{"id":27886,"date":"2021-11-10T16:36:00","date_gmt":"2021-11-10T15:36:00","guid":{"rendered":"https:\/\/perseus.de\/vulnerabilites-zero-day-decouvertes-a-nouveau-chez-microsoft\/"},"modified":"2026-03-31T07:31:18","modified_gmt":"2026-03-31T05:31:18","slug":"vulnerabilites-zero-day-decouvertes-a-nouveau-chez-microsoft","status":"publish","type":"post","link":"https:\/\/perseus.de\/fr\/vulnerabilites-zero-day-decouvertes-a-nouveau-chez-microsoft\/","title":{"rendered":"Vuln\u00e9rabilit\u00e9s zero-day d\u00e9couvertes \u00e0 nouveau chez Microsoft"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"27886\" class=\"elementor elementor-27886 elementor-22966\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-dcf4ec4 e-flex e-con-boxed e-con e-parent\" data-id=\"dcf4ec4\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e1db58c elementor-widget elementor-widget-image\" data-id=\"e1db58c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"200\" src=\"https:\/\/perseus.de\/wp-content\/uploads\/2025\/04\/Gefahrenwarnung-Headerbild-Website-2025-1024x256.png\" class=\"attachment-large size-large wp-image-27802\" alt=\"\" srcset=\"https:\/\/perseus.de\/wp-content\/uploads\/2025\/04\/Gefahrenwarnung-Headerbild-Website-2025-1024x256.png 1024w, https:\/\/perseus.de\/wp-content\/uploads\/2025\/04\/Gefahrenwarnung-Headerbild-Website-2025-300x75.png 300w, https:\/\/perseus.de\/wp-content\/uploads\/2025\/04\/Gefahrenwarnung-Headerbild-Website-2025-768x192.png 768w, https:\/\/perseus.de\/wp-content\/uploads\/2025\/04\/Gefahrenwarnung-Headerbild-Website-2025.png 1200w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1258a43 e-flex e-con-boxed e-con e-parent\" data-id=\"1258a43\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-2de4e88 e-con-full e-flex e-con e-child\" data-id=\"2de4e88\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4982c80 elementor-widget elementor-widget-text-editor\" data-id=\"4982c80\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h6>10.11.2021<\/h6>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8348bc5 elementor-widget elementor-widget-heading\" data-id=\"8348bc5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Vuln\u00e9rabilit\u00e9s zero-day d\u00e9couvertes \u00e0 nouveau chez Microsoft\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-eb03842 e-con-full e-flex e-con e-child\" data-id=\"eb03842\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-91d0988 elementor-widget elementor-widget-text-editor\" data-id=\"91d0988\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>En raison des vuln\u00e9rabilit\u00e9s de s\u00e9curit\u00e9 zero-day pour Microsoft Exchance Server, entre autres, une nouvelle vague d\u2019attaques sur les serveurs Microsoft Exchange non corrig\u00e9s existe en r\u00e9alit\u00e9. Vous trouverez ci-dessous des informations suppl\u00e9mentaires et des informations sur la mani\u00e8re de g\u00e9rer l\u2019attaque. <\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f85a5ad e-flex e-con-boxed e-con e-parent\" data-id=\"f85a5ad\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-fad2031 e-con-full e-flex e-con e-child\" data-id=\"fad2031\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8282d30 elementor-widget elementor-widget-text-editor\" data-id=\"8282d30\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Que s\u2019est-il pass\u00e9 ?<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ee744d2 e-con-full e-flex e-con e-child\" data-id=\"ee744d2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5ea6506 elementor-widget elementor-widget-text-editor\" data-id=\"5ea6506\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Le 9 novembre 2021,<a href=\"https:\/\/threatpost.com\/microsoft-nov-patch-tuesday-fixes-six-zero-days-55-bugs\/176143\/\"> 55 correctifs ont \u00e9t\u00e9 publi\u00e9s pour Microsoft<\/a>, dont six sont critiques. En f\u00e9vrier et mars, des vuln\u00e9rabilit\u00e9s zero-day dans les serveurs Microsoft Exchange ont \u00e9t\u00e9 exploit\u00e9es par des attaquants pour acc\u00e9der aux serveurs. Actuellement, deux vuln\u00e9rabilit\u00e9s zero-day ont de nouveau \u00e9t\u00e9 d\u00e9couvertes, dont l\u2019une pour Microsoft Exchange Server.  <\/p><p>La <a href=\"https:\/\/krebsonsecurity.com\/2021\/11\/microsoft-patch-tuesday-november-2021-edition\/\">vuln\u00e9rabilit\u00e9 zero-day CVE-2021-42321<\/a> est localis\u00e9e dans les serveurs Microsoft Exchange et n\u00e9cessite une action imm\u00e9diate car elle est d\u00e9j\u00e0 activement exploit\u00e9e par les attaquants. L\u2019\u00e9quipe de cybers\u00e9curit\u00e9 de Perseus vous conseille vivement d\u2019installer imm\u00e9diatement les correctifs de s\u00e9curit\u00e9 disponibles. <\/p><p>La <a href=\"https:\/\/krebsonsecurity.com\/2021\/11\/microsoft-patch-tuesday-november-2021-edition\/\">vuln\u00e9rabilit\u00e9 CVE-2021-42292<\/a> permet de contourner les fonctionnalit\u00e9s de s\u00e9curit\u00e9 dans les versions Microsoft Excel 2013-2021. Les attaquants pouvaient donc installer du code malveillant. Il suffit de faire t\u00e9l\u00e9charger aux utilisateurs des fichiers Excel manipul\u00e9s \u2013 par exemple, via des emails de phishing.  <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f1dfa8e e-flex e-con-boxed e-con e-parent\" data-id=\"f1dfa8e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bf4f09a elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"bf4f09a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a82985c e-flex e-con-boxed e-con e-parent\" data-id=\"a82985c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-482032b e-con-full e-flex e-con e-child\" data-id=\"482032b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b5f6a5c elementor-widget elementor-widget-text-editor\" data-id=\"b5f6a5c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>CVE-2021-42321 : Par des experts pour des experts<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8f5d6ed e-con-full e-flex e-con e-child\" data-id=\"8f5d6ed\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-057f5b5 elementor-widget elementor-widget-text-editor\" data-id=\"057f5b5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>La vuln\u00e9rabilit\u00e9 zero-day CVE-2021-42321 est une vuln\u00e9rabilit\u00e9 critique d\u2019ex\u00e9cution de code \u00e0 distance (RCE) dans Exchange Server caus\u00e9e par des probl\u00e8mes de validation des arguments commandlets (cmdlet) \u2013 c\u2019est-\u00e0-dire des commandes l\u00e9g\u00e8res utilis\u00e9es dans l\u2019environnement PowerShell. Ils sont invoqu\u00e9s par l\u2019ex\u00e9cution PowerShell dans le contexte de scripts d\u2019automatisation d\u00e9ploy\u00e9s depuis la ligne de commande ou programmatiquement invoqu\u00e9s par l\u2019ex\u00e9cution PowerShell via des API. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6237d73 e-flex e-con-boxed e-con e-parent\" data-id=\"6237d73\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9dde6dc elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"9dde6dc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-02dd0e9 e-flex e-con-boxed e-con e-parent\" data-id=\"02dd0e9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-16d621d e-con-full e-flex e-con e-child\" data-id=\"16d621d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-89904c7 elementor-widget elementor-widget-text-editor\" data-id=\"89904c7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Quels sont les dangers pour votre entreprise ?<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-fae461d e-con-full e-flex e-con e-child\" data-id=\"fae461d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0f04793 elementor-widget elementor-widget-text-editor\" data-id=\"0f04793\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Ces vuln\u00e9rabilit\u00e9s sont d\u00e9j\u00e0 exploit\u00e9es par des cybercriminels. Ils permettent aux attaquants d\u2019implanter des webshells et d\u2019ex\u00e9cuter des commandes \u00e0 distance, en r\u00e9sum\u00e9 : ex\u00e9cuter activement des commandes sur les ordinateurs compromis pour installer des logiciels malveillants ou des ransomwares et espionner des donn\u00e9es sensibles. Par exemple, les emails de r\u00e9ponse sont envoy\u00e9s depuis des comptes personnels contenant des liens malveillants.  <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-cdadbd8 e-flex e-con-boxed e-con e-parent\" data-id=\"cdadbd8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-104dd95 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"104dd95\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f6e5251 e-flex e-con-boxed e-con e-parent\" data-id=\"f6e5251\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-f1cf26c e-con-full e-flex e-con e-child\" data-id=\"f1cf26c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ee082fd elementor-widget elementor-widget-text-editor\" data-id=\"ee082fd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Que puis-je faire ?<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-bc25934 e-con-full e-flex e-con e-child\" data-id=\"bc25934\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2b46b6f elementor-widget elementor-widget-text-editor\" data-id=\"2b46b6f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>Microsoft a publi\u00e9 <a href=\"https:\/\/msrc.microsoft.com\/update-guide\/vulnerability\/CVE-2021-42321\">quatre correctifs class\u00e9s comme importants<\/a> pour corriger ces vuln\u00e9rabilit\u00e9s. V\u00e9rifiez si ce correctif est d\u00e9j\u00e0 install\u00e9 sur votre serveur Microsoft Exchange. Sinon, faites-le imm\u00e9diatement. En raison de la rapidit\u00e9 de la propagation, la rapidit\u00e9 de cette mise en \u0153uvre est cruciale pour \u00e9viter des d\u00e9g\u00e2ts cybern\u00e9tiques majeurs et cumulatifs.   <\/li><li>Gardez votre syst\u00e8me \u00e0 jour. Nous recommandons d\u2019utiliser toutes les mises \u00e0 jour automatiques. <\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>10.11.2021 Vuln\u00e9rabilit\u00e9s zero-day d\u00e9couvertes \u00e0 nouveau chez Microsoft En raison des vuln\u00e9rabilit\u00e9s de s\u00e9curit\u00e9 zero-day pour Microsoft Exchance Server, entre autres, une nouvelle vague d\u2019attaques sur les serveurs Microsoft Exchange non corrig\u00e9s existe en r\u00e9alit\u00e9. Vous trouverez ci-dessous des informations suppl\u00e9mentaires et des informations sur la mani\u00e8re de g\u00e9rer l\u2019attaque. Que s\u2019est-il pass\u00e9 ? Le [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[65],"tags":[],"class_list":["post-27886","post","type-post","status-publish","format-standard","hentry","category-alerte-aux-dangers"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Vuln\u00e9rabilit\u00e9s zero-day d\u00e9couvertes \u00e0 nouveau chez Microsoft - Perseus Technologies<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/perseus.de\/fr\/vulnerabilites-zero-day-decouvertes-a-nouveau-chez-microsoft\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Vuln\u00e9rabilit\u00e9s zero-day d\u00e9couvertes \u00e0 nouveau chez Microsoft - Perseus Technologies\" \/>\n<meta property=\"og:description\" content=\"10.11.2021 Vuln\u00e9rabilit\u00e9s zero-day d\u00e9couvertes \u00e0 nouveau chez Microsoft En raison des vuln\u00e9rabilit\u00e9s de s\u00e9curit\u00e9 zero-day pour Microsoft Exchance Server, entre autres, une nouvelle vague d\u2019attaques sur les serveurs Microsoft Exchange non corrig\u00e9s existe en r\u00e9alit\u00e9. Vous trouverez ci-dessous des informations suppl\u00e9mentaires et des informations sur la mani\u00e8re de g\u00e9rer l\u2019attaque. Que s\u2019est-il pass\u00e9 ? 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