{"id":3555,"date":"2024-09-11T14:38:04","date_gmt":"2024-09-11T14:38:04","guid":{"rendered":"https:\/\/www.vipservis.com\/blog\/?p=3555"},"modified":"2024-09-11T14:38:23","modified_gmt":"2024-09-11T14:38:23","slug":"aspde-a-potentially-dangerous-request-hatasinin-cozumu","status":"publish","type":"post","link":"https:\/\/www.vipservis.com\/blog\/aspde-a-potentially-dangerous-request-hatasinin-cozumu\/","title":{"rendered":"ASP\u2019de \u201cA potentially dangerous Request\u201d Hatas\u0131n\u0131n \u00c7\u00f6z\u00fcm\u00fc"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0130\u00e7indekiler<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #ff0f0f;color:#ff0f0f\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #ff0f0f;color:#ff0f0f\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.vipservis.com\/blog\/aspde-a-potentially-dangerous-request-hatasinin-cozumu\/#ASPde_%E2%80%9CA_potentially_dangerous_Request%E2%80%9D_Hatasinin_Cozumu\" >ASP\u2019de \u201cA potentially dangerous Request\u201d Hatas\u0131n\u0131n \u00c7\u00f6z\u00fcm\u00fc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.vipservis.com\/blog\/aspde-a-potentially-dangerous-request-hatasinin-cozumu\/#Cozum_Yontemleri\" >\u00c7\u00f6z\u00fcm Y\u00f6ntemleri<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.vipservis.com\/blog\/aspde-a-potentially-dangerous-request-hatasinin-cozumu\/#1_ValidateRequest_Ayarini_Kapatmak\" >1. ValidateRequest Ayar\u0131n\u0131 Kapatmak<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.vipservis.com\/blog\/aspde-a-potentially-dangerous-request-hatasinin-cozumu\/#2_RequestValidationMode_Ayarini_Degistirmek\" >2. RequestValidationMode Ayar\u0131n\u0131 De\u011fi\u015ftirmek<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.vipservis.com\/blog\/aspde-a-potentially-dangerous-request-hatasinin-cozumu\/#3_AllowHtml_Ozelligini_Kullanmak\" >3. [AllowHtml] \u00d6zelli\u011fini Kullanmak<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.vipservis.com\/blog\/aspde-a-potentially-dangerous-request-hatasinin-cozumu\/#4_AntiXSS_Kutuphanesi_Kullanmak\" >4. AntiXSS K\u00fct\u00fcphanesi Kullanmak<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.vipservis.com\/blog\/aspde-a-potentially-dangerous-request-hatasinin-cozumu\/#Guvenlik_Onlemleri\" >G\u00fcvenlik \u00d6nlemleri<\/a><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"ASPde_%E2%80%9CA_potentially_dangerous_Request%E2%80%9D_Hatasinin_Cozumu\"><\/span>ASP\u2019de \u201cA potentially dangerous Request\u201d Hatas\u0131n\u0131n \u00c7\u00f6z\u00fcm\u00fc<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>ASP.NET projelerinde, kullan\u0131c\u0131 taraf\u0131ndan g\u00f6nderilen bir formda potansiyel olarak tehlikeli karakterler (\u00f6rne\u011fin, <code>&lt;<\/code>, <code>&gt;<\/code>, vb.) bulundu\u011funda, <strong>&#8220;A potentially dangerous Request.Form value was detected&#8221;<\/strong> hatas\u0131 ile kar\u015f\u0131la\u015fabilirsiniz. Bu hata, genellikle HTML ve JavaScript kodlar\u0131n\u0131n form verisi olarak g\u00f6nderilmesi durumunda ortaya \u00e7\u0131kar ve ASP.NET uygulamalar\u0131n\u0131 bu t\u00fcr zararl\u0131 i\u00e7eriklerden korumak i\u00e7in yerle\u015fik bir g\u00fcvenlik \u00f6nlemidir.<\/p>\n<p>Bu hatan\u0131n \u00e7\u00f6z\u00fcm\u00fc i\u00e7in, ASP.NET&#8217;in bu t\u00fcr tehlikeli karakterleri kabul etmesini sa\u011flayacak birka\u00e7 farkl\u0131 y\u00f6ntem mevcuttur. Ancak bu \u00e7\u00f6z\u00fcmleri uygularken g\u00fcvenlik \u00f6nlemlerini g\u00f6z ard\u0131 etmemek olduk\u00e7a \u00f6nemlidir.<\/p>\n<h3><\/h3>\n<h3><span class=\"ez-toc-section\" id=\"Cozum_Yontemleri\"><\/span>\u00c7\u00f6z\u00fcm Y\u00f6ntemleri<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4><span class=\"ez-toc-section\" id=\"1_ValidateRequest_Ayarini_Kapatmak\"><\/span>1. <strong>ValidateRequest Ayar\u0131n\u0131 Kapatmak<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>ASP.NET\u2019te bu hatay\u0131 engellemenin en basit yolu, <strong>ValidateRequest<\/strong> \u00f6zelli\u011fini kapatmakt\u0131r. Ancak, bu \u00e7\u00f6z\u00fcm dikkatli kullan\u0131lmal\u0131d\u0131r \u00e7\u00fcnk\u00fc form verisinde zararl\u0131 kodlar\u0131n kabul edilmesine neden olabilir.<\/p>\n<p>Web.config dosyas\u0131nda \u015fu sat\u0131r\u0131 ekleyebilirsiniz:<\/p>\n<div class=\"dark bg-gray-950 contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative\">\n<div class=\"flex items-center text-token-text-secondary bg-token-main-surface-secondary px-4 py-2 text-xs font-sans justify-between rounded-t-md h-9\"><strong>&lt;system.web&gt;<\/strong><br \/>\n<strong>&lt;pages validateRequest=&#8221;false&#8221; \/&gt;<\/strong><br \/>\n<strong>&lt;\/system.web&gt;<\/strong><\/div>\n<\/div>\n<p>Ya da yaln\u0131zca belirli bir sayfa i\u00e7in <code>ValidateRequest<\/code> \u00f6zelli\u011fini kapatmak istiyorsan\u0131z:<\/p>\n<div class=\"dark bg-gray-950 contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative\">\n<div class=\"flex items-center text-token-text-secondary bg-token-main-surface-secondary px-4 py-2 text-xs font-sans justify-between rounded-t-md h-9\"><strong>&lt;%@ Page Language=&#8221;C#&#8221; ValidateRequest=&#8221;false&#8221; %&gt;<\/strong><\/div>\n<\/div>\n<p>Bu y\u00f6ntemle, tehlikeli karakterlerin form verisi olarak kabul edilmesine izin verebilirsiniz. Ancak, bu durum sitenizin g\u00fcvenli\u011fi i\u00e7in risk olu\u015fturabilir. Bu nedenle, form verilerini al\u0131rken ve i\u015flerken dikkatli olunmal\u0131d\u0131r.<\/p>\n<p>&nbsp;<\/p>\n<h4><span class=\"ez-toc-section\" id=\"2_RequestValidationMode_Ayarini_Degistirmek\"><\/span>2. <strong>RequestValidationMode Ayar\u0131n\u0131 De\u011fi\u015ftirmek<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>ASP.NET 4.0 ve sonraki s\u00fcr\u00fcmlerde, <code>RequestValidationMode<\/code> ayar\u0131 kullan\u0131larak bu hata kontrol edilebilir. Web.config dosyan\u0131za \u015fu sat\u0131r\u0131 ekleyerek form verilerinde tehlikeli karakterler kabul edilebilir:<\/p>\n<div class=\"dark bg-gray-950 contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative\">\n<div class=\"flex items-center text-token-text-secondary bg-token-main-surface-secondary px-4 py-2 text-xs font-sans justify-between rounded-t-md h-9\"><strong>&lt;system.web&gt;<\/strong><br \/>\n<strong>&lt;httpRuntime requestValidationMode=&#8221;2.0&#8243; \/&gt;<\/strong><br \/>\n<strong>&lt;\/system.web&gt;<\/strong><\/div>\n<\/div>\n<p>Bu ayar ile ASP.NET\u2019in eski versiyonlar\u0131na benzer bir davran\u0131\u015f sergilemesi sa\u011flan\u0131r ve hatay\u0131 \u00f6nler. Yine de form verilerini i\u015fledikten sonra XSS ve benzeri g\u00fcvenlik a\u00e7\u0131klar\u0131na kar\u015f\u0131 koruma sa\u011flaman\u0131z gerekir.<\/p>\n<p>&nbsp;<\/p>\n<h4><span class=\"ez-toc-section\" id=\"3_AllowHtml_Ozelligini_Kullanmak\"><\/span>3. <strong>[AllowHtml] \u00d6zelli\u011fini Kullanmak<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>E\u011fer belirli bir alan\u0131n HTML i\u00e7eri\u011fi kabul etmesini istiyorsan\u0131z, ilgili modele <code>AllowHtml<\/code> \u00f6zelli\u011fini ekleyebilirsiniz. \u00d6rne\u011fin, bir modelde HTML kabul edilmesi gereken bir alan i\u00e7in:<\/p>\n<div class=\"dark bg-gray-950 contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative\">\n<div class=\"flex items-center text-token-text-secondary bg-token-main-surface-secondary px-4 py-2 text-xs font-sans justify-between rounded-t-md h-9\"><strong>public class MyModel<\/strong><br \/>\n<strong>{<\/strong><br \/>\n<strong>[AllowHtml]<\/strong><br \/>\n<strong>public string HtmlContent { get; set; }<\/strong><br \/>\n<strong>}<\/strong><\/div>\n<\/div>\n<p>Bu sayede, sadece bu alan i\u00e7in HTML i\u00e7eri\u011finin kabul edilmesi sa\u011flan\u0131r.<\/p>\n<p>&nbsp;<\/p>\n<h4><span class=\"ez-toc-section\" id=\"4_AntiXSS_Kutuphanesi_Kullanmak\"><\/span>4. <strong>AntiXSS K\u00fct\u00fcphanesi Kullanmak<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>Kullan\u0131c\u0131dan gelen HTML verilerini g\u00fcvenli bir \u015fekilde i\u015flemek i\u00e7in Microsoft\u2019un AntiXSS k\u00fct\u00fcphanesi kullan\u0131labilir. Bu k\u00fct\u00fcphane, HTML i\u00e7eri\u011fini g\u00fcvenli bir \u015fekilde i\u015flemenizi sa\u011flar ve tehlikeli karakterleri temizler.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Guvenlik_Onlemleri\"><\/span>G\u00fcvenlik \u00d6nlemleri<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Bu t\u00fcr hatalar\u0131 \u00e7\u00f6zmek, uygulaman\u0131z\u0131n g\u00fcvenli\u011fini riske atabilir. Bu nedenle, a\u015fa\u011f\u0131daki g\u00fcvenlik \u00f6nlemlerini alman\u0131z \u00f6nemlidir:<\/p>\n<ol>\n<li><strong>XSS Korumas\u0131:<\/strong> Kullan\u0131c\u0131 taraf\u0131ndan g\u00f6nderilen HTML i\u00e7eri\u011fini i\u015flerken, <strong>XSS (Cross-Site Scripting)<\/strong> sald\u0131r\u0131lar\u0131na kar\u015f\u0131 korunmak i\u00e7in ek g\u00fcvenlik katmanlar\u0131 kullan\u0131n.<\/li>\n<li><strong>Girdi Validasyonu:<\/strong> Kullan\u0131c\u0131dan gelen verileri her zaman do\u011frulay\u0131n ve sadece g\u00fcvenli olan i\u00e7erikleri kabul edin.<\/li>\n<li><strong>HTML Encode:<\/strong> Kullan\u0131c\u0131dan gelen i\u00e7erikleri i\u015flerken, m\u00fcmk\u00fcnse HTML encode yaparak zararl\u0131 kodlar\u0131n \u00e7al\u0131\u015fmas\u0131n\u0131 engelleyin.<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p>ASP.NET projelerinde <strong>\u201cA potentially dangerous Request\u201d<\/strong> hatas\u0131, kullan\u0131c\u0131dan gelen form verilerinin g\u00fcvenlik riskleri i\u00e7ermesini engellemek i\u00e7in tasarlanm\u0131\u015f bir mekanizmad\u0131r. Bu hatan\u0131n \u00e7\u00f6z\u00fcm\u00fc i\u00e7in yukar\u0131daki y\u00f6ntemlerden birini kullanabilirsiniz. Ancak, g\u00fcvenli\u011fi riske atmamak i\u00e7in kullan\u0131c\u0131 verilerini i\u015flerken her zaman dikkatli olmal\u0131 ve uygun g\u00fcvenlik \u00f6nlemlerini almal\u0131s\u0131n\u0131z.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>ASP\u2019de \u201cA potentially dangerous Request\u201d Hatas\u0131n\u0131n \u00c7\u00f6z\u00fcm\u00fc ASP.NET projelerinde, kullan\u0131c\u0131 taraf\u0131ndan g\u00f6nderilen bir formda potansiyel olarak tehlikeli karakterler (\u00f6rne\u011fin, &lt;, &gt;, vb.) bulundu\u011funda, &#8220;A potentially dangerous Request.Form value was detected&#8221; hatas\u0131 ile kar\u015f\u0131la\u015fabilirsiniz. Bu hata, genellikle HTML ve JavaScript kodlar\u0131n\u0131n form verisi olarak g\u00f6nderilmesi durumunda ortaya \u00e7\u0131kar ve ASP.NET uygulamalar\u0131n\u0131 bu t\u00fcr zararl\u0131 i\u00e7eriklerden korumak [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2141,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[125],"tags":[10319,10330,10323,10339,10338,10318,10321,10320,10332,10329,10333,10337,10326,10336,10331,10324,10328,10322,10335,10327,10325,10334],"class_list":["post-3555","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-web-yazilim","tag-a-potentially-dangerous-request-hatasi","tag-allowhtml-nedir","tag-asp-form-hatasi-cozumu","tag-asp-hata","tag-asp-request","tag-asp-request-hatasi","tag-asp-tehlikeli-karakterler","tag-asp-validaterequest-cozumu","tag-asp-net-antixss","tag-asp-net-form-gonderme-hatasi","tag-asp-net-girdi-dogrulama","tag-asp-net-guvenlik","tag-asp-net-guvenlik-hatasi","tag-asp-net-hata-cozumu","tag-asp-net-html-encode","tag-html-input-hatasi","tag-request-validation-ayari","tag-request-validation-mode","tag-request-form-hatasi","tag-tehlikeli-request-hatasi-cozumu","tag-validaterequest-kapatma","tag-xss-koruma"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>ASP\u2019de \u201cA potentially dangerous Request\u201d Hatas\u0131n\u0131n \u00c7\u00f6z\u00fcm\u00fc - Vipservis Blog<\/title>\n<meta name=\"description\" content=\"&quot;ASP&#039;de &#039;A potentially dangerous Request&#039; hatas\u0131n\u0131n \u00e7\u00f6z\u00fcm\u00fc i\u00e7in \u00e7e\u015fitli y\u00f6ntemler. 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