{"id":103950,"date":"2022-05-04T15:37:02","date_gmt":"2022-05-04T13:37:03","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-uclibc-i-uclibc-ng-pozvolyayushhaya-podmenit-dannye-v-keshe-dns"},"modified":"2022-05-04T15:37:02","modified_gmt":"2022-05-04T13:37:03","slug":"uyazvimost-v-uclibc-i-uclibc-ng-pozvolyayushhaya-podmenit-dannye-v-keshe-dns","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/uyazvimost-v-uclibc-i-uclibc-ng-pozvolyayushhaya-podmenit-dannye-v-keshe-dns","title":{"rendered":"Haavatavus uClibc ja uClibc-ng, mis v\u00f5imaldab DNS-i vahem\u00e4lu andmeid asendada.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Standardset uClibc ja uClibc-ng C-raamatukogudes, mida kasutatakse paljudes sisseehitatud ja portatiivsetes seadmetes, on tuvastatud haavatavus (CVE ei ole m\u00e4\u00e4ratud), mis v\u00f5imaldab valeandmeid DNS-i vahem\u00e4llu sisestada, v\u00f5imaldades suunata m\u00f5ne domeeni IP-aadressi vahem\u00e4lu r\u00fcndaja serverile. <\/p>\n

Probleem m\u00f5jutab erinevaid Linuxi p\u00fcsivara marsruuterite, juurdep\u00e4\u00e4supunktide ja asjade interneti seadmete jaoks, samuti sisseehitatud s\u00fcsteemide Linuxi jaotusi, nagu OpenWRT ja Embedded Gentoo. On m\u00e4rgatud, et haavatavus avaldub paljude tootjate seadmetes (nt uClibc kasutatakse Linksysi, Netgeari ja Axis'e p\u00fcsivara versioonides), kuid kuna uClibc ja uClibc-ng haavatavus j\u00e4\u00e4b lahendamata, ei avaldata hetkel \u00fcksikasjalikke teavet konkreetselt seadmete ja tootjate kohta, mille tooted seda probleemi sisaldavad. <\/p>\n

Haavatavus tuleneb DNS-p\u00e4ringute saatmise koodis ettearvatavate tehinguidentifikaatorite kasutamisest. DNS-p\u00e4ringu identifikaator valiti lihtsalt loenduri suurendamise teel, ilma et portide numbrite lisarandomiseerimist kasutataks, mis v\u00f5imaldas DNS-i vahem\u00e4lu r\u00fcndamist vale vastustega UDP-pakettide ennetava saatmise kaudu (vastus v\u00f5etakse vastu, kui see saabus enne reaalset vastust ja sisaldab \u00f5iget ID-d). serverile<\/a> Erinevalt 2008. aastal Kaminski poolt ette pandud meetodist ei ole tehinguidentifikaatori arvamine vajalik, kuna see on algselt ettearvatav (alguses seotakse v\u00e4\u00e4rtus 1, mida iga p\u00e4ringu korral suurendatakse, mitte ei valita juhuslikult).

\"Haavatavus<\/center> <\/p>\n

Spetsifikatsioonis identifikaatori talitlush\u00e4irete vastu kaitsmiseks soovitatakse lisaks rakendada juhuslikku algsete v\u00f5rguportide numbrite jaotust, millest DNS-p\u00e4ringud saadetakse, et kompenseerida identifikaatori ebapiisavat suurust. Portsallika juhuslikkuse lubamisel vale vastuse genereerimisel tuleb v\u00e4lja valida mitte ainult 16-bitine identifikaator, vaid ka v\u00f5rguport. uClibc ja uClibc-ng ei sisaldanud selges\u00f5naliselt sellist juhuslikkust (bind'i kutsumisel ei m\u00e4\u00e4ratud juhuslikku l\u00e4htuva UDP porta) ning selle rakendamine s\u00f5ltus operatsioonis\u00fcsteemi seadistustest. <\/p>\n

Kui potirandimise v\u00e4lja l\u00fclitada, on inkrementaalse p\u00e4ringu identifikaatori m\u00e4\u00e4ramine triviaalne \u00fclesanne. Kuid isegi juhul, kui kasutatakse potirandimist, peab r\u00fcndaja vaid \u00e4ra arvama v\u00f5rguporta, mis j\u00e4\u00e4b vahemikku 32768\u201360999, mille jaoks v\u00f5ib kasutada massilist samal ajal valevastuste saatmist erinevatele v\u00f5rguportidele.

\"Haavatavus<\/center> <\/p>\n

Probleem on kinnitatud k\u00f5igis uClibc ja uClibc-ng viimastes versioonides, sealhulgas uClibc 0.9.33.2 ja uClibc-ng 1.0.40. Septembris 2021 saadeti haavatavuse teave CERT\/CC-le koosk\u00f5lastatud lahenduste ettevalmistamiseks. Jaanuaris 2022 edastati probleemiga seotud andmed rohkem kui 200 tootjale, kes teevad koost\u00f6\u00f6d CERT\/CC-ga. M\u00e4rtsis prooviti eraldi kontakteeruda uClibc-ng projekti arendajaga, kuid ta vastas, et ei suuda haavatavust iseseisvalt lahendada ja soovitas teavet probleemist avalikult levitada, lootes saada kogukonnalt abi lahenduse v\u00e4ljat\u00f6\u00f6tamisel. Tootjatest teatas NETGEAR haavatavuse lahendusega v\u00e4rskenduse v\u00e4ljalaskmisest.
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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Seda saab kasutada, et asendada mis tahes domeeni IP-aadress ja suunata p\u00e4ringud domained r\u00fcndaja serverisse. Probleem m\u00f5jutab erinevaid Linuxi jutu- ja seadmeid, sealhulgas ruutereid, juurdep\u00e4\u00e4supunkte ja asjade interneti seadmeid.","canonical_url":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/uyazvimost-v-uclibc-i-uclibc-ng-pozvolyayushhaya-podmenit-dannye-v-keshe-dns","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\u044c \u0432 uClibc \u0438 uClibc-ng, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f 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