{"id":55559,"date":"2025-05-18T16:50:23","date_gmt":"2025-05-18T14:50:23","guid":{"rendered":"https:\/\/iode.tech\/?post_type=docs&#038;p=55559"},"modified":"2025-09-29T11:56:25","modified_gmt":"2025-09-29T09:56:25","password":"","slug":"verrouillage-du-bootloader","status":"publish","type":"docs","link":"https:\/\/iode.tech\/fr\/documentation\/verrouillage-du-bootloader\/","title":{"rendered":"Verrouillage du bootloader"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Qu\u2019est-ce que le bootloader ?<\/h2>\n\n\n\n<p>Le bootloader est le premier programme qui s\u2019ex\u00e9cute au d\u00e9marrage d\u2019un appareil Android. Il initialise le mat\u00e9riel et v\u00e9rifie l\u2019authenticit\u00e9 du syst\u00e8me d\u2019exploitation avant de lui passer le contr\u00f4le. Il d\u00e9cide si le syst\u00e8me peut d\u00e9marrer sur un logiciel fiable ou non.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">D\u00e9verrouillage du bootloader<\/h2>\n\n\n\n<p>D\u00e9verrouiller le bootloader supprime les restrictions du fabricant et permet \u00e0 l\u2019utilisateur d\u2019installer un firmware personnalis\u00e9 (ROM, kernel, recovery, etc.). Cela donne un contr\u00f4le total sur l\u2019appareil, mais r\u00e9duit consid\u00e9rablement la s\u00e9curit\u00e9.<\/p>\n\n\n\n<p>Lorsque le bootloader est d\u00e9verrouill\u00e9 :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>L\u2019appareil peut d\u00e9marrer sur un syst\u00e8me non sign\u00e9 ou modifi\u00e9.<\/li>\n\n\n\n<li>Le Verified Boot est d\u00e9sactiv\u00e9 ou contourn\u00e9.<\/li>\n\n\n\n<li>Une r\u00e9initialisation d\u2019usine est g\u00e9n\u00e9ralement d\u00e9clench\u00e9e pour prot\u00e9ger les donn\u00e9es existantes.<\/li>\n\n\n\n<li>Les protections de chiffrement peuvent \u00eatre compromises si un logiciel malveillant est install\u00e9.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Reverrouillage du bootloader<\/h2>\n\n\n\n<p>Reverrouiller le bootloader r\u00e9tablit les contr\u00f4les de s\u00e9curit\u00e9 d\u2019origine :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>L\u2019appareil ne d\u00e9marre que les firmwares sign\u00e9s num\u00e9riquement par le fabricant.<\/li>\n\n\n\n<li>Le Verified Boot est r\u00e9activ\u00e9 pour garantir l\u2019int\u00e9grit\u00e9 du syst\u00e8me.<\/li>\n\n\n\n<li>Une r\u00e9initialisation d\u2019usine est g\u00e9n\u00e9ralement effectu\u00e9e pour \u00e9liminer tout code ou donn\u00e9e non fiable r\u00e9siduelle.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u00c0 quoi sert Verified Boot ?<\/h2>\n\n\n\n<p>Verified Boot applique une cha\u00eene de confiance depuis le bootloader jusqu\u2019au syst\u00e8me d\u2019exploitation. Il v\u00e9rifie que chaque \u00e9tape du d\u00e9marrage est sign\u00e9e et non modifi\u00e9e. En cas de d\u00e9tection de modification :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>L\u2019appareil peut refuser de d\u00e9marrer ou afficher un avertissement.<\/li>\n\n\n\n<li>Il emp\u00eache le chargement de malwares persistants au d\u00e9marrage.<\/li>\n\n\n\n<li>Il garantit que les donn\u00e9es utilisateur ne sont accessibles que par un logiciel fiable.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Comparaison s\u00e9curit\u00e9 : bootloader verrouill\u00e9 vs d\u00e9verrouill\u00e9<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Aspect<\/th><th>Bootloader verrouill\u00e9<\/th><th>Bootloader d\u00e9verrouill\u00e9<\/th><\/tr><\/thead><tbody><tr><td>V\u00e9rification d\u2019int\u00e9grit\u00e9<\/td><td>Verified Boot activ\u00e9<\/td><td>Contourn\u00e9 ou d\u00e9sactiv\u00e9<\/td><\/tr><tr><td>Modification du syst\u00e8me<\/td><td>Non autoris\u00e9e (images sign\u00e9es)<\/td><td>Autoris\u00e9e (toutes images possibles)<\/td><\/tr><tr><td>ROM personnalis\u00e9es<\/td><td>Interdit<\/td><td>Autoris\u00e9<\/td><\/tr><tr><td>Protection contre alt\u00e9ration<\/td><td>Forte \u2014 alt\u00e9ration bloque le d\u00e9marrage<\/td><td>Faible \u2014 firmware modifi\u00e9 peut d\u00e9marrer<\/td><\/tr><tr><td>S\u00e9curit\u00e9 des cl\u00e9s de chiffrement<\/td><td>\u00c9lev\u00e9e \u2014 li\u00e9e au mat\u00e9riel et OS<\/td><td>Plus faible \u2014 accessible avec OS modifi\u00e9<\/td><\/tr><tr><td>Confiance des applications<\/td><td>Compl\u00e8te \u2014 permet Google Wallet, etc.<\/td><td>Limit\u00e9e \u2014 certaines apps refusent de fonctionner<\/td><\/tr><tr><td>Risque de malware persistant<\/td><td>Faible<\/td><td>\u00c9lev\u00e9 \u2014 firmware malveillant persistant possible<\/td><\/tr><tr><td>R\u00e9initialisation lors de changement<\/td><td>Oui \u2014 d\u00e9verrouillage\/reverrouillage efface les donn\u00e9es<\/td><td>Oui \u2014 d\u00e9verrouillage d\u00e9clenche une r\u00e9initialisation<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Le bootloader d\u00e9verrouill\u00e9 peut-il \u00eatre attaqu\u00e9 \u00e0 distance ?<\/h2>\n\n\n\n<p>Pas directement.<br>Un bootloader d\u00e9verrouill\u00e9 n\u2019introduit pas en soi une vuln\u00e9rabilit\u00e9 \u00e0 distance. Mais il augmente fortement les risques en cas d\u2019attaque locale ou en cha\u00eene :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Risque d\u2019attaque locale<\/strong> : avec un acc\u00e8s physique, un attaquant peut flasher un firmware malveillant, extraire des donn\u00e9es ou contourner la s\u00e9curit\u00e9.<\/li>\n\n\n\n<li><strong>Amplification d\u2019attaque \u00e0 distance<\/strong> : si un appareil est compromis (via malware ou faille zero-day), l\u2019attaquant peut :\n<ul class=\"wp-block-list\">\n<li>Obtenir un acc\u00e8s root plus facilement.<\/li>\n\n\n\n<li>Installer un malware persistant au niveau firmware, normalement bloqu\u00e9 par Verified Boot verrouill\u00e9.<\/li>\n\n\n\n<li>\u00c9viter la d\u00e9tection ou la r\u00e9sistance des contr\u00f4les de s\u00e9curit\u00e9 standards.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>Donc, m\u00eame si un bootloader d\u00e9verrouill\u00e9 n\u2019est pas une vuln\u00e9rabilit\u00e9 distante directe, il aggrave les cons\u00e9quences d\u2019une compromission \u00e0 distance, notamment en termes de persistance et furtivit\u00e9.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Reverrouillage du bootloader dans iod\u00e9OS<\/h2>\n\n\n\n<p>Certains fabricants autorisent le reverrouillage du bootloader, d\u2019autres non.<\/p>\n\n\n\n<p>Ce reverrouillage peut \u00eatre bloqu\u00e9 par des m\u00e9canismes de s\u00e9curit\u00e9 mat\u00e9riels qui emp\u00eachent toute tentative pour \u00e9viter de rendre l\u2019appareil inutilisable (bricking) ou de compromettre son int\u00e9grit\u00e9. De plus, certains fabricants d\u00e9sactivent cette possibilit\u00e9 pour pr\u00e9server la garantie ou appliquer des restrictions propri\u00e9taires.<\/p>\n\n\n\n<p>Vous trouverez <a href=\"https:\/\/iode.tech\/fr\/appareils-pris-en-charge-officiellement-par-iodeos\/\">ici la liste de nos appareils support\u00e9s<\/a> et si nous reverrouillons leur bootloader ou non.<br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Qu\u2019est-ce que le bootloader ? Le bootloader est le premier programme qui s\u2019ex\u00e9cute au d\u00e9marrage d\u2019un appareil Android. Il initialise le mat\u00e9riel et v\u00e9rifie l\u2019authenticit\u00e9 du syst\u00e8me d\u2019exploitation avant de lui passer le contr\u00f4le. Il d\u00e9cide si le syst\u00e8me peut d\u00e9marrer sur un logiciel fiable ou non. D\u00e9verrouillage du bootloader D\u00e9verrouiller le bootloader supprime les &#8230; <a title=\"Verrouillage du bootloader\" class=\"read-more\" href=\"https:\/\/iode.tech\/fr\/documentation\/verrouillage-du-bootloader\/\" aria-label=\"En savoir plus sur Verrouillage du bootloader\">Lire plus<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"doc_category":[105],"doc_tag":[],"class_list":["post-55559","docs","type-docs","status-publish","hentry","doc_category-systeme-et-technologies"],"year_month":"2026-04","word_count":661,"total_views":0,"reactions":{"happy":0,"normal":0,"sad":0},"author_info":{"name":"antoine","author_nicename":"antoine","author_url":"https:\/\/iode.tech\/fr\/author\/antoine\/"},"doc_category_info":[{"term_name":"Syst\u00e8me et technologies","term_url":"https:\/\/iode.tech\/fr\/documentation-category\/systeme-et-technologies\/"}],"doc_tag_info":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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