{"id":100021,"date":"2021-04-25T10:22:49","date_gmt":"2021-04-25T08:22:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-git-dlya-cygwin-pozvolyayushhaya-organizovat-vypolnenie-koda"},"modified":"2021-04-25T10:22:49","modified_gmt":"2021-04-25T08:22:49","slug":"uyazvimost-v-git-dlya-cygwin-pozvolyayushhaya-organizovat-vypolnenie-koda","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/uyazvimost-v-git-dlya-cygwin-pozvolyayushhaya-organizovat-vypolnenie-koda","title":{"rendered":"Vuln\u00e9rabilit\u00e9 dans Git pour Cygwin permettant l'ex\u00e9cution de code","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Une vuln\u00e9rabilit\u00e9 critique a \u00e9t\u00e9 identifi\u00e9e dans Git (CVE-2021-29468), se manifestant uniquement lors de la compilation pour l'environnement Cygwin (une biblioth\u00e8que pour l'\u00e9mulation de l'API Linux de base sous Windows et un ensemble de programmes type Linux pour Windows). Cette vuln\u00e9rabilit\u00e9 permet \u00e0 un attaquant d'ex\u00e9cuter du code malveillant lors de l'extraction de donn\u00e9es (\u00ab git checkout \u00bb) d'un d\u00e9p\u00f4t contr\u00f4l\u00e9 par l'agresseur. Le probl\u00e8me a \u00e9t\u00e9 corrig\u00e9 dans le paquet git 2.31.1-2 pour Cygwin. Dans le projet principal de Git, le probl\u00e8me n'est pas encore r\u00e9solu (il est peu probable que quelqu'un compile Git pour Cygwin manuellement, plut\u00f4t que d'utiliser un paquet pr\u00eat \u00e0 l'emploi). <\/p>\n

La vuln\u00e9rabilit\u00e9 est caus\u00e9e par le traitement de l'environnement Cygwin comme un syst\u00e8me de type Unix, et non Windows, ce qui entra\u00eene l'absence de restrictions sur l'utilisation du caract\u00e8re \u2018\\\u2019 dans le chemin. En fait, dans Cygwin, comme en Windows, ce caract\u00e8re peut \u00eatre utilis\u00e9 pour s\u00e9parer des r\u00e9pertoires. En cons\u00e9quence, en cr\u00e9ant un d\u00e9p\u00f4t sp\u00e9cialement modifi\u00e9, contenant des liens symboliques et des fichiers avec le caract\u00e8re de barre oblique invers\u00e9e, il est possible d'\u00e9craser des fichiers arbitraires lors du chargement de ce d\u00e9p\u00f4t dans Cygwin (une vuln\u00e9rabilit\u00e9 similaire dans Git pour Windows a \u00e9t\u00e9 corrig\u00e9e en 2019). En ayant la capacit\u00e9 de remplacer des fichiers, un attaquant peut red\u00e9finir les appels de hook dans Git et aboutir \u00e0 l'ex\u00e9cution de code arbitraire dans le syst\u00e8me.
\n
Source : opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 Git \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-29468), \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u044e\u0449\u0430\u044f\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u0440\u0438 \u0441\u0431\u043e\u0440\u043a\u0435 \u0434\u043b\u044f \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f Cygwin (\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 \u0434\u043b\u044f \u044d\u043c\u0443\u043b\u044f\u0446\u0438\u0438 \u0431\u0430\u0437\u043e\u0432\u043e\u0433\u043e Linux API \u0432 Windows \u0438 \u043d\u0430\u0431\u043e\u0440 \u0442\u0438\u043f\u043e\u0432\u044b\u0445 linux-\u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c \u0434\u043b\u044f Windows). \u0423\u044f\u0432\u0437\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0430 \u043f\u0440\u0438 \u0438\u0437\u0432\u043b\u0435\u0447\u0435\u043d\u0438\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 («git checkout») \u0438\u0437 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u044f, \u043f\u043e\u0434\u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c\u043d\u043e\u0433\u043e \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u043c\u0443. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u043f\u0430\u043a\u0435\u0442\u0435 git 2.31.1-2 \u0434\u043b\u044f Cygwin. \u0412 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u043c \u043f\u0440\u043e\u0435\u043a\u0442\u0435 Git \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u043e\u043a\u0430 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-100021","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Vuln\u00e9rabilit\u00e9 dans Git pour Cygwin, permettant d'organiser l'ex\u00e9cution de code | ProHoster","description":"Une vuln\u00e9rabilit\u00e9 critique a \u00e9t\u00e9 identifi\u00e9e dans Git (CVE-2021-29468), qui se manifeste uniquement lors de la compilation pour l'environnement Cygwin (une biblioth\u00e8que pour l'\u00e9mulation de l'API Linux de base sous Windows et un ensemble de programmes Linux typiques pour Windows).","canonical_url":"https:\/\/prohoster.info\/fr\/blog\/news\/uyazvimost-v-git-dlya-cygwin-pozvolyayushhaya-organizovat-vypolnenie-koda","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"fr_FR","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 Git \u0434\u043b\u044f Cygwin, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043a\u043e\u0434\u0430 | ProHoster","og:description":"\u0412 Git \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-29468), \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u044e\u0449\u0430\u044f\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u0440\u0438 \u0441\u0431\u043e\u0440\u043a\u0435 \u0434\u043b\u044f \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f Cygwin (\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 \u0434\u043b\u044f \u044d\u043c\u0443\u043b\u044f\u0446\u0438\u0438 \u0431\u0430\u0437\u043e\u0432\u043e\u0433\u043e Linux API \u0432 Windows \u0438 \u043d\u0430\u0431\u043e\u0440 \u0442\u0438\u043f\u043e\u0432\u044b\u0445 linux-\u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c \u0434\u043b\u044f Windows).","og:url":"https:\/\/prohoster.info\/fr\/blog\/news\/uyazvimost-v-git-dlya-cygwin-pozvolyayushhaya-organizovat-vypolnenie-koda","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2021-04-25T08:22:49+00:00","article:modified_time":"2021-04-25T08:22:49+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"100021","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":null,"schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":null,"breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2021-04-25 08:48:47","updated":"2022-10-05 17:52:47","focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/posts\/100021","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/comments?post=100021"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/posts\/100021\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/media?parent=100021"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/categories?post=100021"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/fr\/wp-json\/wp\/v2\/tags?post=100021"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}