{"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\/da\/blog\/news\/uyazvimost-v-ghostscript-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-postscript-dokumenta","title":{"rendered":"S\u00e5rbarhed i Ghostscript, der tillader udf\u00f8relse af kode ved \u00e5bning af et PostScript-dokument","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I Ghostscript, et s\u00e6t af v\u00e6rkt\u00f8jer til behandling, konvertering og generering af dokumenter i formaterne PostScript og PDF, opdaget<\/a><\/noindex> s\u00e5rbarhed (CVE-2020-15900<\/a><\/noindex>), som kan f\u00f8re til \u00e6ndringer af filer og udf\u00f8relse af vilk\u00e5rlige kommandoer, n\u00e5r der \u00e5bnes specielt udformede dokumenter i PostScript-format. Brug af non-standard PostScript-operatorer i dokumentet rsearch<\/a><\/noindex> muligg\u00f8r en uint32_t buffer overflow ved beregning af st\u00f8rrelsen, overskriver hukommelsesomr\u00e5der uden for den tildelte buffer og giver adgang til filer i filsystemet, hvilket kan bruges til at gennemf\u00f8re et angreb for at udf\u00f8re vilk\u00e5rlig kode p\u00e5 systemet (for eksempel ved at tilf\u00f8je kommandoer til ~\\\/\\.bashrc eller ~\\\/\\.profile).<\/p>\n

Problemet ber\u00f8rer udgivelser<\/a><\/noindex> fra 9.50 til 9.52 (fejl til stede<\/a><\/noindex> som begyndte med udgivelsen 9.28rc1, men if\u00f8lge data<\/a><\/noindex> de forskere, der har identificeret s\u00e5rbarheden, viser sig fra version 9.50).<\/p>\n

En l\u00f8sning er foresl\u00e5et i udgivelsen 9.52.1<\/a><\/noindex> (patch<\/a><\/noindex>). Opdateringer af pakker med rettelser er allerede udgivet til Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, SUSE<\/a><\/noindex>. Pakker i RHEL<\/a><\/noindex> er ikke p\u00e5virket af problemet.<\/p>\n

Det er vigtigt at bem\u00e6rke, at s\u00e5rbarhederne i Ghostscript udg\u00f8r en betydelig risiko, da denne pakke anvendes i mange popul\u00e6re applikationer til behandling af PostScript- og PDF-formater. For eksempel kaldes Ghostscript i processen med at oprette miniaturebilleder p\u00e5 skrivebordet, ved baggrundsindeksering af data og ved konvertering af billeder. I mange tilf\u00e6lde er det tilstr\u00e6kkeligt blot at uploade en fil med et exploit eller se kataloget indeholdende det i Nautilus for at lykkes med et angreb. S\u00e5rbarhederne i Ghostscript kan ogs\u00e5 udnyttes gennem billedbehandlere baseret p\u00e5 ImageMagick og GraphicsMagick-pakkerne ved at overf\u00f8re en JPEG- eller PNG-fil, hvor PostScript-kode er gemt i stedet for et billede (s\u00e5danne filer behandles i Ghostscript, da MIME-typen genkendes ud fra indholdet og ikke afh\u00e6nger af filtypen).<\/p>\n

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

Kilde: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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