{"id":91251,"date":"2020-08-10T13:42:19","date_gmt":"2020-08-10T11:42:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-ghostscript-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-postscript-dokumenta"},"modified":"2020-08-10T13:42:19","modified_gmt":"2020-08-10T11:42:19","slug":"uyazvimost-v-ghostscript-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-postscript-dokumenta","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-ghostscript-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-postscript-dokumenta","title":{"rendered":"Zranitelnost v Ghostscript, kter\u00e1 umo\u017e\u0148uje vykon\u00e1n\u00ed k\u00f3du p\u0159i otev\u0159en\u00ed PostScript dokumentu.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V Ghostscript, sad\u011b n\u00e1stroj\u016f pro zpracov\u00e1n\u00ed, p\u0159evod a generaci dokument\u016f ve form\u00e1tech PostScript a PDF, byla odhalena<\/a><\/noindex> zranitelnost (CVE-2020-15900<\/a><\/noindex>), co\u017e m\u016f\u017ee v\u00e9st k zm\u011bn\u011b soubor\u016f a spu\u0161t\u011bn\u00ed libovoln\u00fdch p\u0159\u00edkaz\u016f p\u0159i otev\u0159en\u00ed speci\u00e1ln\u011b upraven\u00fdch dokument\u016f ve form\u00e1tu PostScript. Pou\u017eit\u00ed v dokumentu nestandardn\u00edho PostScript oper\u00e1toru rsearch<\/a><\/noindex> umo\u017e\u0148uje vyvolat p\u0159ete\u010den\u00ed typu uint32_t p\u0159i v\u00fdpo\u010dtu velikosti, p\u0159epsat oblasti pam\u011bti mimo vyhrazen\u00fd buffer a z\u00edskat p\u0159\u00edstup k soubor\u016fm v FS, co\u017e lze vyu\u017e\u00edt k proveden\u00ed \u00fatoku na spu\u0161t\u011bn\u00ed libovoln\u00e9ho k\u00f3du v syst\u00e9mu (nap\u0159\u00edklad p\u0159id\u00e1n\u00edm p\u0159\u00edkaz\u016f do ~\\ .bashrc nebo ~\\ .profile).<\/p>\n

Probl\u00e9m se t\u00fdk\u00e1 verz\u00ed<\/a><\/noindex> od 9.50 do 9.52 (chyba je p\u0159\u00edtomno<\/a><\/noindex> od verz\u00ed 9.28rc1, ale podle informac\u00ed<\/a><\/noindex> odhaluj\u00edc\u00edch zranitelnost v\u00fdzkumn\u00edk\u016f, se projevuje od verze 9.50).<\/p>\n

Oprava byla navr\u017eena ve verzi 9.52.1<\/a><\/noindex> (patch<\/a><\/noindex>). Aktualizace bal\u00ed\u010dk\u016f s opravou byly ji\u017e vyd\u00e1ny pro Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, SUSE<\/a><\/noindex>. Bal\u00ed\u010dky v RHEL<\/a><\/noindex> na probl\u00e9my nejsou n\u00e1chyln\u00e9.<\/p>\n

P\u0159ipom\u00edn\u00e1me, \u017ee zranitelnosti v Ghostscript p\u0159edstavuj\u00ed zv\u00fd\u0161en\u00e9 riziko, proto\u017ee tento bal\u00ed\u010dek se pou\u017e\u00edv\u00e1 v mnoha popul\u00e1rn\u00edch aplikac\u00edch pro zpracov\u00e1n\u00ed form\u00e1t\u016f PostScript a PDF. Nap\u0159\u00edklad Ghostscript je vol\u00e1no p\u0159i vytv\u00e1\u0159en\u00ed miniatur na pracovn\u00ed plo\u0161e, p\u0159i pozad\u00ed indexace dat a p\u0159i p\u0159evodu obr\u00e1zk\u016f. Pro \u00fasp\u011b\u0161n\u00fd \u00fatok je \u010dasto dostate\u010dn\u00e9 pouze nahr\u00e1t soubor s exploit a prohl\u00e9dnout si adres\u00e1\u0159 s n\u00edm v Nautilus. Zranitelnosti v Ghostscript lze tak\u00e9 zneu\u017e\u00edt prost\u0159ednictv\u00edm zpracovatel\u016f obr\u00e1zk\u016f zalo\u017een\u00fdch na bal\u00edc\u00edch ImageMagick a GraphicsMagick, tak \u017ee se do nich p\u0159ed\u00e1 JPEG nebo PNG soubor, ve kter\u00e9m je m\u00edsto obr\u00e1zku k\u00f3d PostScript (takov\u00fd soubor bude zpracov\u00e1n v Ghostscript, proto\u017ee MIME typ je rozpozn\u00e1v\u00e1n podle obsahu, nikoliv podle p\u0159\u00edpony).<\/p>\n

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

Zdroj: 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 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-15900), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044e \u0444\u0430\u0439\u043b\u043e\u0432 \u0438 \u0437\u0430\u043f\u0443\u0441\u043a\u0443 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0445 \u043a\u043e\u043c\u0430\u043d\u0434 \u043f\u0440\u0438 \u043e\u0442\u043a\u0440\u044b\u0442\u0438\u0438 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 \u0434\u043e\u043a\u0443\u043c\u0435\u043d\u0442\u043e\u0432 \u0432 \u0444\u043e\u0440\u043c\u0430\u0442\u0435 PostScript. \u0418\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0432 \u0434\u043e\u043a\u0443\u043c\u0435\u043d\u0442\u0435 \u043d\u0435\u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u043e\u0433\u043e PostScript-\u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u0430 rsearch \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0442\u0438\u043f\u0430 uint32_t \u043f\u0440\u0438 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u0438 \u0440\u0430\u0437\u043c\u0435\u0440\u0430, \u043f\u0435\u0440\u0435\u043f\u0438\u0441\u0430\u0442\u044c \u043e\u0431\u043b\u0430\u0441\u0442\u0438 \u043f\u0430\u043c\u044f\u0442\u0438 \u0432\u043d\u0435 \u0432\u044b\u0434\u0435\u043b\u0435\u043d\u043d\u043e\u0433\u043e […]<\/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-91251","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\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\udd47Zranitelnost v Ghostscript, kter\u00e1 umo\u017e\u0148uje vykonat k\u00f3d p\u0159i otev\u0159en\u00ed dokumentu PostScript | ProHoster","description":"V Ghostscript, sad\u011b n\u00e1stroj\u016f pro zpracov\u00e1n\u00ed, p\u0159evod a generaci dokument\u016f ve form\u00e1tech PostScript a PDF,","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-ghostscript-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-postscript-dokumenta","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","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 Ghostscript, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u043f\u0440\u0438 \u043e\u0442\u043a\u0440\u044b\u0442\u0438\u0438 PostScript-\u0434\u043e\u043a\u0443\u043c\u0435\u043d\u0442\u0430 | ProHoster","og:description":"\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,","og:url":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-ghostscript-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-postscript-dokumenta","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2020-08-10T11:42:19+00:00","article:modified_time":"2020-08-10T11:42:19+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"91251","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":null,"schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":null,"breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2021-02-28 12:31:22","updated":"2022-10-13 08:06:29","focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/91251","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/comments?post=91251"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/91251\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/media?parent=91251"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/categories?post=91251"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/tags?post=91251"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}