{"id":38822,"date":"2019-10-31T22:26:11","date_gmt":"2019-10-31T19:26:11","guid":{"rendered":"https:\/\/prohoster.info\/blog\/reshenie-zadaniya-s-pwnable-kr-25-otp-ogranichenie-ramera-fajla-v-linux\/"},"modified":"2019-10-31T22:26:11","modified_gmt":"2019-10-31T19:26:11","slug":"reshenie-zadaniya-s-pwnable-kr-25-otp-ogranichenie-ramera-fajla-v-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/administrirovanie\/reshenie-zadaniya-s-pwnable-kr-25-otp-ogranichenie-ramera-fajla-v-linux","title":{"rendered":"Soluzione del compito su pwnable.kr 25 \u2014 otp. Limite di dimensione del file in Linux","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Soluzione del compito su pwnable.kr 25 \u2014 otp. Limite di dimensione del file in Linux\" src=\"\/wp-content\/uploads\/2019\/10\/70434b41e923b3b46bcdff1ab7e03937.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nIn questo articolo risolveremo il 25\u00b0 incarico dal sito <noindex><a rel=\"nofollow\" href=\"https:\/\/pwnable.kr\/index.php\">pwnable.kr<\/a><\/noindex>.<\/p>\n<p><b class=\"spoiler_title\">Informazioni organizzative<\/b>Specialmente per chi desidera imparare qualcosa di nuovo e crescere in qualsiasi campo della sicurezza informatica, scriver\u00f2 e parler\u00f2 delle seguenti categorie:<\/p>\n<ul>\n<li>PWN;<\/li>\n<li>criptografia (Crypto);<\/li>\n<li>tecnologie di rete (Network);<\/li>\n<li>reverse engineering (Reverse Engineering);<\/li>\n<li>steganografia (Stegano);<\/li>\n<li>ricerca e sfruttamento delle vulnerabilit\u00e0 WEB.<\/li>\n<\/ul>\n<p>\nInoltre, condivider\u00f2 la mia esperienza in informatica forense, analisi di malware e firmware, attacchi su reti wireless e reti locali, esecuzione di pentest e scrittura di exploit.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nPer rimanere aggiornato su nuovi articoli, software e altre informazioni, ho creato un <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/RalfHackerChannel\">canale su Telegram<\/a><\/noindex> e <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/RalfHackerPublicChat\">un gruppo per discutere qualsiasi domanda<\/a><\/noindex> nel campo della sicurezza informatica. Inoltre, le vostre richieste personali, domande, suggerimenti e raccomandazioni <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/hackerralf8\">saranno esaminate personalmente e risponder\u00f2 a tutti.<\/a><\/noindex>.<\/p>\n<p>Tutte le informazioni sono presentate esclusivamente a scopo educativo. L'autore di questo documento non si assume alcuna responsabilit\u00e0 per eventuali danni causati a chiunque dall'uso delle conoscenze e dei metodi acquisiti attraverso lo studio di questo documento.<\/p>\n<h2>Soluzione del compito otp<\/h2>\n<p>\nContinuiamo con la seconda sezione. Dico subito che \u00e8 pi\u00f9 difficile della prima, ma questa volta forniscono il codice sorgente del programma. Non dimentichiamo di discutere qui (https:\/\/t.me\/RalfHackerPublicChat) e qui (https:\/\/t.me\/RalfHackerChannel). Iniziamo.<\/p>\n<p>Clicchiamo sull'icona con l'etichetta otp. Ci vengono forniti l'indirizzo e la porta per connetterci.<\/p>\n<p><img decoding=\"async\" alt=\"Soluzione del compito su pwnable.kr 25 \u2014 otp. Limite di dimensione del file in Linux\" src=\"\/wp-content\/uploads\/2019\/10\/fec98a1c755c36ba1a7117bfc5154611.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nCi connettiamo e ci guardiamo intorno sul server.<\/p>\n<p><img decoding=\"async\" alt=\"Soluzione del compito su pwnable.kr 25 \u2014 otp. Limite di dimensione del file in Linux\" src=\"\/wp-content\/uploads\/2019\/10\/71983f5701fe2b1366cebfb0d2d57f74.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nLa flag che non possiamo leggere, il programma e il suo codice sorgente. Diamo un'occhiata al sorgente.<\/p>\n<p><img decoding=\"async\" alt=\"Soluzione del compito su pwnable.kr 25 \u2014 otp. Limite di dimensione del file in Linux\" src=\"\/wp-content\/uploads\/2019\/10\/63e409cd939f41db29ee5c1edfa107a0.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAnalizziamolo. Il programma accetta come argomento la password.<\/p>\n<p><img decoding=\"async\" alt=\"Soluzione del compito su pwnable.kr 25 \u2014 otp. Limite di dimensione del file in Linux\" src=\"\/wp-content\/uploads\/2019\/10\/5eb6bccb7ed4b82fdd01e24854c2c953.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSuccessivamente, nella variabile otp viene salvato un byte casuale di 16.<\/p>\n<p><img decoding=\"async\" alt=\"Soluzione del compito su pwnable.kr 25 \u2014 otp. Limite di dimensione del file in Linux\" src=\"\/wp-content\/uploads\/2019\/10\/c1420a16c9721a8c87fb86277674f0f2.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNella cartella tmp viene creato un file con un nome casuale (i primi 8 byte di otp) e al suo interno vengono scritti 8 byte casuali (gli ultimi 8 byte di otp).<\/p>\n<p><img decoding=\"async\" alt=\"Soluzione del compito su pwnable.kr 25 \u2014 otp. Limite di dimensione del file in Linux\" src=\"\/wp-content\/uploads\/2019\/10\/d6fcc612f6cddbff338fff0aaf9b73a1.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPer qualche motivo, dal file creato viene letto il valore e confrontato con la password immessa.<\/p>\n<p><img decoding=\"async\" alt=\"Soluzione del compito su pwnable.kr 25 \u2014 otp. Limite di dimensione del file in Linux\" src=\"\/wp-content\/uploads\/2019\/10\/42302a748b7cd57a6337be00eab2c47b.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nQui si presenta la vulnerabilit\u00e0. Essa consiste nel salvataggio temporaneo del numero generato in un file. Possiamo limitare la dimensione del file, ad esempio a 0, in modo che durante la scrittura e la lettura con la password venga confrontato 0. Possiamo farlo in questo modo.<\/p>\n<pre><code class=\"bash\"># ulimit -f 0<\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"Soluzione del compito su pwnable.kr 25 \u2014 otp. Limite di dimensione del file in Linux\" src=\"\/wp-content\/uploads\/2019\/10\/3af83c20d1de7435b0f40a36c8187ff0.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nOra avviamo il programma.<\/p>\n<p><img decoding=\"async\" alt=\"Soluzione del compito su pwnable.kr 25 \u2014 otp. Limite di dimensione del file in Linux\" src=\"\/wp-content\/uploads\/2019\/10\/a289bd59a22aa495fe6407c3c8ff0416.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nRicevi un errore. Nessun problema, poich\u00e9 pu\u00f2 essere gestito con lo stesso Python.<\/p>\n<pre><code class=\"python\">python -c \"import os, signal; signal.signal(signal.SIGXFSZ, signal.SIG_IGN); os.system('.\/otp 0')\" <\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"Soluzione del compito su pwnable.kr 25 \u2014 otp. Limite di dimensione del file in Linux\" src=\"\/wp-content\/uploads\/2019\/10\/b8513f020879d5e5ee957e1bc137b61a.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nOtteniamo il flag e i nostri facili 100 punti. E continuiamo: nel prossimo articolo parleremo di Web. Puoi unirti a noi in <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/RalfHackerChannel\">Telegram<\/a><\/noindex>.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/471042\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u0434\u0430\u043d\u043d\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u0440\u0435\u0448\u0438\u043c 25-\u0435 \u0437\u0430\u0434\u0430\u043d\u0438\u0435 \u0441 \u0441\u0430\u0439\u0442\u0430 pwnable.kr. \u041e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u043e\u043d\u043d\u0430\u044f \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f\u0421\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0434\u043b\u044f \u0442\u0435\u0445, \u043a\u0442\u043e \u0445\u043e\u0447\u0435\u0442 \u0443\u0437\u043d\u0430\u0432\u0430\u0442\u044c \u0447\u0442\u043e-\u0442\u043e \u043d\u043e\u0432\u043e\u0435 \u0438 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0442\u044c\u0441\u044f \u0432 \u043b\u044e\u0431\u043e\u0439 \u0438\u0437 \u0441\u0444\u0435\u0440 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0438 \u043a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440\u043d\u043e\u0439 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438, \u044f \u0431\u0443\u0434\u0443 \u043f\u0438\u0441\u0430\u0442\u044c \u0438 \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u044b\u0432\u0430\u0442\u044c \u043e \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0445 \u043a\u0430\u0442\u0435\u0433\u043e\u0440\u0438\u044f\u0445: PWN; \u043a\u0440\u0438\u043f\u0442\u043e\u0433\u0440\u0430\u0444\u0438\u044f (Crypto); c\u0435\u0442\u0435\u0432\u044b\u0435 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 (Network); \u0440\u0435\u0432\u0435\u0440\u0441 (Reverse Engineering); \u0441\u0442\u0435\u0433\u0430\u043d\u043e\u0433\u0440\u0430\u0444\u0438\u044f (Stegano); \u043f\u043e\u0438\u0441\u043a \u0438 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u044f WEB-\u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439. \u0412\u0434\u043e\u0431\u0430\u0432\u043e\u043a \u043a \u044d\u0442\u043e\u043c\u0443 \u044f [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":29120,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-38822","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u0434\u0430\u043d\u043d\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u0440\u0435\u0448\u0438\u043c 25-\u0435 \u0437\u0430\u0434\u0430\u043d\u0438\u0435 \u0441 \u0441\u0430\u0439\u0442\u0430 pwnable.kr. \u041e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u043e\u043d\u043d\u0430\u044f \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f\u0421\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0434\u043b\u044f \u0442\u0435\u0445, \u043a\u0442\u043e \u0445\u043e\u0447\u0435\u0442 \u0443\u0437\u043d\u0430\u0432\u0430\u0442\u044c \u0447\u0442\u043e-\u0442\u043e \u043d\u043e\u0432\u043e\u0435 \u0438 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0442\u044c\u0441\u044f \u0432 \u043b\u044e\u0431\u043e\u0439 \u0438\u0437 \u0441\u0444\u0435\u0440 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0438 \u043a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440\u043d\u043e\u0439 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438, \u044f \u0431\u0443\u0434\u0443 \u043f\u0438\u0441\u0430\u0442\u044c \u0438 \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u044b\u0432\u0430\u0442\u044c \u043e \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0445 \u043a\u0430\u0442\u0435\u0433\u043e\u0440\u0438\u044f\u0445: PWN; 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\u043a\u0440\u0438\u043f\u0442\u043e\u0433\u0440\u0430\u0444\u0438\u044f (Crypto); c\u0435\u0442\u0435\u0432\u044b\u0435 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 (Network); \u0440\u0435\u0432\u0435\u0440\u0441 (Reverse Engineering); \u0441\u0442\u0435\u0433\u0430\u043d\u043e\u0433\u0440\u0430\u0444\u0438\u044f (Stegano); \u043f\u043e\u0438\u0441\u043a \u0438 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u044f WEB-\u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439. \u0412\u0434\u043e\u0431\u0430\u0432\u043e\u043a \u043a \u044d\u0442\u043e\u043c\u0443 \u044f\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/it\/blog\/administrirovanie\/reshenie-zadaniya-s-pwnable-kr-25-otp-ogranichenie-ramera-fajla-v-linux\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"350\" \/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2019-10-31T19:26:11+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2019-10-31T19:26:11+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Soluzione del compito di pwnable.kr 25 \u2014 otp. Limite di dimensione del file in Linux | ProHoster","description":"In questo articolo risolveremo il 25\u00b0 compito dal sito pwnable.kr. Informazioni organizzative: specialmente per coloro che vogliono imparare qualcosa di nuovo e svilupparsi in uno qualsiasi dei campi della sicurezza informatica e informatica, scriver\u00f2 e parler\u00f2 delle seguenti categorie: PWN; crittografia (Crypto); tecnologie di rete (Network); reverse (Reverse Engineering); steganografia (Stegano); ricerca e sfruttamento delle vulnerabilit\u00e0 WEB. 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