{"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\/et\/blog\/administrirovanie\/reshenie-zadaniya-s-pwnable-kr-25-otp-ogranichenie-ramera-fajla-v-linux","title":{"rendered":"K\u00fcsimuse lahendamine pwnable.kr 25 \u2014 otp. Faili suuruse piirang Linuxis","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"K\u00fcsimuse lahendamine pwnable.kr 25 \u2014 otp. Faili suuruse piirang Linuxis\" src=\"\/wp-content\/uploads\/2019\/10\/70434b41e923b3b46bcdff1ab7e03937.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nSelles artiklis lahendame 25. \u00fclesande saidilt <noindex><a rel=\"nofollow\" href=\"https:\/\/pwnable.kr\/index.php\">pwnable.kr<\/a><\/noindex>.<\/p>\n<p><b class=\"spoiler_title\">Organisatsiooniline teave<\/b>Eriti nendele, kes soovivad \u00f5ppida midagi uut ja areneda igas infotehnoloogia ja arvutiteabe valdkonnas, kavatsen kirjutada ja r\u00e4\u00e4kida j\u00e4rgmistest kategooriatest:<\/p>\n<ul>\n<li>PWN;<\/li>\n<li>kr\u00fcptograafia (Crypto);<\/li>\n<li>v\u00f5rgutehnoloogiad (Network);<\/li>\n<li>tagasip\u00f6\u00f6rdumine (Reverse Engineering);<\/li>\n<li>steganograafia (Stegano);<\/li>\n<li>WEB-haavatavuste otsimine ja eksploiteerimine.<\/li>\n<\/ul>\n<p>\nLisaks jagan oma kogemusi arvutikriminaalsuses, pahavara ja p\u00fcsivara anal\u00fc\u00fcsimisel, juhtmevabade v\u00f5rkude ja kohalike arvutiv\u00f5rkude r\u00fcndamisel, pentestide l\u00e4biviimisel ja exploiteerimise kirjutamisel.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nKuna soovite saada teavet uute artiklite, tarkvara ja muu kohta, olen loonud <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/RalfHackerChannel\">kanali Telegramis<\/a><\/noindex> ja <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/RalfHackerPublicChat\">r\u00fchma mis tahes k\u00fcsimuste arutamiseks<\/a><\/noindex> infotehnoloogia ja k\u00fcberturvalisuse valdkonnas. Samuti vaatan teie isiklikud soovid, k\u00fcsimused, ettepanekud ja soovitused <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/hackerralf8\">isiklikult l\u00e4bi ja vastan k\u00f5igile.<\/a><\/noindex>.<\/p>\n<p>Kogu teave on esitatud \u00fcksnes hariduslikel eesm\u00e4rkidel. Selle dokumendi autor ei vastuta mingite kahjustuste eest, mis v\u00f5ivad kellelegi tekkida selle dokumendi uurimise k\u00e4igus saadud teadmiste ja meetodite kasutamisest.<\/p>\n<h2>\u00dclesande otp lahendus<\/h2>\n<p>\nJ\u00e4tkame teise osa juurde. \u00dctleksin kohe, et see on keerulisem kui esimene, kuid seekord ei pakuta meile programmi l\u00e4htekoodi. \u00c4rge unustage arutelu siin (https:\/\/t.me\/RalfHackerPublicChat) ja siin (https:\/\/t.me\/RalfHackerChannel). Alustame.<\/p>\n<p>Kl\u00f5psame ikoonil, mille peal on kirjutatud otp. Meile antakse aadress ja port \u00fchendamiseks.<\/p>\n<p><img decoding=\"async\" alt=\"K\u00fcsimuse lahendamine pwnable.kr 25 \u2014 otp. Faili suuruse piirang Linuxis\" src=\"\/wp-content\/uploads\/2019\/10\/fec98a1c755c36ba1a7117bfc5154611.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00dchendame ja vaatame serveris ringi.<\/p>\n<p><img decoding=\"async\" alt=\"K\u00fcsimuse lahendamine pwnable.kr 25 \u2014 otp. Faili suuruse piirang Linuxis\" src=\"\/wp-content\/uploads\/2019\/10\/71983f5701fe2b1366cebfb0d2d57f74.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nLipp, mida me ei saa lugeda, programm ja selle l\u00e4htekood. Vaadakem l\u00e4htekoodi.<\/p>\n<p><img decoding=\"async\" alt=\"K\u00fcsimuse lahendamine pwnable.kr 25 \u2014 otp. Faili suuruse piirang Linuxis\" src=\"\/wp-content\/uploads\/2019\/10\/63e409cd939f41db29ee5c1edfa107a0.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAnal\u00fc\u00fcsime seda. Programm v\u00f5tab argumendiks parooli.<\/p>\n<p><img decoding=\"async\" alt=\"K\u00fcsimuse lahendamine pwnable.kr 25 \u2014 otp. Faili suuruse piirang Linuxis\" src=\"\/wp-content\/uploads\/2019\/10\/5eb6bccb7ed4b82fdd01e24854c2c953.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSeej\u00e4rel salvestatakse muutuja otp juhuslikud 16 bitti.<\/p>\n<p><img decoding=\"async\" alt=\"K\u00fcsimuse lahendamine pwnable.kr 25 \u2014 otp. Faili suuruse piirang Linuxis\" src=\"\/wp-content\/uploads\/2019\/10\/c1420a16c9721a8c87fb86277674f0f2.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKaasaskantavas tmp kaustas luuakse faili juhusliku nimega (esimese 8 bitti otp) ja sinna salvestatakse juhuslikud 8 bitti (teised 8 bitti otp).<\/p>\n<p><img decoding=\"async\" alt=\"K\u00fcsimuse lahendamine pwnable.kr 25 \u2014 otp. Faili suuruse piirang Linuxis\" src=\"\/wp-content\/uploads\/2019\/10\/d6fcc612f6cddbff338fff0aaf9b73a1.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMillekski loetakse loodud failist v\u00e4\u00e4rtus ja v\u00f5rreldakse sisestatud parooliga.<\/p>\n<p><img decoding=\"async\" alt=\"K\u00fcsimuse lahendamine pwnable.kr 25 \u2014 otp. Faili suuruse piirang Linuxis\" src=\"\/wp-content\/uploads\/2019\/10\/42302a748b7cd57a6337be00eab2c47b.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSiin ongi haavatavus. See seisneb genereeritud arvu vahepealses salvestamises faili. Me saame faili suurust piirata, n\u00e4iteks 0-ni, siis v\u00f5rreldakse parooli kirjutamisel ja lugemisel 0-ega. Seda saab teha nii.<\/p>\n<pre><code class=\"bash\"># ulimit -f 0<\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"K\u00fcsimuse lahendamine pwnable.kr 25 \u2014 otp. Faili suuruse piirang Linuxis\" src=\"\/wp-content\/uploads\/2019\/10\/3af83c20d1de7435b0f40a36c8187ff0.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nN\u00fc\u00fcd k\u00e4ivitame programmi.<\/p>\n<p><img decoding=\"async\" alt=\"K\u00fcsimuse lahendamine pwnable.kr 25 \u2014 otp. Faili suuruse piirang Linuxis\" src=\"\/wp-content\/uploads\/2019\/10\/a289bd59a22aa495fe6407c3c8ff0416.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSaame veateate. Pole hullu, see on k\u00e4sitletav sama Pythoniga.<\/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=\"K\u00fcsimuse lahendamine pwnable.kr 25 \u2014 otp. Faili suuruse piirang Linuxis\" src=\"\/wp-content\/uploads\/2019\/10\/b8513f020879d5e5ee957e1bc137b61a.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSaame lipu ja kerged 100 punkti. J\u00e4tkame: j\u00e4rgmises artiklis k\u00e4sitleme Webi. Liitu meiega <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/RalfHackerChannel\">Telegram<\/a><\/noindex>.<br \/>\n<br \/>Allikas: <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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