{"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\/hu\/blog\/news\/uyazvimost-v-ghostscript-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-postscript-dokumenta","title":{"rendered":"Sebezhet\u0151s\u00e9g a Ghostscript-ben, amely lehet\u0151v\u00e9 teszi a k\u00f3d v\u00e9grehajt\u00e1s\u00e1t PostScript dokumentum megnyit\u00e1sakor","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A Ghostscript, az PostScript \u00e9s PDF form\u00e1tum\u00fa dokumentumok feldolgoz\u00e1s\u00e1ra, \u00e1talak\u00edt\u00e1s\u00e1ra \u00e9s gener\u00e1l\u00e1s\u00e1ra szolg\u00e1l\u00f3 eszk\u00f6zk\u00e9szlet, identified<\/a><\/noindex> vulnerability (CVE-2020-15900<\/a><\/noindex>), ami f\u00e1jlok m\u00f3dos\u00edt\u00e1s\u00e1hoz \u00e9s \u00f6nk\u00e9nyes parancsok v\u00e9grehajt\u00e1s\u00e1hoz vezethet, ha k\u00fcl\u00f6n\u00f6sen form\u00e1zott PostScript-dokumentumokat nyitunk meg. A dokumentumban nem szabv\u00e1nyos PostScript-\u00fcgyfelek haszn\u00e1lata rsearch<\/a><\/noindex> lehet\u0151v\u00e9 teszi a uint32_t t\u00edpus\u00fa t\u00falcsordul\u00e1st a m\u00e9ret kisz\u00e1m\u00edt\u00e1sa sor\u00e1n, a mem\u00f3riater\u00fcletek fel\u00fclemelked\u00e9s\u00e9t egy lefoglalt pufferen k\u00edv\u00fcl, valamint a f\u00e1jlokhoz val\u00f3 hozz\u00e1f\u00e9r\u00e9st a f\u00e1jlrendszerben, amit fel lehet haszn\u00e1lni t\u00e1mad\u00e1sokhoz, \u00f6nk\u00e9nyes k\u00f3d v\u00e9grehajt\u00e1s\u00e1hoz a rendszerben (p\u00e9ld\u00e1ul parancsok hozz\u00e1ad\u00e1s\u00e1val a ~\\\/bashrc vagy ~\\\/profile f\u00e1jlokhoz).<\/p>\n

A probl\u00e9ma \u00e9rinti kiad\u00e1sok<\/a><\/noindex> 9.50-t\u0151l 9.52-ig (hiba m\u00e1r 2016 \u00f3ta jelen van (lehet, hogy a probl\u00e9ma kihaszn\u00e1l\u00e1s\u00e1nak felt\u00e9telei csak egyes m\u00e1s nemr\u00e9giben t\u00f6rt\u00e9nt v\u00e1ltoz\u00e1sok ut\u00e1n jelentkeztek).<\/a><\/noindex> a 9.28rc1 kiad\u00e1s \u00f3ta, de, adatok<\/a><\/noindex> a s\u00e9r\u00fcl\u00e9kenys\u00e9get felfedez\u0151 kutat\u00f3k \u00e1ltal meg\u00e1llap\u00edtottak, 9.50-t\u0151l jelentkezik).<\/p>\n

A jav\u00edt\u00e1st a kiad\u00e1sban javasolj\u00e1k 9.52.1<\/a><\/noindex> (k\u00f3dra ford\u00edt.<\/a><\/noindex>). A hibajav\u00edt\u00f3 csomagok friss\u00edt\u00e9sei m\u00e1r ki lettek adva a Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, SUSE<\/a><\/noindex>. A csomagok a RHEL<\/a><\/noindex> probl\u00e9m\u00e1k nem \u00e9rintettek.<\/p>\n

Eml\u00e9keztet\u00fcnk, hogy a Ghostscriptben tal\u00e1lhat\u00f3 s\u00e9r\u00fcl\u00e9kenys\u00e9gek fokozott vesz\u00e9lyt jelentenek, mivel ezt a csomagot sz\u00e1mos n\u00e9pszer\u0171 alkalmaz\u00e1s haszn\u00e1lja PostScript \u00e9s PDF form\u00e1tumok feldolgoz\u00e1s\u00e1ra. P\u00e9ld\u00e1ul a Ghostscriptet h\u00edvj\u00e1k meg az asztalon l\u00e9v\u0151 miniat\u0171r\u00f6k l\u00e9trehoz\u00e1sakor, az adatok h\u00e1tt\u00e9rbeli indexel\u00e9se sor\u00e1n \u00e9s a k\u00e9pek konvert\u00e1l\u00e1sakor. Sikeres t\u00e1mad\u00e1shoz sok esetben elegend\u0151 egy kifinomult f\u00e1jl felt\u00f6lt\u00e9se vagy a Nautilusban val\u00f3 megtekint\u00e9se. A Ghostscript s\u00e9r\u00fcl\u00e9kenys\u00e9gei k\u00e9pfeldolgoz\u00f3kon kereszt\u00fcl is kihaszn\u00e1lhat\u00f3k az ImageMagick \u00e9s GraphicsMagick csomagok eset\u00e9ben, hogy JPEG vagy PNG f\u00e1jlt adjunk \u00e1t, amelyben a k\u00e9p helyett PostScript k\u00f3d tal\u00e1lhat\u00f3 (ez a f\u00e1jl a Ghostscriptben ker\u00fcl feldolgoz\u00e1sra, mivel a MIME-t\u00edpus a tartalom alapj\u00e1n van azonos\u00edtva, nem pedig a kiterjeszt\u00e9sre t\u00e1maszkodva).<\/p>\n

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

Forr\u00e1s: 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, 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