{"id":25122,"date":"2026-08-04T12:59:15","date_gmt":"2026-08-04T12:59:15","guid":{"rendered":"https:\/\/windowsreport.com\/fr\/un-malware-peut-voler-des-google-passkeys-a-laide-dattaques-pass-ta-key\/"},"modified":"2026-08-04T12:59:15","modified_gmt":"2026-08-04T12:59:15","slug":"un-malware-peut-voler-des-google-passkeys-a-laide-dattaques-pass-ta-key","status":"publish","type":"post","link":"https:\/\/windowsreport.com\/fr\/un-malware-peut-voler-des-google-passkeys-a-laide-dattaques-pass-ta-key\/","title":{"rendered":"Un malware peut voler des Google Passkeys \u00e0 l\u2019aide d\u2019attaques Pass-ta-key"},"content":{"rendered":"\n

Les attaques Pass-ta-key peuvent permettre \u00e0 un logiciel malveillant d\u2019abuser de Google Password Manager et de d\u00e9tourner les cl\u00e9s d\u2019acc\u00e8s stock\u00e9es via Chrome sous Windows. Ces attaques ne cassent pas le chiffrement des cl\u00e9s d\u2019acc\u00e8s, mais exploitent des faiblesses dans l\u2019enregistrement, la r\u00e9cup\u00e9ration, la synchronisation et les v\u00e9rifications de confiance des appareils.<\/p>\n\n\n\n

L\u2019unit\u00e9 Unit 42 de Palo Alto Networks a d\u00e9couvert trois attaques<\/a> affectant les cl\u00e9s d\u2019acc\u00e8s synchronis\u00e9es via Google Password Manager. Les chercheurs ont collectivement baptis\u00e9 ces techniques Pass-ta-key.<\/p>\n\n\n\n

Les trois attaques n\u00e9cessitent qu\u2019un logiciel malveillant soit d\u00e9j\u00e0 en cours d\u2019ex\u00e9cution sur l\u2019ordinateur Windows de la victime. Cependant, certaines techniques fonctionnent sans autorisations d\u2019administrateur ni interaction suppl\u00e9mentaire de l\u2019utilisateur.<\/p>\n\n\n\n

Un logiciel malveillant peut usurper l\u2019identit\u00e9 d\u2019un appareil Windows de confiance<\/h2>\n\n\n\n

La premi\u00e8re technique Pass-ta-key permet \u00e0 un logiciel malveillant d\u2019usurper l\u2019identit\u00e9 d\u2019un appareil Windows que Google consid\u00e8re d\u00e9j\u00e0 comme fiable.<\/p>\n\n\n\n

Le logiciel malveillant abuse de la cl\u00e9 d\u2019identit\u00e9 d\u2019appareil adoss\u00e9e au TPM de Chrome pour demander une r\u00e9ponse d\u2019authentification valide aupr\u00e8s de l\u2019authentificateur cloud de Google. Le processus peut se d\u00e9rouler sans biom\u00e9trie, sans code PIN, sans approbation de l\u2019utilisateur, ni m\u00eame d\u00e9verrouillage de l\u2019ordinateur.<\/p>\n\n\n\n

Google peut alors renvoyer une assertion de cl\u00e9 d\u2019acc\u00e8s sign\u00e9e que l\u2019attaquant peut utiliser pour acc\u00e9der au compte cibl\u00e9.<\/p>\n\n\n\n

Les assertions de cl\u00e9 d\u2019acc\u00e8s contiennent un indicateur de v\u00e9rification de l\u2019utilisateur qui indique si ce dernier a approuv\u00e9 la connexion par un code PIN ou une v\u00e9rification biom\u00e9trique. Les sites web peuvent bloquer cette attaque s\u2019ils exigent la v\u00e9rification de l\u2019utilisateur et valident correctement cet indicateur.<\/p>\n\n\n\n

Silver Pass-ta-key ajoute une cl\u00e9 contr\u00f4l\u00e9e par l\u2019attaquant<\/h3>\n\n\n\n

La deuxi\u00e8me technique, appel\u00e9e Silver Pass-ta-key, permet aux attaquants d\u2019enregistrer leur propre cl\u00e9 de v\u00e9rification aupr\u00e8s de l\u2019authentificateur cloud de Google.<\/p>\n\n\n\n

Le logiciel malveillant supprime ou invalide d\u2019abord l\u2019\u00e9tat existant de la cl\u00e9 d\u2019acc\u00e8s de Chrome, for\u00e7ant le navigateur \u00e0 r\u00e9p\u00e9ter son processus d\u2019enregistrement de l\u2019appareil. Lors de l\u2019enregistrement, l\u2019attaquant soumet une cl\u00e9 de v\u00e9rification qu\u2019il contr\u00f4le.<\/p>\n\n\n\n

Selon Unit 42, le syst\u00e8me de Google n\u2019a pas v\u00e9rifi\u00e9 si la cl\u00e9 de remplacement provenait d\u2019un mat\u00e9riel de confiance.<\/p>\n\n\n\n

Une fois que Google accepte la cl\u00e9 malveillante, les attaquants peuvent l\u2019utiliser comme preuve que la victime a approuv\u00e9 une demande d\u2019authentification. Cette technique peut contourner les services qui exigent correctement un code PIN ou une v\u00e9rification biom\u00e9trique.<\/p>\n\n\n\n

L\u2019attaquant peut \u00e9galement s\u2019authentifier plus tard depuis un autre appareil. Il n\u2019a plus besoin d\u2019un acc\u00e8s continu \u00e0 l\u2019ordinateur compromis d\u2019origine.<\/p>\n\n\n\n

Golden Pass-ta-key expose le secret principal des cl\u00e9s d\u2019acc\u00e8s<\/h3>\n\n\n\n

La technique la plus grave, Golden Pass-ta-key, cible le secret du domaine de s\u00e9curit\u00e9 utilis\u00e9 pour chiffrer toutes les cl\u00e9s d\u2019acc\u00e8s synchronis\u00e9es via Google Password Manager.<\/p>\n\n\n\n

Google fournit temporairement ce secret principal \u00e0 Chrome lors de l\u2019enregistrement de l\u2019appareil ou de la r\u00e9cup\u00e9ration du compte. Unit 42 a d\u2019abord trouv\u00e9 le secret stock\u00e9 en clair dans les journaux FIDO de Chrome.<\/p>\n\n\n\n

Google a supprim\u00e9 la valeur de ces journaux apr\u00e8s que les chercheurs ont divulgu\u00e9 le probl\u00e8me.<\/p>\n\n\n\n

Cependant, Unit 42 indique que le secret appara\u00eet encore temporairement dans la m\u00e9moire du processus Chrome. Un logiciel malveillant peut d\u00e9clencher le r\u00e9enregistrement de l\u2019appareil et rechercher la cl\u00e9 de chiffrement dans la m\u00e9moire du navigateur.<\/p>\n\n\n\n

Apr\u00e8s avoir extrait le secret, les attaquants peuvent d\u00e9chiffrer les enregistrements de cl\u00e9s d\u2019acc\u00e8s synchronis\u00e9es et acc\u00e9der \u00e0 leurs cl\u00e9s priv\u00e9es. Ils peuvent ensuite transf\u00e9rer ces cl\u00e9s vers un autre appareil et usurper l\u2019identit\u00e9 de la victime.<\/p>\n\n\n\n

Le secret vol\u00e9 peut \u00e9galement d\u00e9chiffrer les cl\u00e9s d\u2019acc\u00e8s ajout\u00e9es ult\u00e9rieurement au compte. Les chercheurs ont rapport\u00e9 que l\u2019impl\u00e9mentation de Google n\u2019offre actuellement aucun moyen de faire tourner ou de r\u00e9voquer le secret du domaine de s\u00e9curit\u00e9.<\/p>\n\n\n\n

Cela signifie que les attaquants pourraient conserver l\u2019acc\u00e8s aux cl\u00e9s d\u2019acc\u00e8s synchronis\u00e9es existantes et futures apr\u00e8s avoir vol\u00e9 la cl\u00e9.<\/p>\n\n\n\n

Les cl\u00e9s d\u2019acc\u00e8s d\u00e9pendent toujours de la s\u00e9curit\u00e9 de l\u2019appareil<\/h3>\n\n\n\n

Unit 42 a signal\u00e9 en priv\u00e9 les faiblesses de Google Password Manager \u00e0 Google avant de publier ses recherches. Google n\u2019a pas confirm\u00e9 publiquement s\u2019il avait enti\u00e8rement r\u00e9solu toutes les techniques d\u00e9crites.<\/p>\n\n\n\n

Les recherches montrent que les cl\u00e9s d\u2019acc\u00e8s peuvent encore devenir vuln\u00e9rables lorsqu\u2019un logiciel malveillant compromet l\u2019appareil qui les g\u00e8re. Bien que Microsoft pousse les utilisateurs vers les cl\u00e9s d\u2019acc\u00e8s, l\u2019authentification sans mot de passe ne peut pas prot\u00e9ger enti\u00e8rement les comptes lorsque les attaquants contr\u00f4lent le navigateur ou le syst\u00e8me d\u2019exploitation.<\/p>\n\n\n\n

Les sites web devraient exiger la v\u00e9rification de l\u2019utilisateur et valider l\u2019indicateur de cl\u00e9 d\u2019acc\u00e8s correspondant. Les gestionnaires d\u2019informations d\u2019identification devraient \u00e9galement confirmer que les cl\u00e9s d\u2019appareil nouvellement enregistr\u00e9es proviennent d\u2019un mat\u00e9riel de confiance.<\/p>\n\n\n\n

Les d\u00e9veloppeurs devraient renforcer les processus de r\u00e9cup\u00e9ration et de r\u00e9enregistrement des appareils tout en limitant la dur\u00e9e pendant laquelle les cl\u00e9s de chiffrement sensibles restent disponibles dans la m\u00e9moire du navigateur.<\/p>\n\n\n\n

Les utilisateurs doivent continuer \u00e0 installer les mises \u00e0 jour de s\u00e9curit\u00e9, \u00e0 \u00e9viter les t\u00e9l\u00e9chargements suspects et \u00e0 prot\u00e9ger leurs ordinateurs contre les logiciels malveillants. Google a \u00e9galement introduit la r\u00e9cup\u00e9ration de compte par vid\u00e9o selfie avec protections contre les hypertrucages dans le cadre de ses efforts plus larges de s\u00e9curit\u00e9 des comptes.<\/p>\n\n\n\n

La s\u00e9curit\u00e9 des appareils reste particuli\u00e8rement importante lors de l\u2019utilisation de r\u00e9seaux publics. Microsoft a r\u00e9cemment d\u00e9couvert une campagne mondiale de logiciels malveillants via le Wi-Fi des h\u00f4tels qui ciblait les voyageurs par le biais de portails captifs compromis.<\/p>\n\n\n\n

Via BleepingComputer<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Les attaques Pass-ta-key peuvent permettre \u00e0 un logiciel malveillant d\u2019abuser de Google Password Manager et de d\u00e9tourner les cl\u00e9s d\u2019acc\u00e8s stock\u00e9es via Chrome sous Windows. Ces attaques ne cassent pas le chiffrement des cl\u00e9s d\u2019acc\u00e8s, mais exploitent des faiblesses dans l\u2019enregistrement, la r\u00e9cup\u00e9ration, la synchronisation et les v\u00e9rifications de confiance des appareils. L\u2019unit\u00e9 Unit 42 […]<\/p>\n","protected":false},"author":49,"featured_media":25123,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_enabled_clarity":"","footnotes":""},"categories":[1019],"tags":[],"work":[],"class_list":["post-25122","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutoriels"],"acf":[],"yoast_head":"\nUn malware peut voler des Google Passkeys \u00e0 l\u2019aide d\u2019attaques Pass-ta-key<\/title>\n<meta name=\"description\" content=\"Les attaques Pass-ta-key permettent \u00e0 des malwares de d\u00e9tourner les passkeys synchronis\u00e9es via Google en abusant des syst\u00e8mes de confiance des appareils, de r\u00e9cup\u00e9ration et de synchronisation de Chrome\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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