{"id":36775,"date":"2019-10-31T22:13:44","date_gmt":"2019-10-31T19:13:44","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-v-libreoffice-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-vredonosnyh-dokumentov\/"},"modified":"2019-10-31T22:13:44","modified_gmt":"2019-10-31T19:13:44","slug":"uyazvimost-v-libreoffice-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-vredonosnyh-dokumentov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/uyazvimost-v-libreoffice-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-vredonosnyh-dokumentov","title":{"rendered":"Vulnerabilidade no LibreOffice que permite executar c\u00f3digo ao abrir documentos maliciosos","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

No pacote de escrit\u00f3rio LibreOffice foi identificada<\/a><\/noindex> vulnerabilidade (CVE-2019-9848<\/a><\/noindex>), que pode ser usada para executar c\u00f3digo arbitr\u00e1rio ao abrir documentos preparados por um invasor. <\/p>\n

A vulnerabilidade \u00e9 causada pelo fato de que o componente LibreLogo, destinado ao ensino de programa\u00e7\u00e3o e \u00e0 inser\u00e7\u00e3o de gr\u00e1ficos vetoriais, traduz suas opera\u00e7\u00f5es em c\u00f3digo na linguagem Python. Com a capacidade de executar instru\u00e7\u00f5es do LibreLogo, um invasor pode conseguir a execu\u00e7\u00e3o de qualquer c\u00f3digo em Python no contexto da sess\u00e3o atual do usu\u00e1rio, aproveitando o comando \"run\" fornecido pelo LibreLogo. A partir do Python, utilizando a fun\u00e7\u00e3o system(), \u00e9 poss\u00edvel, por sua vez, chamar comandos do sistema arbitr\u00e1rios.<\/p>\n

O LibreLogo \u00e9 um componente opcional, mas no LibreOffice, macros s\u00e3o oferecidas por padr\u00e3o, permitindo chamar o LibreLogo e n\u00e3o exigindo confirma\u00e7\u00e3o para a execu\u00e7\u00e3o da opera\u00e7\u00e3o, al\u00e9m de n\u00e3o exibirem avisos, mesmo quando o modo de m\u00e1xima prote\u00e7\u00e3o de macros est\u00e1 ativado (selecionando o n\u00edvel \"Very High\").
\nPara o ataque, \u00e9 poss\u00edvel vincular essa macro a um manipulador de eventos, que \u00e9 acionado, por exemplo, ao passar o cursor do mouse por uma determinada \u00e1rea ou ao ativar o foco de entrada no documento (evento onFocus). Como resultado, ao abrir o documento preparado pelo invasor, pode-se conseguir a execu\u00e7\u00e3o oculta do c\u00f3digo Python, sem que o usu\u00e1rio perceba. Por exemplo, no exemplo do exploit demonstrado, ao abrir o documento, o calculador do sistema \u00e9 iniciado sem qualquer aviso.
\n

\"Vulnerabilidade<\/center><\/p>\n

A vulnerabilidade foi corrigida sem muito alarde na atualiza\u00e7\u00e3o do LibreOffice 6.2.5, lan\u00e7ada em 1\u00ba de julho, mas a quest\u00e3o, como se verificou, n\u00e3o foi completamente resolvida (apenas a chamada do LibreLogo a partir de macros foi bloqueada) e ficam sem corre\u00e7\u00e3o<\/a><\/noindex> alguns outros vetores para conduzir o ataque. Al\u00e9m disso, o problema n\u00e3o foi resolvido na vers\u00e3o 6.1.6, recomendada para usu\u00e1rios corporativos. A corre\u00e7\u00e3o completa da vulnerabilidade est\u00e1 prevista para a vers\u00e3o LibreOffice 6.3, que deve ser lan\u00e7ada na pr\u00f3xima semana. At\u00e9 o lan\u00e7amento da atualiza\u00e7\u00e3o completa, os usu\u00e1rios s\u00e3o aconselhados a desativar explicitamente o componente LibreLogo, que por padr\u00e3o est\u00e1 dispon\u00edvel em muitas distribui\u00e7\u00f5es. A vulnerabilidade foi parcialmente corrigida em Debian<\/a><\/noindex>, Fedora<\/a><\/noindex>, SUSE\/openSUSE<\/a><\/noindex> e Ubuntu<\/a><\/noindex>.<\/p>\n

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

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

\u0412 \u043e\u0444\u0438\u0441\u043d\u043e\u043c \u043f\u0430\u043a\u0435\u0442\u0435 LibreOffice \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2019-9848), \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u043e\u0433\u043e \u043a\u043e\u0434\u0430 \u043f\u0440\u0438 \u043e\u0442\u043a\u0440\u044b\u0442\u0438\u0438 \u0434\u043e\u043a\u0443\u043c\u0435\u043d\u0442\u043e\u0432, \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u043e\u043c. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0442\u0435\u043c, \u0447\u0442\u043e \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442 LibreLogo, \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u044b\u0439 \u0434\u043b\u044f \u043e\u0431\u0443\u0447\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044e \u0438 \u0432\u0441\u0442\u0430\u0432\u043a\u0438 \u0432\u0435\u043a\u0442\u043e\u0440\u043d\u044b\u0445 \u0440\u0438\u0441\u0443\u043d\u043a\u043e\u0432, \u0442\u0440\u0430\u043d\u0441\u043b\u0438\u0440\u0443\u0435\u0442 \u0441\u0432\u043e\u0438 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 \u0432 \u043a\u043e\u0434 \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Python. \u0418\u043c\u0435\u044f \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0438\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0438 LibreLogo \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a \u043c\u043e\u0436\u0435\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043b\u044e\u0431\u043e\u0433\u043e \u043a\u043e\u0434\u0430 \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Python […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":27546,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-36775","post","type-post","status-publish","format-standard","has-post-thumbnail","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\udd47Vulnerabilidade no LibreOffice que permite a execu\u00e7\u00e3o de 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