{"id":100806,"date":"2021-07-21T10:22:45","date_gmt":"2021-07-21T08:22:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/root-uyazvimost-v-yadre-linux-i-otkaz-v-obsluzhivanii-v-systemd"},"modified":"2021-07-21T10:22:45","modified_gmt":"2021-07-21T08:22:45","slug":"root-uyazvimost-v-yadre-linux-i-otkaz-v-obsluzhivanii-v-systemd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/news\/root-uyazvimost-v-yadre-linux-i-otkaz-v-obsluzhivanii-v-systemd","title":{"rendered":"Vulnerabiliteti Root n\u00eb b\u00ebrtham\u00ebn Linux dhe ndalimi i sh\u00ebrbimit n\u00eb systemd","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Studiuesit e siguris\u00eb nga kompania Qualys kan\u00eb zbuluar detaje p\u00ebr dy cenueshm\u00ebri q\u00eb prekin kernelin Linux dhe menaxherin e sistemit systemd. Cenueshm\u00ebria n\u00eb kernel (CVE-2021-33909) i lejon nj\u00eb p\u00ebrdoruesi lokal t\u00eb arrij\u00eb ekzekutimin e kodit me privilegje root p\u00ebrmes manipulimeve me direktor\u00eb me nivel t\u00eb madh thell\u00ebsie.     <\/p>\n<p>Rreziku i cenueshm\u00ebris\u00eb r\u00ebndohet edhe m\u00eb shum\u00eb nga fakti se studiuesit arrit\u00ebn t\u00eb p\u00ebrgatisin exploite funksionale q\u00eb punojn\u00eb n\u00eb Ubuntu 20.04\/20.10\/21.04, Debian 11 dhe Fedora 34 me konfigurimin e parazgjedhur. Theksohet se shp\u00ebrndarjet e tjera nuk jan\u00eb testuar, por teorikisht gjithashtu preken nga problemi dhe mund t\u00eb sulmohen. Kodi i plot\u00eb i exploiteve premtohet t\u00eb publikohet pasi problemi t\u00eb jet\u00eb zgjidhur gjer\u00ebsisht, nd\u00ebrsa p\u00ebr momentin \u00ebsht\u00eb i disponuesh\u00ebm vet\u00ebm nj\u00eb prototip me funksionalitet t\u00eb kufizuar, i cili shkakton rr\u00ebzimin e sistemit. Problemi shfaqet q\u00eb nga korriku i vitit 2014 dhe prek versionet e kernelit duke filluar nga 3.16. Korrigjimi i cenueshm\u00ebris\u00eb u koordinua me komunitetin dhe u pranua n\u00eb p\u00ebrb\u00ebrjen e kernelit m\u00eb 19 korrik. Shp\u00ebrndarjet kryesore tashm\u00eb kan\u00eb p\u00ebrgatitur p\u00ebrdit\u00ebsime t\u00eb paketave me kernelin (Debian, Ubuntu, Fedora, RHEL, SUSE, Arch).    <\/p>\n<p>Vulnerabiliteti shkaktohet nga mungesa e verifikimit t\u00eb rezultatit t\u00eb konvertimit nga type size_t n\u00eb int p\u00ebrpara se t\u00eb kryhen operacione n\u00eb kodin seq_file, i cili realizon krijimin e skedave nga nj\u00eb sekuenc\u00eb regjistrash. Mungesa e verifikimit mund t\u00eb \u00e7oj\u00eb n\u00eb nj\u00eb shkruarje n\u00eb zon\u00ebn jasht\u00eb kufijve t\u00eb tamponit gjat\u00eb krijimit, montimit dhe fshirjes s\u00eb strukturave t\u00eb katalog\u00ebve me nj\u00eb nivel shum\u00eb t\u00eb lart\u00eb thell\u00ebsie (madh\u00ebsia e rrug\u00ebs m\u00eb shum\u00eb se 1 GB). Si rezultat, nj\u00eb sulmues mund t\u00eb arrij\u00eb t\u00eb shkruaj\u00eb nj\u00eb varg 10-byte \"\/\/deleted\" me offset \"- 2 GB \u2014 10 bytes\", i cili tregon nj\u00eb zon\u00eb q\u00eb paraprin drejtp\u00ebrdrejt tamponin e alokuar.    <\/p>\n<p>Exploit-i i p\u00ebrgatitur k\u00ebrkon 5 GB memorie dhe 1 milion inode t\u00eb lira p\u00ebr t\u00eb funksionuar. Funksionimi i exploit-it konsiston n\u00eb krijimin, p\u00ebrmes thirrjes mkdir(), t\u00eb nj\u00eb hierarkie me rreth nj\u00eb milion direktor\u00eb t\u00eb futur nj\u00ebri brenda tjetrit p\u00ebr t\u00eb arritur nj\u00eb madh\u00ebsi t\u00eb rrug\u00ebs s\u00eb skedarit q\u00eb tejkalon 1 GB. Ky direktor montohet p\u00ebrmes bind-mount n\u00eb nj\u00eb hap\u00ebsir\u00eb t\u00eb ve\u00e7ant\u00eb emrash t\u00eb identifikuesve t\u00eb p\u00ebrdoruesve (user namespace), pas s\u00eb cil\u00ebs niset funksioni rmdir() p\u00ebr fshirjen e tij. Paralelisht krijohet nj\u00eb thread q\u00eb ngarkon nj\u00eb program t\u00eb vog\u00ebl eBPF, i cili bllokohet n\u00eb faz\u00ebn pas verifikimit t\u00eb pseudokodit eBPF, por p\u00ebrpara JIT-kompilimit t\u00eb tij.     <\/p>\n<p>N\u00eb hap\u00ebsir\u00ebn e emrave t\u00eb identifikuesve t\u00eb p\u00ebrdoruesve pa privilegje, hapet skeda \/proc\/self\/mountinfo dhe fillon t\u00eb lexoj\u00eb nj\u00eb rrug\u00eb t\u00eb gjat\u00eb t\u00eb katalogut t\u00eb montuar me ndihm\u00eb t\u00eb bind-mount, e cila \u00e7on n\u00eb shkruarjen e vargut \"\/\/deleted\" n\u00eb nj\u00eb zon\u00eb para fillimit t\u00eb tamponit. Pozita p\u00ebr shkruarjen e vargut zgjidhet n\u00eb nj\u00eb m\u00ebnyr\u00eb q\u00eb mbi-shkruan nj\u00eb instrukcion n\u00eb nj\u00eb program q\u00eb \u00ebsht\u00eb kontrolluar tashm\u00eb, por ende nuk \u00ebsht\u00eb kompiliuar, eBPF.   <\/p>\n<p>M\u00eb pas, n\u00eb nivelin e programit eBPF, shkruarja e pakontrolluar jasht\u00eb tamponit transformohet n\u00eb nj\u00eb mund\u00ebsi t\u00eb kontrolluar p\u00ebr t\u00eb lexuar dhe shkruar n\u00eb struktura t\u00eb tjera t\u00eb kernelit p\u00ebrmes manipulimit me strukturat btf dhe map_push_elem. Si rezultat, exploit p\u00ebrcakton vendndodhjen e tamponit modprobe_path[] n\u00eb memorien e kernelit dhe mbi-shkruan aty rrug\u00ebn \"\\\/sbin\\\/modprobe\", e cila lejon iniciimin e ekzekutimit t\u00eb \u00e7do skedari ekzekutiv me t\u00eb drejta root n\u00eb rastin e ekzekutimit t\u00eb thirrjes request_module(), e cila ekzekutohet, p\u00ebr shembull, gjat\u00eb krijimit t\u00eb nj\u00eb soketi netlink.    <\/p>\n<p>K\u00ebrkuesit paraqesin disa metoda p\u00ebr ndihm\u00eb p\u00ebr mbrojtje, t\u00eb cilat jan\u00eb efektive vet\u00ebm p\u00ebr nj\u00eb exploit t\u00eb caktuar, por nuk e eliminon problemin vet\u00eb. Rekomandohet q\u00eb t\u00eb vendoset parametrin \"\/proc\/sys\/kernel\/unprivileged_userns_clone\" n\u00eb vler\u00ebn 0 p\u00ebr t\u00eb ndaluar montimin e katalog\u00ebve n\u00eb nj\u00eb hap\u00ebsir\u00eb identifikuesish t\u00eb p\u00ebrdoruesve, si dhe \"\/proc\/sys\/kernel\/unprivileged_bpf_disabled\" n\u00eb 1 p\u00ebr t\u00eb ndaluar ngarkimin e programeve eBPF n\u00eb kernel.  <center>  <iframe loading=\"lazy\" title=\"Sequoia: Nj\u00eb cenueshm\u00ebri lokale e p\u00ebrshkall\u00ebzimit t\u00eb privilegjeve n\u00eb shtres\u00ebn e sistemit t\u00eb skedar\u00ebve t\u00eb Linux (CVE-2021-33909)\" src=\"https:\/\/player.vimeo.com\/video\/577035507\" width=\"640\" height=\"360\" frameborder=\"0\" allowfullscreen><\/iframe><\/center>      <\/p>\n<p>\u00cbsht\u00eb interesante q\u00eb, duke shqyrtuar nj\u00eb variant alternativ t\u00eb sulmit, i lidhur me p\u00ebrdorimin e mekanizmit FUSE n\u00eb vend t\u00eb bind-mount p\u00ebr montimin e nj\u00eb katalogu t\u00eb madh, studiuesit has\u00ebn nj\u00eb tjet\u00ebr dob\u00ebsi (CVE-2021-33910), e cila prek menaxherin e sistemit systemd. Doli se teksa p\u00ebrpiqeshin t\u00eb montonin p\u00ebrmes FUSE nj\u00eb katalog me nj\u00eb madh\u00ebsi rrug\u00eb q\u00eb tejkalon 8 MB, n\u00eb procesin e kontrollit t\u00eb inicializimit (PID1), ndodhi shterimi i kujtes\u00ebs s\u00eb stack-ut dhe \u00e7rregullimi q\u00eb \u00e7on sistemin n\u00eb gjendjen \"panic.\"     <\/p>\n<p>Problemi lidhet me faktin q\u00eb systemd gjurmon dhe analizon p\u00ebrmbajtjen e \/proc\/self\/mountinfo dhe p\u00ebrpunon \u00e7do pik\u00eb montimi n\u00eb funksionin unit_name_path_escape(), ku kryhet operacioni strdupa(), i cili i vendos t\u00eb dh\u00ebnat n\u00eb stack dhe jo n\u00eb memorien e alokuar dinamikisht. Meqen\u00ebse madh\u00ebsia maksimale e stack-ut kufizohet p\u00ebrmes RLIMIT_STACK, p\u00ebrpunimi i nj\u00eb rruge tep\u00ebr t\u00eb madhe t\u00eb pik\u00ebs s\u00eb montimit \u00e7on n\u00eb rr\u00ebzimin e procesit PID1 dhe n\u00eb ndalimin e sistemit. P\u00ebr sulmin mund t\u00eb p\u00ebrdoret nj\u00eb modul shum\u00eb i thjesht\u00eb FUSE n\u00eb kombinim me p\u00ebrdorimin si pik\u00eb montimi t\u00eb nj\u00eb direktoriumi me nivel t\u00eb lart\u00eb folezimi, ku madh\u00ebsia e rrug\u00ebs tejkalon 8 MB.    <\/p>\n<p>Problemi shfaqet q\u00eb nga systemd 220 (prill 2015), tashm\u00eb \u00ebsht\u00eb eliminuar n\u00eb depozitorin kryesor t\u00eb systemd dhe \u00ebsht\u00eb rregulluar n\u00eb shp\u00ebrndarjet (Debian, Ubuntu, Fedora, RHEL, SUSE, Arch). Vlen t\u00eb theksohet se n\u00eb versionin systemd 248 exploiti nuk funksionon p\u00ebr shkak t\u00eb nj\u00eb gabimi n\u00eb kodin e systemd, i cili shkakton d\u00ebshtim gjat\u00eb p\u00ebrpunimit t\u00eb \/proc\/self\/mountinfo. Interesant \u00ebsht\u00eb edhe fakti q\u00eb n\u00eb vitin 2018 u shfaq nj\u00eb situat\u00eb e ngjashme dhe, gjat\u00eb p\u00ebrpjekjes p\u00ebr t\u00eb shkruar nj\u00eb exploit p\u00ebr cenueshm\u00ebrin\u00eb CVE-2018-14634 n\u00eb kernelin Linux, studiuesit e Qualys has\u00ebn n\u00eb tre cenueshm\u00ebri kritike n\u00eb systemd.<br \/>\n<br \/>Burimi: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55528\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Qualys \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0438 \u0434\u0435\u0442\u0430\u043b\u0438 \u0434\u0432\u0443\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u044e\u0449\u0438\u0445 \u044f\u0434\u0440\u043e Linux \u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u044b\u0439 \u043c\u0435\u043d\u0435\u0434\u0436\u0435\u0440 systemd. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u044f\u0434\u0440\u0435 (CVE-2021-33909) \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u0447\u0435\u0440\u0435\u0437 \u043c\u0430\u043d\u0438\u043f\u0443\u043b\u044f\u0446\u0438\u0438 \u0441 \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u0430\u043c\u0438 \u0431\u043e\u043b\u044c\u0448\u043e\u0439 \u0432\u043b\u043e\u0436\u0435\u043d\u043d\u043e\u0441\u0442\u0438. \u041e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u044c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0443\u0441\u0443\u0433\u0443\u0431\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u0435\u043c, \u0447\u0442\u043e \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044f\u043c \u0443\u0434\u0430\u043b\u043e\u0441\u044c \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u0438\u0442\u044c \u0440\u0430\u0431\u043e\u0447\u0438\u0435 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u044b, \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0438\u0435 \u0432 Ubuntu 20.04\/20.10\/21.04, Debian 11 \u0438 Fedora 34 \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-100806","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Qualys \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0438 \u0434\u0435\u0442\u0430\u043b\u0438 \u0434\u0432\u0443\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u044e\u0449\u0438\u0445 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