{"id":55921,"date":"2020-02-01T00:00:00","date_gmt":"2020-01-31T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/root-uyazvimost-v-sudo-zatragivayushhaya-linux-mint-i-elementary-os"},"modified":"2020-02-18T14:04:05","modified_gmt":"2020-02-18T11:04:05","slug":"root-uyazvimost-v-sudo-zatragivayushhaya-linux-mint-i-elementary-os","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/root-uyazvimost-v-sudo-zatragivayushhaya-linux-mint-i-elementary-os","title":{"rendered":"Root-haavatavus sudo-s, mis m\u00f5jutab Linux Mint'i ja Elementary OS'i","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Utilities sudo<\/a><\/noindex>, which is used to organize the execution of commands on behalf of other users, tuvastatud<\/a><\/noindex> haavatavus (CVE-2019-18634<\/a><\/noindex>), mis v\u00f5imaldab t\u00f5sta oma privileege s\u00fcsteemis kasutajaks root. Probleem ilmneb alates versioonist sudo 1.7.1 ainult juhul, kui failis \/etc\/sudoers on aktiveeritud valik «pwfeedback», mis on vaikimisi v\u00e4ljal\u00fclitatud, kuid aktiveeritud m\u00f5nedes jaotustes, nagu Linux Mint ja Elementary OS. Probleem on lahendatud versioonis sudo 1.8.31<\/a><\/noindex>, mis avaldati m\u00f5ned tunnid tagasi. Jaotustes j\u00e4\u00e4b haavatavus siiski parandamata.<\/p>\n

Valik «pwfeedback» lubab kuvada s\u00fcmbolit «*» iga sisestatud s\u00fcmboli j\u00e4rel parooli sisestamisel. Selle t\u00f5ttu vigade t\u00f5ttu<\/a><\/noindex> selle getln() funktsiooni rakenduses, mis on m\u00e4\u00e4ratletud failis tgetpass.c, v\u00f5ib teatud tingimustel liiga suur parool, mis edastatakse standardse sisendi kaudu (stdin), mahtuda eraldatud puhvrisse ja \u00fcle kirjutada muid andmeid virnas. \u00dclevool tekib sudo koodi k\u00e4ivitamisel root-\u00f5igustega.<\/p>\n

Probleemi olemus seisneb selles, et kui kasutatakse spetsiaalset s\u00fcmbolit ^U (rea puhastamine) ja salvestamise operatsioon eba\u00f5nnestub, siis kood, mis vastutab v\u00e4ljastatud s\u00fcmbolite «*» puhastamise eest, taastab andmete k\u00e4ttesaadava suuruse puhvris, kuid ei naasta algsesse asendisse praeguse positsiooni osas puhvris. Teiseks teguriks, mis soodustab \u00e4rakasutamist, on re\u017eiimi «pwfeedback» automaatse v\u00e4ljal\u00fclitamise puudumine, kui andmed tulevad mitte terminalist, vaid sisendvoolust (see puudus v\u00f5imaldab luua tingimused kirjutamisvea tekkimiseks, n\u00e4iteks \u00fchesuunalistes s\u00fcsteemides) nimetamata kanalid<\/a><\/noindex> viga ilmneb katse korral kirjutada kanali l\u00f5ppu lugemiseks).<\/p>\n

Kuna r\u00fcndajal on t\u00e4ielik kontroll andmete kirjutamise \u00fcle virna, ei ole keeruline luua \u00e4rakasutamist, mis v\u00f5imaldab t\u00f5sta oma privileege kuni kasutajani root. Probleemi saab \u00e4ra kasutada iga kasutaja s\u00f5ltumata \u00f5igustest sudo kasutamiseks ja isiklikest seadistustest sudoers-is. Probleemi t\u00f5kestamiseks tuleks veenduda, et \/etc\/sudoers failis ei oleks seadistust «pwfeedback» ja vajadusel see v\u00e4lja l\u00fclitada («Defaults !pwfeedback»). Probleemi olemasolu kontrollimiseks saab k\u00e4itada koodi:<\/p>\n

$ perl -e ‘print((«A» x 100 . «\x{00}») x 50)’ | sudo -S id
\n Parool: Segmenteerimisviga<\/p>\n

<\/a><\/noindex><\/p>\n

Allikas: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 sudo, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u043e\u0439 \u0434\u043b\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u043c\u0430\u043d\u0434 \u043e\u0442 \u0438\u043c\u0435\u043d\u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2019-18634), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0434\u043e \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f root. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u0432\u044b\u043f\u0443\u0441\u043a\u0430 sudo 1.7.1 \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0432 \u0444\u0430\u0439\u043b\u0435 \/etc\/sudoers \u043e\u043f\u0446\u0438\u0438 «pwfeedback», \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043e\u0442\u043a\u043b\u044e\u0447\u0435\u043d\u0430 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e, \u043d\u043e \u0430\u043a\u0442\u0438\u0432\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u0432 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445, \u0442\u0430\u043a\u0438\u0445 \u043a\u0430\u043a Linux Mint \u0438 Elementary OS. […]<\/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-55921","post","type-post","status-publish","format-standard","hentry","category-news"],"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\udd47Root-haavatavus sudos, mis m\u00f5jutab Linux Mint ja Elementary OS | ProHoster","description":"Sudo utiliid, mida kasutatakse k\u00e4su sooritamiseks teiste kasutajate 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