{"id":99421,"date":"2021-03-13T22:22:39","date_gmt":"2021-03-13T20:22:40","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-podsisteme-iscsi-yadra-linux-pozvolyayushhaya-podnyat-svoi-privilegii"},"modified":"2021-03-13T22:22:39","modified_gmt":"2021-03-13T20:22:40","slug":"uyazvimost-v-podsisteme-iscsi-yadra-linux-pozvolyayushhaya-podnyat-svoi-privilegii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/uyazvimost-v-podsisteme-iscsi-yadra-linux-pozvolyayushhaya-podnyat-svoi-privilegii","title":{"rendered":"Haavatavus Linuxi kernel'i iSCSI alam s\u00fcsteemis, mis v\u00f5imaldab t\u00f5sta enda privileege.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Linuxi iSCSI alamooduli koodis avastati haavatavus (CVE-2021-27365), mis v\u00f5imaldab tavalistel kohalikelt kasutajatel k\u00e4ivitada koodi tuumatasemel ja saada s\u00fcsteemis root-\u00f5igusi. Testimiseks on saadaval eksploitatsiooni t\u00f6\u00f6tav protot\u00fc\u00fcp. Haavatavus on k\u00f5rvaldatud Linuxi tuuma versioonides 5.11.4, 5.10.21, 5.4.103, 4.19.179, 4.14.224, 4.9.260 ja 4.4.260. Pakettide uuendused tuumaga on saadaval distributsioonides Debian, Ubuntu, SUSE\/openSUSE, Arch Linux ja Fedora. RHEL jaoks pole veel parandusi v\u00e4lja antud.        <\/p>\n<p>Probleem tuleneb defektist funktsioonis iscsi_host_get_param(), mis kuulub libiscsi moodulisse ja lisati 2006. aastal iSCSI alamooduli arendamise k\u00e4igus. Piisava suuruse kontrolli puudumise t\u00f5ttu v\u00f5ivad m\u00f5ned iSCSI stringi atribuudid, nagu hostname v\u00f5i username, \u00fcletada v\u00e4\u00e4rtust PAGE_SIZE (4 KB). Haavatavust saab kasutada, saates tavalise kasutaja Netlink- s\u00f5numeid, mis seavad iSCSI atribuudid v\u00e4\u00e4rtusteks, mis \u00fcletavad PAGE_SIZE. Atribuutide lugemisel l\u00e4bi sysfs v\u00f5i seqfs kutsutakse v\u00e4lja kood, mis edastab atribuudid sprintf-funktsioonile kopeerimiseks puhvri suurusega PAGE_SIZE.               <\/p>\n<p>Haavatavuse kasutamine distributsioonides s\u00f5ltub sellest, kas moduli scsi_transport_iscsi automaatne laadimine toetatakse, kui proovida luua NETLINK_ISCSI sokket. Distributsioonides, kus see moodul laaditakse automaatselt, saab r\u00fcnnaku l\u00e4bi viia s\u00f5ltumatult iSCSI funktsionaalsuse kasutamisest. Samas on exploiti edukaks rakendamiseks vajalik registreerida v\u00e4hemalt \u00fcks iSCSI transport. Transportide registreerimiseks saab kasutada kernel moodulit ib_iser, mis laaditakse automaatselt, kui proovida luua tavalise kasutaja NETLINK_RDMA sokket.     <\/p>\n<p>Automaatne vajalike moodulite laadimine exploiti rakendamiseks toetatakse CentOS 8, RHEL 8 ja Fedora s\u00fcsteemides, kui installitakse rdma-core paketid, mis on s\u00f5ltuvus m\u00f5nede populaarsete paketide jaoks ja installitakse vaikimisi t\u00f6\u00f6stusjaamade, GUI serverite ja virtuaalhostide keskkondade konfigureerimiste korral. Samas ei installita rdma-core serveri ehituse kasutamisel, mis t\u00f6\u00f6tab ainult konsoolis, ja minimaalse installi pildiga. N\u00e4iteks on pakett osa Fedora 31 Workstation'i p\u00f5hivarustusest, kuid ei kuulu Fedora 31 Serverisse. Debian ja Ubuntu on v\u00e4hem haavatavad, kuna rdma-core pakett laadib haavatavuse jaoks vajalikud kernelimoodulid ainult siis, kui RDMA riistvara on olemas.      <center><img decoding=\"async\" alt=\"Haavatavus Linuxi kernel&#039;i iSCSI alam s\u00fcsteemis, mis v\u00f5imaldab t\u00f5sta enda privileege.\" src=\"\/wp-content\/uploads\/2021\/03\/3976683ce11a1f5745c19369237c975c.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <\/p>\n<p>\u0412 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043e\u0431\u0445\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0443\u0442\u0438 \u0437\u0430\u0449\u0438\u0442\u044b \u043c\u043e\u0436\u043d\u043e \u0437\u0430\u043f\u0440\u0435\u0442\u0438\u0442\u044c \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0443\u044e \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0443 \u043c\u043e\u0434\u0443\u043b\u044f libiscsi:       echo &#171;install libiscsi \/bin\/true&#187; &gt;&gt; \/etc\/modprobe.d\/disable-libiscsi.conf      <\/p>\n<p>\u0414\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u043e, \u0432 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 iSCSI \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u044b \u0435\u0449\u0451 \u0434\u0432\u0435 \u043c\u0435\u043d\u0435\u0435 \u043e\u043f\u0430\u0441\u043d\u044b\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043c\u043e\u0433\u0443\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0443\u0442\u0435\u0447\u043a\u0435 \u0434\u0430\u043d\u043d\u044b\u0445 \u0438\u0437 \u044f\u0434\u0440\u0430: CVE-2021-27363  (\u0443\u0442\u0435\u0447\u043a\u0430 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u0439 \u043e \u0434\u0435\u0441\u043a\u0440\u0438\u043f\u0442\u043e\u0440\u0435 \u0442\u0440\u0430\u043d\u0441\u043f\u043e\u0440\u0442\u0430 iSCSI \u0447\u0435\u0440\u0435\u0437 sysfs) \u0438  CVE-2021-27364 (\u0447\u0442\u0435\u043d\u0438\u0435 \u0438\u0437 \u043e\u0431\u043b\u0430\u0441\u0442\u0438 \u0432\u043d\u0435 \u0433\u0440\u0430\u043d\u0438\u0446 \u0431\u0443\u0444\u0435\u0440\u0430). \u0423\u043a\u0430\u0437\u0430\u043d\u043d\u044b\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043c\u043e\u0433\u0443\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u0432\u0437\u0430\u0438\u043c\u043e\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u044f \u0447\u0435\u0440\u0435\u0437 netlink-\u0441\u043e\u043a\u0435\u0442 \u0441 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u043e\u0439  iSCSI  \u0431\u0435\u0437 \u043d\u0430\u043b\u0438\u0447\u0438\u044f \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u044b\u0445 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0439. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u043c\u043e\u0436\u0435\u0442 \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0438\u0442\u044c\u0441\u044f \u043a iSCSI \u0438 \u043e\u0442\u043f\u0440\u0432\u0438\u0442\u044c \u043a\u043e\u043c\u0430\u043d\u0434\u0443 &#171;end a session&#187; \u0434\u043b\u044f \u043e\u0431\u0440\u044b\u0432\u0430 \u0441\u0435\u0430\u043d\u0441\u0430.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=54754\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043a\u043e\u0434\u0435 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u044b iSCSI \u0438\u0437 \u0441\u043e\u0441\u0442\u0430\u0432\u0430 \u044f\u0434\u0440\u0430 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-27365), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u044f\u0434\u0440\u0430 \u0438 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c root-\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u0414\u043b\u044f \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u0440\u0430\u0431\u043e\u0447\u0438\u0439 \u043f\u0440\u043e\u0442\u043e\u0442\u0438\u043f \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 \u044f\u0434\u0440\u0430 Linux 5.11.4, 5.10.21, 5.4.103, 4.19.179, 4.14.224, 4.9.260 \u0438 4.4.260. \u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0441 \u044f\u0434\u0440\u043e\u043c \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u044b \u0432 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 Debian, Ubuntu, SUSE\/openSUSE, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":99422,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-99421","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u043a\u043e\u0434\u0435 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u044b iSCSI \u0438\u0437 \u0441\u043e\u0441\u0442\u0430\u0432\u0430 \u044f\u0434\u0440\u0430 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-27365), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f 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\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\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 iSCSI \u044f\u0434\u0440\u0430 Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0434\u043d\u044f\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 | ProHoster\" \/>\n\t\t<meta property=\"og:description\" content=\"\u0412 \u043a\u043e\u0434\u0435 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u044b iSCSI \u0438\u0437 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