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 nomm\u00e9 ces techniques Pass-ta-key.<\/p>\n\n\n\nCes trois attaques exigent qu\u2019un logiciel malveillant soit d\u00e9j\u00e0 en cours d\u2019ex\u00e9cution sur l\u2019ordinateur Windows de la victime. Certaines techniques fonctionnent toutefois sans privil\u00e8ges d\u2019administrateur ni interaction suppl\u00e9mentaire de l\u2019utilisateur.<\/p>\n\n\n\n
Un logiciel malveillant peut usurper un 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 la cl\u00e9 d\u2019identit\u00e9 de l\u2019appareil sauvegard\u00e9e par le TPM dans Chrome pour demander une r\u00e9ponse d\u2019authentification valide \u00e0 l\u2019authentificateur cloud de Google. Le processus peut se d\u00e9rouler sans biom\u00e9trie, code PIN, 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 utilisateur qui signale si l\u2019utilisateur a approuv\u00e9 la connexion par un code PIN ou un contr\u00f4le biom\u00e9trique. Les sites web peuvent bloquer cette attaque lorsqu\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, nomm\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 des cl\u00e9s d\u2019acc\u00e8s dans Chrome, for\u00e7ant le navigateur \u00e0 r\u00e9p\u00e9ter son processus d\u2019enregistrement de l\u2019appareil. Pendant 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 une v\u00e9rification par code PIN ou biom\u00e9trique.<\/p>\n\n\n\n
L\u2019attaquant peut aussi s\u2019authentifier ult\u00e9rieurement depuis un autre appareil. Il n\u2019a plus besoin d\u2019un acc\u00e8s continu \u00e0 l\u2019ordinateur compromis initial.<\/p>\n\n\n\n
Golden Pass-ta-key expose le secret ma\u00eetre 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 ma\u00eetre \u00e0 Chrome lors de l\u2019enregistrement de l\u2019appareil ou de la r\u00e9cup\u00e9ration du compte. Unit 42 a initialement constat\u00e9 que le secret \u00e9tait stock\u00e9 en clair dans les journaux FIDO de Chrome.<\/p>\n\n\n\n
Google a retir\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 toujours temporairement dans la m\u00e9moire du processus de Chrome. Un logiciel malveillant peut d\u00e9clencher un r\u00e9enregistrement de l\u2019appareil et chercher 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 sur un autre appareil et usurper l\u2019identit\u00e9 de la victime.<\/p>\n\n\n\n
Le secret vol\u00e9 pourrait \u00e9galement d\u00e9chiffrer les cl\u00e9s d\u2019acc\u00e8s ajout\u00e9es ult\u00e9rieurement au compte. Les chercheurs signalent que l\u2019impl\u00e9mentation de Google n\u2019offre actuellement aucun moyen de faire pivoter 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 \u00e0 la fois aux cl\u00e9s d\u2019acc\u00e8s synchronis\u00e9es existantes et futures apr\u00e8s avoir d\u00e9rob\u00e9 la cl\u00e9.<\/p>\n\n\n\n
Les cl\u00e9s d\u2019acc\u00e8s d\u00e9pendent encore 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 chaque technique d\u00e9crite.<\/p>\n\n\n\n
Ces recherches montrent que les cl\u00e9s d\u2019acc\u00e8s peuvent devenir vuln\u00e9rables lorsqu\u2019un logiciel malveillant compromet l\u2019appareil qui les g\u00e8re. M\u00eame si Microsoft encourage les utilisateurs \u00e0 adopter 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 associ\u00e9. Les gestionnaires d\u2019identifiants 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 devraient continuer \u00e0 installer les mises \u00e0 jour de s\u00e9curit\u00e9, \u00e9viter les t\u00e9l\u00e9chargements suspects et prot\u00e9ger leurs ordinateurs contre les logiciels malveillants. Google a \u00e9galement introduit la r\u00e9cup\u00e9ration de compte par Selfie Video avec des protections contre les deepfakes, dans le cadre de ses efforts plus larges de s\u00e9curisation des comptes.<\/p>\n\n\n\n
La s\u00e9curit\u00e9 de l\u2019appareil reste particuli\u00e8rement importante lorsqu\u2019on utilise des r\u00e9seaux publics. Microsoft a r\u00e9cemment d\u00e9couvert une campagne mondiale de logiciels malveillants ciblant les voyageurs via des portails captifs compromis dans les h\u00f4tels.<\/p>\n\n\n\n
Via BleepingComputer<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"Les attaques Pass-ta-key peuvent permettre \u00e0 des logiciels malveillants 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 des appareils, la r\u00e9cup\u00e9ration, la synchronisation et les v\u00e9rifications de confiance. L\u2019\u00e9quipe Unit 42 […]<\/p>\n","protected":false},"author":49,"featured_media":25125,"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-25124","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutoriels"],"acf":[],"yoast_head":"\n
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