networkd-dispatcher'iga seotud taustaprotsess t\u00f6\u00f6tab root'i \u00f5igustes ja v\u00f5tab s\u00fcndmuste signaale vastu D-Bus'i kaudu. Teave, mis on seotud v\u00f5rgu\u00fchenduste olekumuutuste s\u00fcndmustega, saadetakse teenuse systemd-networkd poolt. Probleem on selles, et mitteprivilegeeritud kasutajad saavad genereerida s\u00fcndmuse mitteeksisteerivast olekust ja algatada oma skripti k\u00e4ivitamise, mis t\u00e4idetakse root'i \u00f5igustes. <\/p>\n
Systemd-networkd on m\u00f5eldud ainult s\u00fcsteemsete skriptide t\u00f6\u00f6tamiseks, mis asuvad kataloogis \/etc\/networkd-dispatcher ja ei ole kasutaja poolt asendatavad. Siiski oli turvaauk (CVE-2022-29799) seotud faili tee t\u00f6\u00f6tlemise koodiga, mis v\u00f5imaldas p\u00e4\u00e4seda v\u00e4lja baasdirektoraali ja k\u00e4ivitada juhuslikke skripte. Eelk\u00f5ige kasutati skripti faili tee vormimisel D-Bus'i kaudu edastatud v\u00e4\u00e4rtusi OperationalState ja AdministrativeState, kus ei viidud l\u00e4bi erim\u00e4rkide puhastamist. R\u00fcndaja v\u00f5is genereerida oma oleku, mille nimes olid s\u00fcmbolid \u00ab..\/\u00bb ja suunata networkd-dispatcheri p\u00e4ringu teise katalooge. <\/p>\n
Teine turvaauk (CVE-2022-29800) on seotud v\u00f5istlustingimusega \u2014 skripti parameetrite kontrollimise (root'i kuuluvus) ja selle k\u00e4ivitamise vahel oli v\u00e4ike ajaaken, mis oli piisav faili asendamiseks ja skripti kuuluvuse kontrolli \u00fcmberminekuks. Lisaks puudus networkd-dispatcheris kontroll s\u00fcmboolsete linkide \u00fcle, sealhulgas skriptide k\u00e4ivitamisel subprocess.Popen'i kutsete kaudu, mis lihtsustas r\u00fcnnaku korraldamist oluliselt. <\/p>\n
Eksploiteerimise tehnika: <\/p>\n
- \n
- Luues katalooge \u00ab\/tmp\/nimbuspwn\u00bb ja s\u00fcmboolset linki \u00ab\/tmp\/nimbuspwn\/poc.d\u00bb, mis viitab kataloogile \u00ab\/sbin\u00bb, mis on kasutusel k\u00e4ivitatavate failide tuvastamiseks, mis kuuluvad root'ile.\n
- K\u00e4ivitatavate failide jaoks kataloogist \u00ab\/sbin\u00bb luuakse sarnase nimega failid kataloogis \u00ab\/tmp\/nimbuspwn\u00bb, n\u00e4iteks faili \u00ab\/sbin\/vgs\u00bb jaoks luuakse k\u00e4ivitatav fail \u00ab\/tmp\/nimbuspwn\/vgs\u00bb, mis kuulub mitteprivileegitud kasutajale, kuhu paigutatakse kood, mida r\u00fcndaja soovib k\u00e4ivitada.\n
- D-Bus'i kaudu saadetakse processile networkd-dispatcher signaal, kus OperationalState v\u00e4\u00e4rtuseks on \u00ab..\/..\/..\/tmp\/nimbuspwn\/poc\u00bb. Signaali saatmiseks nimedespetsiaalses \u00aborg.freedesktop.network1\u00bb kasutati v\u00f5imalust sisestada enda t\u00f6\u00f6tlejad systemd-networkd'le, n\u00e4iteks gpgv v\u00f5i epmd manipuleerimisega, v\u00f5i v\u00f5idakse kasutada, et systemd-networkd ei ole vaikimisi k\u00e4ivitatud (n\u00e4iteks Linux Mintis).\n
- P\u00e4rast signaali vastuv\u00f5tmist koostab Networkd-dispatcher nimekirja k\u00e4ivitatavatest failidest, mis kuuluvad kasutajale root ja on juurdep\u00e4\u00e4setavad kataloogis \u00ab\/etc\/networkd-dispatcher\/..\/..\/..\/tmp\/nimbuspwn\/poc.d\u00bb, mis tegelikult osutab \u00ab\/sbin\u00bb.\n
- Hetkel, mil failide nimekiri on saadud, kuid skript ei ole veel k\u00e4ivitunud, suunatakse s\u00fcmboolne link aadressilt «\/tmp\/nimbuspwn\/poc.d» aadressile «\/tmp\/nimbuspwn» ja networkd-dispatcher k\u00e4ivitab r\u00fcndaja paigutatud skripti root \u00f5igustes. <\/ul>\n
![\"Turvaaugud](\"\/wp-content\/uploads\/2022\/04\/15109315e192eb6384601dfafc436775.jpg\")
<\/center>
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"\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 Microsoft \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0434\u0432\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2022-29799, CVE-2022-29800) \u0432 \u0441\u0435\u0440\u0432\u0438\u0441\u0435 networkd-dispatcher, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0438\u0435 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f Nimbuspwn \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\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 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0435 \u043a\u043e\u043c\u0430\u043d\u0434\u044b \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0435 networkd-dispatcher 2.2. \u0418\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u043e \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0439 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u043c\u0438 \u043f\u043e\u043a\u0430 \u043d\u0435\u0442 (Debian, RHEL, Fedora, SUSE, Ubuntu, Arch Linux). Networkd-dispatcher \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \u0432\u043e \u043c\u043d\u043e\u0433\u0438\u0445 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 Linux, \u0432\u043a\u043b\u044e\u0447\u0430\u044f Ubuntu, […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":103886,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-103885","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Haavatavused networkd-dispatcheris, mis v\u00f5imaldavad saada root'i \u00f5igusi | ProHoster","description":"Microsofti turvauurijad avastasid kaks haavatavust (CVE-2022-29799, CVE-2022-29800) teenuses networkd-dispatcher, mille koodnimi on Nimbuspwn. Need v\u00f5imaldavad mitteprivilegeeritud kasutajal k\u00e4ivitada suvalisi k\u00e4ske root \u00f5igustes. Probleem on lahendatud networkd-dispatcher versioonis 2.2. Teavet distribuutide (Debian, RHEL, Fedora, SUSE, Ubuntu, Arch Linux) v\u00e4rskenduste v\u00e4ljaandmise kohta ei ole veel saadaval. Networkd-dispatcherit kasutatakse paljudes Linuxi distributsioonides, sealhulgas Ubuntu.","canonical_url":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/uyazvimosti-v-networkd-dispatcher-pozvolyayushhie-poluchit-prava-root","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"et_EE","og:site_name":"ProHoster | \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","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 networkd-dispatcher, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root | ProHoster","og:description":"\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 Microsoft \u0432\u044b\u044f\u0432\u0438\u043b\u0438 \u0434\u0432\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2022-29799, CVE-2022-29800) \u0432 \u0441\u0435\u0440\u0432\u0438\u0441\u0435 networkd-dispatcher, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0438\u0435 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f Nimbuspwn \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\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 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0435 \u043a\u043e\u043c\u0430\u043d\u0434\u044b \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0435 networkd-dispatcher 2.2. \u0418\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u043e \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0439 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u043c\u0438 \u043f\u043e\u043a\u0430 \u043d\u0435\u0442 (Debian, RHEL, Fedora, SUSE, Ubuntu, Arch Linux). 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