{"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\/it\/blog\/news\/uyazvimost-v-libreoffice-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-vredonosnyh-dokumentov","title":{"rendered":"Vulnerabilit\u00e0 in LibreOffice che consente di eseguire codice aprendo documenti dannosi.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Nel pacchetto per ufficio LibreOffice identificata<\/a><\/noindex> vulnerabilit\u00e0 (CVE-2019-9848<\/a><\/noindex>), che pu\u00f2 essere utilizzata per eseguire codice arbitrario all'apertura di documenti preparati da un aggressore. <\/p>\n

La vulnerabilit\u00e0 \u00e8 causata dal fatto che il componente LibreLogo, progettato per l'insegnamento della programmazione e l'inserimento di disegni vettoriali, traduce le proprie operazioni in codice Python. Avendo la possibilit\u00e0 di eseguire istruzioni LibreLogo, un attaccante pu\u00f2 ottenere l'esecuzione di qualsiasi codice Python nel contesto della sessione utente corrente, sfruttando il comando «run» fornito in LibreLogo. Da Python, tramite la funzione system(), \u00e8 possibile a sua volta invocare comandi di sistema arbitrari.<\/p>\n

LibreLogo \u00e8 un componente facoltativo, ma in LibreOffice vengono proposte di default macro che consentono di invocare LibreLogo e non richiedono conferma per l'esecuzione dell'operazione, n\u00e9 mostrano avvisi, anche quando \u00e8 attivata la modalit\u00e0 di massima protezione per le macro (selezione del livello «Very High»).
\nPer attaccare, \u00e8 possibile associare tale macro a un gestore di eventi che si attiva, ad esempio, al passaggio del cursore del mouse su un'area specifica o all'attivazione del focus di input nel documento (evento onFocus). Di conseguenza, all'apertura di un documento preparato dall'aggressore, si pu\u00f2 ottenere l'esecuzione nascosta di codice Python, senza che l'utente se ne accorga. Per esempio, nell'esempio dell'exploit dimostrato, all'apertura del documento si avvia senza preavviso la calcolatrice di sistema.
\n

\"Vulnerabilit\u00e0<\/center><\/p>\n

La vulnerabilit\u00e0 \u00e8 stata rimossa senza troppo clamore nell'aggiornamento di LibreOffice 6.2.5, rilasciato il 1 luglio, ma si \u00e8 scoperto che il problema non era stato completamente risolto (\u00e8 stato bloccato solo l'invocazione di LibreLogo dalle macro) e alcuni altri vettori di attacco rimangono non corretti.<\/a><\/noindex> Inoltre, il problema non \u00e8 risolto nella versione 6.1.6, raccomandata per gli utenti aziendali. La vulnerabilit\u00e0 dovrebbe essere completamente eliminata nella versione LibreOffice 6.3, attesa per la prossima settimana. Fino al rilascio dell'aggiornamento completo, si consiglia agli utenti di disattivare esplicitamente il componente LibreLogo, che \u00e8 disponibile per impostazione predefinita in molte forniture. La vulnerabilit\u00e0 \u00e8 stata parzialmente risolta in 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":"

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