{"id":91251,"date":"2020-08-10T13:42:19","date_gmt":"2020-08-10T11:42:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-ghostscript-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-postscript-dokumenta"},"modified":"2020-08-10T13:42:19","modified_gmt":"2020-08-10T11:42:19","slug":"uyazvimost-v-ghostscript-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-postscript-dokumenta","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/uyazvimost-v-ghostscript-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-postscript-dokumenta","title":{"rendered":"Une vuln\u00e9rabilit\u00e9 dans Ghostscript permet d'ex\u00e9cuter du code lors de l'ouverture d'un document PostScript.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dans Ghostscript, une suite d'outils pour le traitement, la conversion et la g\u00e9n\u00e9ration de documents aux formats PostScript et PDF, une vuln\u00e9rabilit\u00e9 a \u00e9t\u00e9 identifi\u00e9e<\/a><\/noindex> une vuln\u00e9rabilit\u00e9 (CVE-2020-15900<\/a><\/noindex>), qui peut entra\u00eener la modification des fichiers et l'ex\u00e9cution de commandes arbitraires lors de l'ouverture de documents PostScript sp\u00e9cialement con\u00e7us. L'utilisation d'un op\u00e9rateur PostScript non standard dans le document rsearch<\/a><\/noindex> permet de provoquer un d\u00e9passement de type uint32_t lors du calcul de la taille, de r\u00e9\u00e9crire des zones de m\u00e9moire en dehors du tampon allou\u00e9 et d'acc\u00e9der \u00e0 des fichiers dans le syst\u00e8me de fichiers, ce qui peut \u00eatre utilis\u00e9 pour mener une attaque pour ex\u00e9cuter du code arbitraire dans le syst\u00e8me (par exemple, en ajoutant des commandes dans ~\\\/ .bashrc ou ~\\\/ .profile).<\/p>\n

Le probl\u00e8me concerne les versions<\/a><\/noindex> de 9.50 \u00e0 9.52 (le bug est pr\u00e9sent<\/a><\/noindex> depuis la version 9.28rc1, mais selon les donn\u00e9es<\/a><\/noindex> les chercheurs ayant identifi\u00e9 la vuln\u00e9rabilit\u00e9, elle se manifeste avec la version 9.50).<\/p>\n

Le correctif a \u00e9t\u00e9 propos\u00e9 dans la version 9.52.1<\/a><\/noindex> (un patch<\/a><\/noindex>). Des mises \u00e0 jour de paquets avec correction ont d\u00e9j\u00e0 \u00e9t\u00e9 publi\u00e9es pour Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, SUSE<\/a><\/noindex>. Les paquets dans RHEL<\/a><\/noindex> ne sont pas affect\u00e9s par le probl\u00e8me.<\/p>\n

Rappelons que les vuln\u00e9rabilit\u00e9s dans Ghostscript repr\u00e9sentent un danger accru, car ce paquet est utilis\u00e9 dans de nombreuses applications populaires pour le traitement des formats PostScript et PDF. Par exemple, Ghostscript est appel\u00e9 lors de la cr\u00e9ation de miniatures sur le bureau, lors de l'indexation des donn\u00e9es en arri\u00e8re-plan et lors de la conversion d'images. Pour qu'une attaque r\u00e9ussisse, dans de nombreux cas, il suffit de t\u00e9l\u00e9charger un fichier contenant un exploit ou de visualiser le r\u00e9pertoire contenant celui-ci dans Nautilus. Les vuln\u00e9rabilit\u00e9s dans Ghostscript peuvent \u00e9galement \u00eatre exploit\u00e9es via des gestionnaires d'images bas\u00e9s sur les paquets ImageMagick et GraphicsMagick, en leur transmettant un fichier JPEG ou PNG, dans lequel le code PostScript remplace l'image (ce fichier sera trait\u00e9 dans Ghostscript, car le type MIME est reconnu par le contenu, et non en se fiant \u00e0 l'extension).<\/p>\n

<\/a><\/noindex><\/p>\n

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

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