{"id":114415,"date":"2024-03-19T00:25:59","date_gmt":"2024-03-18T22:25:59","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/kiddy-modul-yadra-linux-dlya-zashhity-ot-skript-kiddi"},"modified":"2024-03-19T00:25:59","modified_gmt":"2024-03-18T22:25:59","slug":"kiddy-modul-yadra-linux-dlya-zashhity-ot-skript-kiddi","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/kiddy-modul-yadra-linux-dlya-zashhity-ot-skript-kiddi","title":{"rendered":"Kiddy \u2014 modu\u0142 j\u0105dra systemu Linux do ochrony przed script kiddie","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex>      <noindex><\/p>\n<p><a rel=\"nofollow\" href=\"https:\/\/github.com\/milabs\/kiddy\">Kiddy<\/a> &ndash; modu\u0142 j\u0105dra Linux, opracowany w celu zminimalizowania ryzyka wykorzystania (niekt\u00f3rych) luk w zabezpieczeniach j\u0105dra.<\/p>\n<p><\/noindex><\/noindex> <\/p>\n<p>Mechanizm ochrony, wdro\u017cony w tym module, opiera si\u0119 na prostej idei, kt\u00f3ra zak\u0142ada, \u017ce w trakcie ataku zidentyfikowanie obiektu ataku jest nieuchronne. Dlatego, je\u015bli utrudnimy t\u0119 identyfikacj\u0119, znacz\u0105co zwi\u0119kszymy trudno\u015b\u0107 eksploatacji, poniewa\u017c w wielu przypadkach gotowe exploity zawieraj\u0105 r\u00f3\u017cnego rodzaju tabele przesuni\u0119\u0107 (offset\u00f3w) odpowiadaj\u0105ce docelowym wersjom j\u0105dra.<\/p>\n<p> <noindex><\/p>\n<p>Na przyk\u0142ad, oto jak to zosta\u0142o zrealizowane dla <a rel=\"nofollow\" href=\"https:\/\/github.com\/xairy\/kernel-exploits\/blob\/master\/CVE-2017-1000112\/poc.c#L91\">CVE-2017-1000112<\/a>. Mo\u017cna tam r\u00f3wnie\u017c zobaczy\u0107, \u017ce identyfikacja wersji j\u0105dra odbywa si\u0119 z wykorzystaniem uname.<\/p>\n<p><\/noindex> <\/p>\n<p>Opracowany modu\u0142 jest prosty do wdro\u017cenia i pozwala na:<\/p>\n<ul>\n<li>zmian\u0119 identyfikacji j\u0105dra;<\/li>\n<li>ograniczenie dost\u0119pu do dziennika j\u0105dra (dmesg);<\/li>\n<li>ograniczenie dost\u0119pu do niekt\u00f3rych plik\u00f3w w \/proc, kt\u00f3re r\u00f3wnie\u017c zawieraj\u0105 identyfikuj\u0105ce informacje;<\/li>\n<li>ograniczenie dost\u0119pu do plik\u00f3w i folder\u00f3w, kt\u00f3re potencjalnie mog\u0105 zawiera\u0107 identyfikuj\u0105ce informacje;<\/li>\n<li>zmian\u0119 identyfikacji wersji j\u0105dra dost\u0119pnej przez vDSO.<\/li>\n<\/ul>\n<p>W trakcie kompilacji modu\u0142 pozwala na u\u017cycie tzw. &laquo;preset\u00f3w&raquo;, kt\u00f3re realizuj\u0105 r\u00f3\u017cn\u0105 logik\u0119 zmiany identyfikacji. Na przyk\u0142ad, korzystaj\u0105c z presetu &laquo;windows&raquo;, mo\u017cna uzyska\u0107 nast\u0119puj\u0105ce zachowanie:<\/p>\n<p><strong>Przed za\u0142adowaniem modu\u0142u<\/strong><\/p>\n<p> $ .\\\/misc\\\/id.sh ** UNAME identidty leaks  &#8212; uname -r    2.6.32-754.35.1.el6.x86_64  &#8212; uname -v    #1 SMP Sat Nov 7 12:42:14 UTC 2020  &#8212; uname -a    Linux localhost.localdomain 2.6.32-754.35.1.el6.x86_64 #1 SMP Sat Nov 7 12:42:14 UTC 2020 x86_64 x86_64 x86_64 GNU\\\/Linux ** PROCFS identidty leaks  &#8212; \\\/proc\\\/cmdline    ro root=\\\/dev\\\/mapper\\\/VolGroup00-LogVol00 rd_NO_LUKS no_timer_check console=tty0 console=ttyS0,115200n8 net.ifnames=0 biosdevname=0 LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16  rd_LVM_LV=VolGroup00\\\/LogVol01 rd_LVM_LV=VolGroup00\\\/LogVol00  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet  &#8212; \\\/proc\\\/version    Linux version 2.6.32-754.35.1.el6.x86_64 (mockbuild@x86-02.bsys.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-23) (GCC) ) #1 SMP Sat Nov 7 12:42:14 UTC 2020  &#8212; \\\/proc\\\/sys\\\/kernel\\\/version    #1 SMP Sat Nov 7 12:42:14 UTC 2020  &#8212; \\\/proc\\\/sys\\\/kernel\\\/osrelease    2.6.32-754.35.1.el6.x86_64 which: no hostnamectl in (\\\/usr\\\/local\\\/bin:\\\/bin:\\\/usr\\\/bin:\\\/usr\\\/local\\\/sbin:\\\/usr\\\/sbin:\\\/sbin:\\\/home\\\/vagrant\\\/bin)   <\/p>\n<p><strong>Po za\u0142adowaniu modu\u0142u<\/strong><\/p>\n<p> $ .\\\/misc\\\/id.sh ** UNAME identidty leaks  &#8212; uname -r    Windows  &#8212; uname -v    NT 4.0  &#8212; uname -a    Linux localhost.localdomain Windows NT 4.0 x86_64 x86_64 x86_64 GNU\\\/Linux ** PROCFS identidty leaks  &#8212; \\\/proc\\\/cmdline    EFIMicrosoftBootbootmgfw.efi  &#8212; \\\/proc\\\/version    Windows NT 4.0  &#8212; \\\/proc\\\/sys\\\/kernel\\\/version    NT 4.0  &#8212; \\\/proc\\\/sys\\\/kernel\\\/osrelease    Windows which: no hostnamectl in (\\\/usr\\\/local\\\/bin:\\\/bin:\\\/usr\\\/bin:\\\/usr\\\/local\\\/sbin:\\\/usr\\\/sbin:\\\/sbin:\\\/home\\\/vagrant\\\/bin)   <\/p>\n<p>Skrypt-kiddy nie przepuszcz\u0105!<\/p>\n<p>\u0179r\u00f3d\u0142o: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.linux.org.ru\/news\/security\/17555973\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>Kiddy &ndash; \u043c\u043e\u0434\u0443\u043b\u044c \u0434\u043b\u044f \u044f\u0434\u0440\u0430 Linux, \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043d\u043d\u044b\u0439 \u0441 \u0446\u0435\u043b\u044c\u044e \u0441\u043d\u0438\u0436\u0435\u043d\u0438\u044f \u0440\u0438\u0441\u043a\u043e\u0432 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 (\u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445) \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u044f\u0434\u0440\u0430. \u0412 \u043e\u0441\u043d\u043e\u0432\u0435 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 \u0437\u0430\u0449\u0438\u0442\u044b, \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u0432 \u0434\u0430\u043d\u043d\u043e\u043c \u043c\u043e\u0434\u0443\u043b\u0435, \u043b\u0435\u0436\u0438\u0442 \u043f\u0440\u043e\u0441\u0442\u0430\u044f \u0438\u0434\u0435\u044f, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0437\u0430\u043a\u043b\u044e\u0447\u0430\u0435\u0442\u0441\u044f \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 \u0430\u0442\u0430\u043a\u0438 \u0442\u0430\u043a \u0438\u043b\u0438 \u0438\u043d\u0430\u0447\u0435 \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044f \u043e\u0431\u044a\u0435\u043a\u0442\u0430 \u0430\u0442\u0430\u043a\u0438. \u041f\u043e\u044d\u0442\u043e\u043c\u0443, \u0435\u0441\u043b\u0438 \u0437\u0430\u0442\u0440\u0443\u0434\u043d\u0438\u0442\u044c \u0442\u0430\u043a\u0443\u044e \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044e, \u043c\u043e\u0436\u043d\u043e \u043a\u0440\u0430\u0442\u043d\u043e \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u043b\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438, \u0442.\u043a. \u0432\u043e \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u0435 \u0441\u043b\u0443\u0447\u0430\u0435\u0432 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-114415","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - 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