{"id":201246,"date":"2013-12-19T13:20:00","date_gmt":"2013-12-19T12:20:00","guid":{"rendered":"https:\/\/cms.galaxiemedia.fr\/tomshardware\/2013\/12\/19\/un-hack-pour-activer-une-webcam-sans-indicateur-visuel\/"},"modified":"2023-06-22T16:18:39","modified_gmt":"2023-06-22T14:18:39","slug":"un-hack-pour-activer-une-webcam-sans-indicateur-visuel","status":"publish","type":"post","link":"https:\/\/www.tomshardware.fr\/un-hack-pour-activer-une-webcam-sans-indicateur-visuel\/","title":{"rendered":"Un hack pour activer une webcam sans indicateur visuel"},"content":{"rendered":"<p><span class=\"imgContent imgRight\"><span class=\"iZoom\"><img alt=\"Image 1 : Un hack pour activer une webcam sans indicateur visuel\" decoding=\"async\" width=\"200\" height=\"132\" src=\"https:\/\/www.tomshardware.fr\/content\/uploads\/sites\/3\/2013\/12\/capture-d-ecran-2013-12-19-a-12-16-32-200x132.png\" class=\"attachment-purch-200 size-purch-200\" alt=\"\" \/><\/span><\/span><\/p>\n<\/p>\n<p>Dans un ordinateur portable, la webcam utilise souvent une technique simple pour indiquer qu&#8217;elle est activ\u00e9e : une LED. Si quelques marques proposent une v\u00e9ritable protection physique (avec un clapet \u00e0 activer manuellement), dans la majorit\u00e9 des cas, on a donc juste une LED. Et des \u00e9tudiants viennent de montrer que m\u00eame si la gestion de la LED est mat\u00e9rielle, il est tout de m\u00eame possible d&#8217;activer la webcam dans certains cas&#8230; sans allumer cette LED.<\/p>\n<\/p>\n<h3>Reprogrammer le firmware<\/h3>\n<\/p>\n<p>Les chercheurs ont travaill\u00e9 sur la webcam utilis\u00e9e dans les appareils Apple entre 2005 et 2008 environ. On retrouve en effet le m\u00eame mod\u00e8le dans les iMac G5, plusieurs iMac Intel, les MacBook et les MacBook Pro. Dans tous les cas, c&#8217;est le m\u00eame module de contr\u00f4le qui est utilis\u00e9, et il est possible de le reprogrammer. Les \u00e9tudiants ont donc cod\u00e9 un petit programme \u2014 qui n&#8217;est pas public \u2014 capable de reprogrammer le firmware de la webcam au lancement, en d\u00e9sactivant la LED de la webcam. Quand on quitte le programme, le firmware original est remis en place. <\/p>\n<\/p>\n<p>Cette attaque permet aussi d&#8217;effectuer une attaque depuis une machine virtuelle. En reprogrammant la webcam depuis une machine virtuelle, en envoyant un firmware \u00e9mulant un clavier (ou une souris), il est en effet possible de passer sur l&#8217;h\u00f4te. L&#8217;id\u00e9e est simple : quand on reprogramme la webcam, le programme de virtualisation consid\u00e8re (avec raison) qu&#8217;il s&#8217;agit d&#8217;un nouveau p\u00e9riph\u00e9rique USB et le connecte donc \u00e0 la machine h\u00f4te. Ensuite, la webcam reprogramm\u00e9e peut envoyer des commandes directement \u00e0 l&#8217;h\u00f4te (lancer un programme dans l&#8217;exemple).<\/p>\n<\/p>\n<p>Les \u00e9tudiants proposent un petit programme qui emp\u00eache la reprogrammation de la webcam par un utilisateur et ne fournissent pas les logiciels utilis\u00e9s pour passer outre la LED. \u00c0 noter que s&#8217;ils ont utilis\u00e9 Mac OS X sur d&#8217;anciennes machines, beaucoup de mod\u00e8les de webcam sont vuln\u00e9rables, la puce de contr\u00f4le utilis\u00e9e \u00e9tant assez courante.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dans un ordinateur portable, la webcam utilise souvent une technique simple pour indiquer qu'elle est activ\u00e9e : une LED.<\/p>","protected":false},"author":36,"featured_media":201247,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ep_exclude_from_search":false,"footnotes":""},"categories":[487,4112],"tags":[576],"hubs":[],"acf":{"post_show_excerpt":false,"post_source":{"title":"Webcam hack","url":"https:\/\/jscholarship.library.jhu.edu\/bitstream\/handle\/1774.2\/36569\/camera.pdf?sequence=1","target":""}},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v22.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Un hack pour activer une webcam sans indicateur visuel<\/title>\n<meta name=\"description\" content=\"Dans un ordinateur portable, la webcam utilise souvent une technique simple pour indiquer qu&#039;elle est activ\u00e9e : une LED.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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