbisedda-byggstenen-del-4\/\">&gt;&gt; Del 4 \u2013 Det v\u00e4xande hotet med DNS-kapningar och domain shadowing<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.cscdigitalbrand.services\/blog\/dns-den-forbisedda-byggstenen-del-5\/\">&gt;&gt;\nDel 5 \u2013 Minska risken f\u00f6r 10 allvarliga DNS s\u00e5rbarheter<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>av Ken Linscott The domain name system (DNS) \u00e4r infrastrukturen som ligger bakom Internet. Alla som \u00e4r teknologiskt bevandrade vet att DNS \u00e4r den byggsten som l\u00e4gger grunden f\u00f6r varje organisations n\u00e4rvaro online. Varje webbsida har en unik sifferkombination, \u00e4ven kallat IP-adress, och DNS \u00f6vers\u00e4tter de f\u00f6r m\u00e4nniskan mer l\u00e4ttf\u00f6rst\u00e5eliga bokstavsbaserade dom\u00e4nnamn som anv\u00e4nds n\u00e4r [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[546],"tags":[],"class_list":["post-7583","post","type-post","status-publish","format-standard","hentry","category-se"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>DNS: Den f\u00f6rbisedda byggstenen, del 1 - Vad DNS \u00e4r och varf\u00f6r det \u00e4r s\u00e5rbart | CSC<\/title>\n<meta name=\"description\" content=\"av Ken Linscott The domain name system (DNS) \u00e4r infrastrukturen som ligger bakom Internet. 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