{"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\/cs\/blog\/administrirovanie\/reshenie-zadaniya-s-pwnable-kr-25-otp-ogranichenie-ramera-fajla-v-linux","title":{"rendered":"\u0158e\u0161en\u00ed \u00fakolu z pwnable.kr 25 \u2014 otp. Omezen\u00ed velikosti souboru v Linuxu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"\u0158e\u0161en\u00ed \u00fakolu z pwnable.kr 25 \u2014 otp. Omezen\u00ed velikosti souboru v Linuxu\" src=\"\/wp-content\/uploads\/2019\/10\/70434b41e923b3b46bcdff1ab7e03937.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nV tomto \u010dl\u00e1nku vy\u0159e\u0161\u00edme 25. \u00fakol z webu <noindex><a rel=\"nofollow\" href=\"https:\/\/pwnable.kr\/index.php\">pwnable.kr<\/a><\/noindex>.<\/p>\n<p><b class=\"spoiler_title\">Organiza\u010dn\u00ed informace<\/b>Speci\u00e1ln\u011b pro ty, kte\u0159\u00ed se cht\u011bj\u00ed dozv\u011bd\u011bt n\u011bco nov\u00e9ho a rozv\u00edjet se v jak\u00e9koli oblasti informa\u010dn\u00ed a po\u010d\u00edta\u010dov\u00e9 bezpe\u010dnosti, budu ps\u00e1t a vypr\u00e1v\u011bt o n\u00e1sleduj\u00edc\u00edch kategori\u00edch:<\/p>\n<ul>\n<li>PWN;<\/li>\n<li>kryptografie (Crypto);<\/li>\n<li>s\u00ed\u0165ov\u00e9 technologie (Network);<\/li>\n<li>reverzn\u00ed in\u017een\u00fdrstv\u00ed (Reverse Engineering);<\/li>\n<li>steganografie (Stegano);<\/li>\n<li>vyhled\u00e1v\u00e1n\u00ed a exploatace WEB zranitelnost\u00ed.<\/li>\n<\/ul>\n<p>\nKrom\u011b toho se pod\u011bl\u00edm o sv\u00e9 zku\u0161enosti v po\u010d\u00edta\u010dov\u00e9 kriminalistice, anal\u00fdze malwaru a firmwaru, \u00fatoc\u00edch na bezdr\u00e1tov\u00e9 s\u00edt\u011b a m\u00edstn\u00ed v\u00fdpo\u010detn\u00ed s\u00edt\u011b, prov\u00e1d\u011bn\u00ed penetra\u010dn\u00edch test\u016f a psan\u00ed exploit\u016f.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nAbychom v\u00e1s mohli informovat o nov\u00fdch \u010dl\u00e1nc\u00edch, softwaru a dal\u0161\u00edch informac\u00edch, vytvo\u0159il jsem <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/RalfHackerChannel\">kan\u00e1l na Telegramu<\/a><\/noindex> a <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/RalfHackerPublicChat\">skupinu pro diskuzi jak\u00fdchkoli ot\u00e1zek<\/a><\/noindex> v oblasti IKT. Tak\u00e9 va\u0161e osobn\u00ed \u017e\u00e1dosti, ot\u00e1zky, n\u00e1vrhy a doporu\u010den\u00ed <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/hackerralf8\">projedn\u00e1m osobn\u011b a odpov\u00edm v\u0161em<\/a><\/noindex>.<\/p>\n<p>Ve\u0161ker\u00e9 informace jsou poskytov\u00e1ny v\u00fdhradn\u011b pro vzd\u011bl\u00e1vac\u00ed \u00fa\u010dely. Autor tohoto dokumentu nenese \u017e\u00e1dnou odpov\u011bdnost za jakoukoli \u0161kodu zp\u016fsobenou komukoli v d\u016fsledku pou\u017eit\u00ed znalost\u00ed a metod z\u00edskan\u00fdch studi\u00ed tohoto dokumentu.<\/p>\n<h2>\u0158e\u0161en\u00ed \u00fakolu otp<\/h2>\n<p>\nPokra\u010dujeme do druh\u00e9 \u010d\u00e1sti. Hned \u0159eknu, \u017ee je to slo\u017eit\u011bj\u0161\u00ed ne\u017e prvn\u00ed, ale tentokr\u00e1t n\u00e1m neposkytuj\u00ed zdrojov\u00fd k\u00f3d programu. Nezapome\u0148te na diskuzi zde(https:\/\/t.me\/RalfHackerPublicChat) a zde (https:\/\/t.me\/RalfHackerChannel). Za\u010dn\u011bme.<\/p>\n<p>Klikneme na ikonu s n\u00e1pisem otp. D\u00e1vaj\u00ed n\u00e1m adresu a port pro p\u0159ipojen\u00ed.<\/p>\n<p><img decoding=\"async\" alt=\"\u0158e\u0161en\u00ed \u00fakolu z pwnable.kr 25 \u2014 otp. Omezen\u00ed velikosti souboru v Linuxu\" src=\"\/wp-content\/uploads\/2019\/10\/fec98a1c755c36ba1a7117bfc5154611.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nP\u0159ipoj\u00edme se a prozkoum\u00e1me server.<\/p>\n<p><img decoding=\"async\" alt=\"\u0158e\u0161en\u00ed \u00fakolu z pwnable.kr 25 \u2014 otp. Omezen\u00ed velikosti souboru v Linuxu\" src=\"\/wp-content\/uploads\/2019\/10\/71983f5701fe2b1366cebfb0d2d57f74.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nFlag, kter\u00fd nem\u016f\u017eeme p\u0159e\u010d\u00edst, program a jeho zdrojov\u00fd k\u00f3d. Poj\u010fme se pod\u00edvat na zdroj.<\/p>\n<p><img decoding=\"async\" alt=\"\u0158e\u0161en\u00ed \u00fakolu z pwnable.kr 25 \u2014 otp. Omezen\u00ed velikosti souboru v Linuxu\" src=\"\/wp-content\/uploads\/2019\/10\/63e409cd939f41db29ee5c1edfa107a0.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nRozeb\u00edr\u00e1me jej. Program p\u0159ij\u00edm\u00e1 jako argument heslo.<\/p>\n<p><img decoding=\"async\" alt=\"\u0158e\u0161en\u00ed \u00fakolu z pwnable.kr 25 \u2014 otp. Omezen\u00ed velikosti souboru v Linuxu\" src=\"\/wp-content\/uploads\/2019\/10\/5eb6bccb7ed4b82fdd01e24854c2c953.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nD\u00e1le se do prom\u011bnn\u00e9 otp ukl\u00e1d\u00e1 n\u00e1hodn\u00fdch 16 byt\u016f.<\/p>\n<p><img decoding=\"async\" alt=\"\u0158e\u0161en\u00ed \u00fakolu z pwnable.kr 25 \u2014 otp. Omezen\u00ed velikosti souboru v Linuxu\" src=\"\/wp-content\/uploads\/2019\/10\/c1420a16c9721a8c87fb86277674f0f2.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nV adres\u00e1\u0159i tmp se vytv\u00e1\u0159\u00ed soubor se n\u00e1hodn\u00fdm n\u00e1zvem (prvn\u00edch 8 byt\u016f otp) a do n\u011bj se zapisuje n\u00e1hodn\u00fdch 8 byt\u016f (druh\u00fdch 8 byt\u016f otp).<\/p>\n<p><img decoding=\"async\" alt=\"\u0158e\u0161en\u00ed \u00fakolu z pwnable.kr 25 \u2014 otp. Omezen\u00ed velikosti souboru v Linuxu\" src=\"\/wp-content\/uploads\/2019\/10\/d6fcc612f6cddbff338fff0aaf9b73a1.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nZ n\u011bjak\u00e9ho d\u016fvodu se ze vytvo\u0159en\u00e9ho souboru \u010dte hodnota a porovn\u00e1v\u00e1 se se zadan\u00fdm heslem.<\/p>\n<p><img decoding=\"async\" alt=\"\u0158e\u0161en\u00ed \u00fakolu z pwnable.kr 25 \u2014 otp. Omezen\u00ed velikosti souboru v Linuxu\" src=\"\/wp-content\/uploads\/2019\/10\/42302a748b7cd57a6337be00eab2c47b.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nZde se nach\u00e1z\u00ed zranitelnost. T\u00fdk\u00e1 se meziukl\u00e1d\u00e1n\u00ed generovan\u00e9ho \u010d\u00edsla do souboru. M\u016f\u017eeme omezit velikost souboru, nap\u0159\u00edklad na 0, a tak bude p\u0159i z\u00e1pisu a \u010dten\u00ed s heslem porovn\u00e1v\u00e1no 0. M\u016f\u017eeme to ud\u011blat takto.<\/p>\n<pre><code class=\"bash\"># ulimit -f 0<\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"\u0158e\u0161en\u00ed \u00fakolu z pwnable.kr 25 \u2014 otp. Omezen\u00ed velikosti souboru v Linuxu\" src=\"\/wp-content\/uploads\/2019\/10\/3af83c20d1de7435b0f40a36c8187ff0.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNyn\u00ed spust\u00edme program.<\/p>\n<p><img decoding=\"async\" alt=\"\u0158e\u0161en\u00ed \u00fakolu z pwnable.kr 25 \u2014 otp. Omezen\u00ed velikosti souboru v Linuxu\" src=\"\/wp-content\/uploads\/2019\/10\/a289bd59a22aa495fe6407c3c8ff0416.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDost\u00e1v\u00e1me chybu. Nic se ned\u011bje, m\u016f\u017ee b\u00fdt zpracov\u00e1na pomoc\u00ed stejn\u00fd 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=\"\u0158e\u0161en\u00ed \u00fakolu z pwnable.kr 25 \u2014 otp. Omezen\u00ed velikosti souboru v Linuxu\" src=\"\/wp-content\/uploads\/2019\/10\/b8513f020879d5e5ee957e1bc137b61a.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nZ\u00edsk\u00e1v\u00e1me vlajku a snadn\u00fdch 100 bod\u016f. Pokra\u010dujeme: v p\u0159\u00ed\u0161t\u00edm \u010dl\u00e1nku se zam\u011b\u0159\u00edme na Web. M\u016f\u017eete se k n\u00e1m p\u0159ipojit na <noindex><a rel=\"nofollow\" href=\"https:\/\/t.me\/RalfHackerChannel\">Telegram<\/a><\/noindex>.<br \/>\n<br \/>Zdroj: <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 5.0.3 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/cs\/blog\/administrirovanie\/reshenie-zadaniya-s-pwnable-kr-25-otp-ogranichenie-ramera-fajla-v-linux\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.3\" \/>\n\t\t<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47\u0420\u0435\u0448\u0435\u043d\u0438\u0435 \u0437\u0430\u0434\u0430\u043d\u0438\u044f \u0441 pwnable.kr 25 \u2014 otp. \u041e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u0435 \u0440\u0430\u043c\u0435\u0440\u0430 \u0444\u0430\u0439\u043b\u0430 \u0432 Linux | ProHoster\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/cs\/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\udd47\u0158e\u0161en\u00ed \u00fakolu z pwnable.kr 25 \u2014 otp. 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