{"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\/nl\/blog\/news\/uyazvimost-v-python-pozvolyayushhaya-vyzvat-sistemnye-komandy-iz-izolirovannyh-skriptov","title":{"rendered":"Kwetsbaarheid in Python waardoor systeemcommando's vanuit ge\u00efsoleerde scripts kunnen worden aangeroepen","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Er is een methode gepubliceerd voor het omzeilen van systemen voor ge\u00efsoleerde uitvoering van code in Python, gebaseerd op een al lang bekende kwetsbaarheid die is ontdekt in Python 2.7, in 2012, en tot op heden niet is verholpen in Python 3. Deze kwetsbaarheid stelt gebruikers in staat om met speciaal samengestelde Python-code toegang te krijgen tot al geruimde geheugen (Use-After-Free) in CPython. Aanvankelijk werd aangenomen dat deze kwetsbaarheid geen veiligheidsrisico vormde en alleen in zeer zeldzame gevallen, doorgaans kunstmatig gecre\u00eberd, kon leiden tot het onverwacht be\u00ebindigen van een script. <\/p>\n

De beveiligingsonderzoeker met het pseudoniem kn32 heeft zich verdiept in het probleem en is erin geslaagd een werkende exploit voor te bereiden die het mogelijk maakt om elke systeemopdracht uit te voeren zonder directe toegang tot methoden zoals os.system. De exploit is geschreven in pure Python en werkt zonder externe bibliotheken te importeren of de handler 'code.__new__' te installeren. Van de hooks wordt alleen 'builtin.__id__' gebruikt, dat doorgaans niet verboden is. Praktisch gezien kan de voorgestelde code worden toegepast om isolatiemechanismen in verschillende services en omgevingen te omzeilen (bijvoorbeeld in leeromgevingen, online shells, ingebouwde handlers, enz.) die de uitvoering van Python-code toestaan, maar beperkte aanroepen hebben en geen toegang toestaan tot methoden zoals os.system. <\/p>\n

De voorgestelde code is een analoge oproep aan os.system, die via de exploitatie van een kwetsbaarheid in CPython werkt. De exploit werkt met alle versies van Python 3 op systemen met een x86-64 architectuur en toont stabiele werking in Ubuntu 22.04, zelfs met ingeschakelde beschermingsmodi zoals PIE, RELRO en CET. Het proces houdt in dat uit de Python-code informatie over het adres van een van de functies in de uitvoerbare code van CPython wordt verkregen. Op basis van dit adres wordt het basisadres van CPython in het geheugen en het adres van de functie system() in de geladen libc-instantie berekend. Ten slotte wordt een directe sprong naar een bepaald adres van system ge\u00efnitieerd door de pointer van het eerste argument in te stellen op de string '\/bin\/sh'.

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

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[…]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":104044,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-104043","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Kwetsbaarheid in Python waardoor systeemcommando's vanuit ge\u00efsoleerde scripts kunnen worden aangeroepen | ProHoster","description":"Er is een methode gepubliceerd voor het omzeilen van systemen voor ge\u00efsoleerde uitvoering van code in Python, gebaseerd op een al lang bekende kwetsbaarheid die is ontdekt in Python 2.7, in 2012, en tot op heden niet is verholpen 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