{"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\/pt\/blog\/news\/uyazvimost-v-ghostscript-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-postscript-dokumenta","title":{"rendered":"Vulnerabilidade no Ghostscript que permite a execu\u00e7\u00e3o de c\u00f3digo ao abrir um documento PostScript","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

No Ghostscript, um conjunto de ferramentas para processar, converter e gerar documentos nos formatos PostScript e PDF, foi identificada<\/a><\/noindex> vulnerabilidade (CVE-2020-15900<\/a><\/noindex>), que pode levar \u00e0 modifica\u00e7\u00e3o de arquivos e \u00e0 execu\u00e7\u00e3o de comandos arbitr\u00e1rios ao abrir documentos PostScript especialmente formatados. O uso de um operador PostScript n\u00e3o padr\u00e3o no documento rsearch<\/a><\/noindex> permite causar um estouro do tipo uint32_t ao calcular o tamanho, sobrescrever \u00e1reas de mem\u00f3ria fora do buffer alocado e acessar arquivos no sistema de arquivos, o que pode ser explorado para realizar um ataque que execute c\u00f3digo arbitr\u00e1rio no sistema (por exemplo, atrav\u00e9s da adi\u00e7\u00e3o de comandos em ~\/.bashrc ou ~\/.profile).<\/p>\n

O problema afeta lan\u00e7amentos<\/a><\/noindex> de 9.50 a 9.52 (erro est\u00e3o presentes<\/a><\/noindex> come\u00e7ando com o lan\u00e7amento 9.28rc1, mas, segundo dados<\/a><\/noindex> pesquisadores que descobriram a vulnerabilidade, manifesta-se a partir da vers\u00e3o 9.50).<\/p>\n

A corre\u00e7\u00e3o foi proposta na vers\u00e3o 9.52.1<\/a><\/noindex> (patch<\/a><\/noindex>). Atualiza\u00e7\u00f5es de pacotes com a corre\u00e7\u00e3o j\u00e1 foram lan\u00e7adas para Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, SUSE<\/a><\/noindex>. Pacotes em RHEL<\/a><\/noindex> n\u00e3o s\u00e3o afetados pelo problema.<\/p>\n

Vale lembrar que as vulnerabilidades no Ghostscript representam um perigo elevado, uma vez que este pacote \u00e9 utilizado em muitos aplicativos populares para processar formatos PostScript e PDF. Por exemplo, o Ghostscript \u00e9 chamado no processo de cria\u00e7\u00e3o de miniaturas na \u00e1rea de trabalho, durante a indexa\u00e7\u00e3o de dados em segundo plano e na convers\u00e3o de imagens. Para um ataque bem-sucedido, em muitos casos, \u00e9 suficiente apenas fazer o download de um arquivo com um exploit ou visualizar um diret\u00f3rio que o cont\u00e9m no Nautilus. Vulnerabilidades no Ghostscript tamb\u00e9m podem ser exploradas atrav\u00e9s de manipuladores de imagem baseados em pacotes como ImageMagick e GraphicsMagick, passando para eles um arquivo JPEG ou PNG, onde em vez de uma imagem h\u00e1 c\u00f3digo PostScript (esse arquivo ser\u00e1 processado no Ghostscript, pois o tipo MIME \u00e9 reconhecido pelo conte\u00fado, e n\u00e3o baseado na extens\u00e3o).<\/p>\n

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

Fonte: 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 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