{"id":101245,"date":"2021-09-10T22:22:37","date_gmt":"2021-09-10T20:22:37","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-ghostscript-ekspluatiruemaya-cherez-imagemagick"},"modified":"2021-09-10T22:22:37","modified_gmt":"2021-09-10T20:22:37","slug":"uyazvimost-v-ghostscript-ekspluatiruemaya-cherez-imagemagick","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/uyazvimost-v-ghostscript-ekspluatiruemaya-cherez-imagemagick","title":{"rendered":"Rikkumine Ghostscriptis, mida ekspluateeritakse l\u00e4bi ImageMagicki","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ghostscriptis, PostScripti ja PDF-i vormingus dokumentide t\u00f6\u00f6tlemiseks, konverteerimiseks ja genereerimiseks m\u00f5eldud t\u00f6\u00f6riistade kogus, avastati kriitiline haavatavus (CVE-2021-3781), mis v\u00f5imaldab k\u00e4ivitada kontrollimatut koodi spetsiaalselt kujundatud faili t\u00f6\u00f6tlemisel. Esmakordselt t\u00f5i probleemile t\u00e4helepanu Emil Lerner, kes r\u00e4\u00e4kis haavatavusest 25. augustil Peterburis toimunud konverentsil ZeroNights X (ettekandes r\u00e4\u00e4giti, kuidas Emil kasutas haavatavust bug bounty programmide raames AirBNB, Dropboxi ja Yandex.Near Estate'i teenuste r\u00fcnnakute demonstreerimiseks preemiate saamiseks). <\/p>\n

5. septembril ilmus avaliku juurdep\u00e4\u00e4su kaudu t\u00f6\u00f6tav eksploit, mis v\u00f5imaldab r\u00fcnnata Ubuntul 20.04 t\u00f6\u00f6tavaid s\u00fcsteeme, edastades serveris t\u00f6\u00f6tavale veebiskriptile, mis kasutab php-imagemagick paketti, spetsiaalselt kujundatud dokumenti, mis on \u00fcles laaditud pildi n\u00e4ol. Samuti \u00f6eldi, et selline eksploit oli tavakasutuses juba m\u00e4rtsist. Teatati GhostScript 9.50 s\u00fcsteemide r\u00fcndamise v\u00f5imalusest, kuid selgus, et haavatavus esineb ka k\u00f5ikides j\u00e4rgnevates versioonides GhostScript, sealhulgas arenduses oleva 9.55 v\u00e4ljaande puhul Gitist. <\/p>\n

Parandus tehti 8. septembril ja p\u00e4rast \u00fclevaatamist v\u00f5eti see GhostScripti reposse vastu 9. septembril. Paljudes jaotustes on probleem endiselt lahendamata (uuenduste avaldamise staatust saab vaadata lehtedelt Debian, Ubuntu, Fedora, SUSE, RHEL, Arch Linux, FreeBSD, NetBSD). GhostScripti v\u00e4ljaanne, mis k\u00f5rvaldada haavatavuse, plaanitakse avaldada kuu l\u00f5puks. <\/p>\n

\u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c\u044e \u043e\u0431\u0445\u043e\u0434\u0430 \u0440\u0435\u0436\u0438\u043c\u0430 \u0438\u0437\u043e\u043b\u044f\u0446\u0438\u0438 «-dSAFER» \u0438\u0437-\u0437\u0430 \u043d\u0435\u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e\u0439 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u043e\u0432 Postscript-\u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430 «%pipe%», \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0432\u0448\u0438\u0445 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0445 shell-\u043a\u043e\u043c\u0430\u043d\u0434. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0434\u043b\u044f \u0437\u0430\u043f\u0443\u0441\u043a\u0430 \u0443\u0442\u0438\u043b\u0438\u0442\u044b id \u0432 \u0434\u043e\u043a\u0443\u043c\u0435\u043d\u0442\u0435 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0443\u043a\u0430\u0437\u0430\u0442\u044c \u0441\u0442\u0440\u043e\u043a\u0443 «(%pipe%\/tmp\/&id)(w)file» \u0438\u043b\u0438 «(%pipe%\/tmp\/;id)(r)file». <\/p>\n

Tulet meelde, et Ghostscripti haavatavused on eriti ohtlikud, kuna seda paketti kasutatakse paljudes populaarsetes PostScripti ja PDF-i vormingute t\u00f6\u00f6tlemise rakendustes. N\u00e4iteks kutsutakse Ghostscripti t\u00f6\u00f6laua miniatuuride loomise, andmete taustindekseerimise ja piltide teisendamise protsessis. Eduka r\u00fcnnaku jaoks piisab paljudes juhtudel lihtsalt failiga, millel on eksploit, laadimisest v\u00f5i selle kaustaga \u00fclevaatamisest failihalduris, mis toetab dokumentide pisipiltide kuvamist, n\u00e4iteks Nautiluses. <\/p>\n

Ghostscripti haavatavusi saab kasutada ka ImageMagicki ja GraphicsMagicki p\u00f5hjal t\u00f6\u00f6tlevate pildit\u00f6\u00f6tlusprogrammide kaudu, edastades neile JPEG- v\u00f5i PNG-faili, milles pildi asemel on PostScripti kood (selline fail t\u00f6\u00f6deldakse Ghostscriptis, kuna MIME-t\u00fc\u00fcpi tuvastatakse sisu p\u00f5hjal, mitte tuginedes faililaiendusele).
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 Ghostscript, \u043d\u0430\u0431\u043e\u0440\u0435 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u043e\u0432 \u0434\u043b\u044f \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438, \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0438 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u0434\u043e\u043a\u0443\u043c\u0435\u043d\u0442\u043e\u0432 \u0432 \u0444\u043e\u0440\u043c\u0430\u0442\u0430\u0445 PostScript \u0438 PDF, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-3781), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0439 \u043a\u043e\u0434 \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0444\u0430\u0439\u043b\u0430. \u0418\u0437\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e \u043d\u0430 \u043d\u0430\u043b\u0438\u0447\u0438\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u043e\u0431\u0440\u0430\u0442\u0438\u043b \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u042d\u043c\u0438\u043b\u044c \u041b\u0435\u0440\u043d\u0435\u0440, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u0430\u043b \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 25 \u0430\u0432\u0433\u0443\u0441\u0442\u0430 \u043d\u0430 \u043f\u0440\u043e\u0448\u0435\u0434\u0448\u0435\u0439 \u0432 \u0421\u0430\u043d\u043a\u0442-\u041f\u0435\u0442\u0435\u0440\u0431\u0443\u0440\u0433\u0435 \u043a\u043e\u043d\u0444\u0435\u0440\u0435\u043d\u0446\u0438\u0438 ZeroNights X (\u0432 \u0434\u043e\u043a\u043b\u0430\u0434\u0435 \u0431\u044b\u043b\u043e \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u0430\u043d\u043e, \u043a\u0430\u043a \u042d\u043c\u0438\u043b\u044c […]<\/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-101245","post","type-post","status-publish","format-standard","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\udd47Haavatavus Ghostscriptis, mida kasutatakse ImageMagicki kaudu | ProHoster","description":"Ghostscriptis, PostScripti ja PDF-formaatide t\u00f6\u00f6tlemiseks, teisendamiseks ja genereerimiseks m\u00f5eldud t\u00f6\u00f6riistade komplektis, leiti kriitiline haavatavus (CVE-2021-3781), mis v\u00f5imaldab t\u00f5husalt t\u00e4ita v\u00e4ljastatud koodi spetsiaalselt vormindatud faili t\u00f6\u00f6tlemisel. 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