{"id":104866,"date":"2022-08-17T09:36:49","date_gmt":"2022-08-17T07:36:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-ustrojstvah-na-baze-soc-realtek-pozvolyayushhaya-vypolnit-kod-cherez-otpravku-udp-paketa"},"modified":"2022-08-17T09:36:49","modified_gmt":"2022-08-17T07:36:49","slug":"uyazvimost-v-ustrojstvah-na-baze-soc-realtek-pozvolyayushhaya-vypolnit-kod-cherez-otpravku-udp-paketa","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/uyazvimost-v-ustrojstvah-na-baze-soc-realtek-pozvolyayushhaya-vypolnit-kod-cherez-otpravku-udp-paketa","title":{"rendered":"Haavatavus seadmetes, mis p\u00f5hinevad SoC Realtek, v\u00f5imaldab koodi t\u00e4itmist UDP-paketi saatmise kaudu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Faraday Securityi uurijad esitlesid DEFCON konverentsil \u00fcksikasju kriitilise haavatavuse (CVE-2022-27255) ekspluateerimise kohta Realtek RTL819x kiipide SDK-s, mis v\u00f5imaldab oma koodi seadmesse sisestada spetsiaalselt vormindatud UDP-paketi saatmise kaudu. Haavatavus on t\u00e4helepanuv\u00e4\u00e4rne selle poolest, et see v\u00f5imaldab r\u00fcnnata seadmeid, millel on externetele v\u00f5rkudele suletud web-liidese juurdep\u00e4\u00e4s \u2014 r\u00fcnnaku teostamiseks piisab lihtsalt \u00fche UDP-paketi saatmisest.    <\/p>\n<p>Haavatavus m\u00f5jutab seadmeid, kus kasutatakse haavatavaid versioone Realteki SDK-st, sealhulgas eCos RSDK 1.5.7p1 ja MSDK 4.9.4p1. eCos SDK haavatavuse parandamise uuendused avaldati Realteki poolt 25. m\u00e4rtsil. Hetkel ei ole selge, millised seadmed probleemiga kokku puutuvad \u2014 SoC Realtek RTL819x kasutatakse \u00fcle 60 tootja, sealhulgas Asus, A-Link, Beeline, Belkin, Buffalo, D-Link, Edison, Huawei, LG, Logitec, MT-Link, Netgear, Smartlink, UPVEL, ZTE ja Zyxel, v\u00f5rgu ruuterites, ligip\u00e4\u00e4supunktides, WiFi-signaali v\u00f5imendites, IP-kaamerates, asjade interneti seadmetes ja muudes v\u00f5rguseadmetes.     <\/p>\n<p>Avalikustatus on juba avaldatud n\u00e4iteid ekploitide kohta, et saada kaugjuurdep\u00e4\u00e4s seadmele ja t\u00e4ita oma k\u00e4ske r\u00fcnnaku n\u00e4itel Nexxt Nebula 300 Plus ruuteril. T\u00e4iendavalt on avaldatud utiliidid, et anal\u00fc\u00fcsida p\u00fcsivarasi haavatavuse osas.     <\/p>\n<p>V\u00f5ttes arvesse probleemide ettevalmistamist ja tarnimist ning p\u00fcsivara v\u00e4rskendusi juba v\u00e4ljastatud seadmetele, eeldatakse, et varsti ilmuvad automatiseeritud r\u00fcnnakud ja ussid, mis kahjustavad haavatavaid v\u00f5rgu seadmeid. P\u00e4rast eduka r\u00fcnnaku toimet kaubeldud seadmeid saavad kurjategijad kasutada n\u00e4iteks botnetide loomiseks, tagaukse sisestamiseks, et j\u00e4tta avarust ettev\u00f5tte sisev\u00f5rku, \u00fclemineku liikluse pealtkuulamiseks v\u00f5i suunamiseks v\u00e4lisele hostile.    <\/p>\n<p>Haavatavus tuleneb puhverserveri \u00fclekandmisest \u201eSIP ALG\u201d (SIP rakenduskiht Gateway) moodulis, mis on kasutusel SIP-pakettide edastamise korraldamiseks aadressit\u00f5lke tagant. Probleem tekkis seet\u00f5ttu, et ei kontrollitud tegelikku saadud andmete suurust, mis toob kaasa m\u00e4luala \u00fclekirjutamise fikseeritud puhverserveri piire \u00fcletavas kopeerimisfunktsiooni (strcpy) kutsumise ajal SIP-pakettide t\u00f6\u00f6tlemisel. R\u00fcnnakut saab sooritada, saates UDP-paketti, mille andmeplokis v\u00f5i SIP-protokolli p\u00e4ises on ebat\u00e4psed v\u00e4li v\u00e4\u00e4rtused. Ekspluateerimiseks on piisav saata \u00fcks pakk mis tahes UDP-porti WAN-liidesele.      <center>  <video controls=\"\" style=\"width: 700px; height: 400px; max-width:100%\"><source src=\"https:\/\/github.com\/infobyte\/cve-2022-27255\/raw\/main\/DEFCON\/poc.mp4\" type=\"video\/mp4\"><\/video>  <\/center>    <\/p>\n<p>Kaitse soovituslikuks meetodiks on blokeerida tulem\u00fc\u00fcris v\u00f5i v\u00f5rgur\u00fcnnakute ennetuss\u00fcsteemis UDP-paketid, millel on SIP-s\u00f5num \u201eINVITE\u201d, mille rida on \u201em=audio\u201d ja mille suurus on \u00fcle 128 baiti. N\u00e4ide reeglist, et tuvastada ekspluateerimise katseid IDS Snort 3: alert udp any any -&gt; any any (sid:1000000; msg:\"Realtek eCOS SDK SIP Traffic Exploit CVE-2022-27255\"; content: \"invite\"; depth: 6; nocase; content: \"m=audio \"; isdataat: 128,relative; content:!\"|0d|\"; within: 128;)<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=57645\">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 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Faraday Security \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0438 \u043d\u0430 \u043a\u043e\u043d\u0444\u0435\u0440\u0435\u043d\u0446\u0438\u0438 DEFCON \u0434\u0435\u0442\u0430\u043b\u0438 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2022-27255) \u0432 SDK \u0434\u043b\u044f \u0447\u0438\u043f\u043e\u0432 Realtek RTL819x, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0434 \u043d\u0430 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0435 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e UDP-\u043f\u0430\u043a\u0435\u0442\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u0430 \u0442\u0435\u043c, \u0447\u0442\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0430\u0442\u0430\u043a\u043e\u0432\u0430\u0442\u044c \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043e\u0442\u043a\u043b\u044e\u0447\u0451\u043d \u0434\u043e\u0441\u0442\u0443\u043f \u0432 web-\u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441 \u0434\u043b\u044f \u0432\u043d\u0435\u0448\u043d\u0438\u0445 \u0441\u0435\u0442\u0435\u0439 &#8212; \u0434\u043b\u044f \u0430\u0442\u0430\u043a\u0438 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u043f\u0440\u043e\u0441\u0442\u043e \u043e\u0442\u043f\u0440\u0430\u0432\u0438\u0442\u044c \u043e\u0434\u0438\u043d UDP-\u043f\u0430\u043a\u0435\u0442. [&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-104866","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Faraday Security \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0438 \u043d\u0430 \u043a\u043e\u043d\u0444\u0435\u0440\u0435\u043d\u0446\u0438\u0438 DEFCON \u0434\u0435\u0442\u0430\u043b\u0438 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 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