{"id":104043,"date":"2022-05-15T09:36:47","date_gmt":"2022-05-15T07:36:48","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-python-pozvolyayushhaya-vyzvat-sistemnye-komandy-iz-izolirovannyh-skriptov"},"modified":"2022-05-15T09:36:47","modified_gmt":"2022-05-15T07:36:48","slug":"uyazvimost-v-python-pozvolyayushhaya-vyzvat-sistemnye-komandy-iz-izolirovannyh-skriptov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/uyazvimost-v-python-pozvolyayushhaya-vyzvat-sistemnye-komandy-iz-izolirovannyh-skriptov","title":{"rendered":"Une vuln\u00e9rabilit\u00e9 dans Python permettant d'invoquer des commandes syst\u00e8me \u00e0 partir de scripts isol\u00e9s.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

M\u00e9thode de contournement des syst\u00e8mes d'ex\u00e9cution isol\u00e9e en Python publi\u00e9e, bas\u00e9e sur une vuln\u00e9rabilit\u00e9 bien connue survenue dans Python 2.7, d\u00e9tect\u00e9e en 2012 et toujours non corrig\u00e9e dans Python 3. Cette vuln\u00e9rabilit\u00e9 permet, gr\u00e2ce \u00e0 un code Python sp\u00e9cialement con\u00e7u, d'acc\u00e9der \u00e0 de la m\u00e9moire d\u00e9j\u00e0 lib\u00e9r\u00e9e (Use-After-Free) dans CPython. On pensait \u00e0 l'origine que cette vuln\u00e9rabilit\u00e9 ne posait pas de risque de s\u00e9curit\u00e9 et ne pouvait provoquer un crash de script que dans de tr\u00e8s rares cas, g\u00e9n\u00e9ralement artificiellement cr\u00e9\u00e9s. <\/p>\n

Un chercheur en s\u00e9curit\u00e9 sous le pseudonyme de kn32 s'est int\u00e9ress\u00e9 \u00e0 la probl\u00e9matique et a r\u00e9ussi \u00e0 pr\u00e9parer un exploit fonctionnel permettant d'ex\u00e9cuter n'importe quelle commande syst\u00e8me sans avoir un acc\u00e8s direct aux m\u00e9thodes comme os.system. L'exploit est r\u00e9alis\u00e9 en pur Python et fonctionne sans importer de biblioth\u00e8ques externes ni installer le gestionnaire 'code.__new__'. Seul 'builtin.__id__' est utilis\u00e9 parmi les hooks, ce qui est g\u00e9n\u00e9ralement autoris\u00e9. D'un point de vue pratique, le code propos\u00e9 peut \u00eatre utilis\u00e9 pour contourner des m\u00e9canismes d'isolation dans divers services et environnements (par exemple, dans des environnements d'apprentissage, des shells en ligne, des gestionnaires int\u00e9gr\u00e9s, etc.) qui autorisent l'ex\u00e9cution de code en Python, mais limitent les appels disponibles et interdisent l'acc\u00e8s \u00e0 des m\u00e9thodes telles que os.system. <\/p>\n

Le code propos\u00e9 est l'\u00e9quivalent d'un appel \u00e0 os.system, fonctionnant par l'exploitation d'une vuln\u00e9rabilit\u00e9 dans CPython. L'exploit fonctionne avec toutes les versions de Python 3 sur les syst\u00e8mes architectur\u00e9s en x86-64 et d\u00e9montre une stabilit\u00e9 sur Ubuntu 22.04, m\u00eame avec les modes de protection PIE, RELRO et CET activ\u00e9s. Le fonctionnement consiste \u00e0 obtenir via du code Python l'adresse d'une des fonctions dans le code ex\u00e9cutable de CPython. \u00c0 partir de cette adresse, l'adresse de base de CPython en m\u00e9moire et l'adresse de la fonction system() dans l'instance de libc charg\u00e9e en m\u00e9moire sont calcul\u00e9es. Enfin, un saut direct est effectu\u00e9 vers l'adresse d\u00e9termin\u00e9e de system en rempla\u00e7ant le pointeur du premier argument par la cha\u00eene '\/bin\/sh'.

\"Une<\/center>
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Source : opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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