{"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\/da\/blog\/news\/uyazvimost-v-python-pozvolyayushhaya-vyzvat-sistemnye-komandy-iz-izolirovannyh-skriptov","title":{"rendered":"S\u00e5rbarhed i Python, der muligg\u00f8r udf\u00f8relse af systemkommandoer fra isolerede scripts","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Metoden til at omg\u00e5 systemer for isoleret kodeeksekvering p\u00e5 Python er offentliggjort, baseret p\u00e5 en velkendt fejl, der opstod i Python 2.7, identificeret i 2012 og stadig ikke rettet i Python 3. Fejlen g\u00f8r det muligt at initiere adgang til allerede frigivet hukommelse (Use-After-Free) i CPython ved hj\u00e6lp af specielt sammensat Python-kode. Det blev oprindeligt antaget, at fejlen ikke udg\u00f8r en sikkerhedstrussel og kun i meget sj\u00e6ldne tilf\u00e6lde, normalt kunstigt skabte, kunne f\u00f8re til, at et script afsluttede med en fejl. <\/p>\n

Sikkerhedsforskeren under pseudonymet kn32 har interesseret sig for problemet og lykkedes med at forberede en fungerende exploit, der muligg\u00f8r udf\u00f8relse af enhver systemkommando uden direkte adgang til metoder som os.system. Exploiten er skrevet i ren Python og fungerer uden import af eksterne biblioteker og uden at installere handleren 'code.__new__'. Der bruges kun hook'et 'builtin.__id__', som normalt ikke er forbudt. Praktisk set kan den foresl\u00e5ede kode anvendes til at omg\u00e5 isolationsmekanismer i forskellige tjenester og milj\u00f8er (f.eks. i tr\u00e6ningsmilj\u00f8er, online-skal, indbyggede h\u00e5ndteringssystemer osv.), der tillader udf\u00f8relse af kode i Python, men som begr\u00e6nser tilg\u00e6ngelige kald og ikke tillader adgang til metoder som os.system. <\/p>\n

Den foresl\u00e5ede kode er en analog til kaldet os.system, der fungerer ved at udnytte en s\u00e5rbarhed i CPython. Exploiten fungerer med alle versioner af Python 3 p\u00e5 systemer med x86-64 arkitektur og viser stabil ydeevne i Ubuntu 22.04, selv n\u00e5r beskyttelsesmodi som PIE, RELRO og CET er aktiveret. Arbejdet best\u00e5r i at hente oplysninger fra koden skrevet i Python om adressen p\u00e5 en af funktionerne i den udf\u00f8rte CPython-kode. P\u00e5 baggrund af denne adresse beregnes den grundl\u00e6ggende adresse for CPython i hukommelsen og adressen p\u00e5 funktionen system() i den indl\u00e6ste libc-instans. Til sidst initieres et direkte spring til den specifikke adresse for system med inds\u00e6ttelse af pegepinden til den f\u00f8rste argument p\u00e5 strengen '\/bin\/sh'.

\"S\u00e5rbarhed<\/center>
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u043c\u0435\u0442\u043e\u0434 \u043e\u0431\u0445\u043e\u0434\u0430 \u0441\u0438\u0441\u0442\u0435\u043c \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Python, \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u043d\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0434\u0430\u0432\u043d\u043e \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e\u0439 \u043e\u0448\u0438\u0431\u043a\u0438, \u043f\u043e\u044f\u0432\u0438\u0432\u0448\u0435\u0439\u0441\u044f \u0432 Python 2.7, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u043e\u0439 \u0432 2012 \u0433\u043e\u0434\u0443 \u0438 \u0434\u043e \u0441\u0438\u0445 \u043f\u043e\u0440 \u043d\u0435 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0439 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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\udd47S\u00e5rbarhed i Python, der muligg\u00f8r udf\u00f8relse af systemkommandoer fra isolerede scripts | ProHoster","description":"Metoden til at omg\u00e5 systemer for isoleret kodeeksekvering p\u00e5 Python er offentliggjort, baseret p\u00e5 en velkendt fejl, der opstod i Python 2.7, identificeret i 2012 og stadig ikke 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