{"id":101354,"date":"2021-09-21T10:22:45","date_gmt":"2021-09-21T08:22:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-openoffice-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-fajla"},"modified":"2021-09-21T10:22:45","modified_gmt":"2021-09-21T08:22:45","slug":"uyazvimost-v-openoffice-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-fajla","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/uyazvimost-v-openoffice-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-fajla","title":{"rendered":"Luka w OpenOffice, kt\u00f3ra umo\u017cliwia wykonanie kodu przy otwieraniu pliku.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

W pakiecie biurowym Apache OpenOffice wykryto luk\u0119 (CVE-2021-33035), kt\u00f3ra pozwala na wykonanie kodu przy otwieraniu specjalnie przygotowanego pliku w formacie DBF. Badacz, kt\u00f3ry ujawni\u0142 problem, ostrzeg\u0142 przed stworzeniem dzia\u0142aj\u0105cego exploit-a dla platformy Windows. Poprawka luki jest na razie dost\u0119pna tylko w formie \u0142atki w repozytorium projektu, kt\u00f3re znalaz\u0142o si\u0119 w sk\u0142adzie testowych kompilacji OpenOffice 4.1.11. Aktualizacje dla stabilnej ga\u0142\u0119zi jeszcze nie zosta\u0142y wydane. <\/p>\n

Problem wynika z faktu, \u017ce podczas alokacji pami\u0119ci OpenOffice polega\u0142 na warto\u015bciach fieldLength i fieldType w nag\u0142\u00f3wkach plik\u00f3w DBF, nie sprawdzaj\u0105c przy tym zgodno\u015bci rzeczywistego typu danych w polach. Aby przeprowadzi\u0107 atak, mo\u017cna wskaza\u0107 w warto\u015bci fieldType typ INTEGER, ale umie\u015bci\u0107 dane o wi\u0119kszym rozmiarze i ustawi\u0107 warto\u015b\u0107 fieldLength niezgodn\u0105 z rozmiarem danych o typie INTEGER, co spowoduje, \u017ce ogon danych z pola zostanie zapisany poza przydzielonym buforem. W wyniku kontrolowanego przepe\u0142nienia bufora badaczowi uda\u0142o si\u0119 nadpisa\u0107 wska\u017anik zwrotu z funkcji i przy pomocy technik programowania zorientowanego na zwrot (ROP - Return-Oriented Programming) osi\u0105gn\u0105\u0107 wykonanie swojego kodu. <\/p>\n

Podczas u\u017cywania techniki ROP atakuj\u0105cy nie stara si\u0119 umie\u015bci\u0107 swojego kodu w pami\u0119ci, a operuje ju\u017c istniej\u0105cymi w za\u0142adowanych bibliotekach fragmentami instrukcji maszynowych, ko\u0144cz\u0105cymi si\u0119 instrukcj\u0105 zwrotu (zazwyczaj s\u0105 to ko\u0144c\u00f3wki funkcji bibliotekowych). Dzia\u0142anie exploita sprowadza si\u0119 do budowania \u0142a\u0144cucha wywo\u0142a\u0144 podobnych blok\u00f3w (\u201egadget\u00f3w\u201d) w celu uzyskania po\u017c\u0105danej funkcjonalno\u015bci. W przypadku exploita dla OpenOffice wykorzystano kod z biblioteki libxml2 u\u017cywanej w OpenOffice, kt\u00f3ra w przeciwie\u0144stwie do samego OpenOffice zosta\u0142a skompilowana bez mechanizm\u00f3w ochrony DEP (Data Execution Prevention) i ASLR (Address Space Layout Randomization). <\/p>\n

Deweloperzy OpenOffice zostali poinformowani o problemie 4 maja, po czym publiczne ujawnienie informacji o podatno\u015bci wyznaczono na 30 sierpnia. Poniewa\u017c do wyznaczonego terminu aktualizacja stabilnej ga\u0142\u0119zi nie zosta\u0142a zrealizowana, badacz przeni\u00f3s\u0142 ujawnienie szczeg\u00f3\u0142\u00f3w na 18 wrze\u015bnia, ale deweloperzy OpenOffice nie zd\u0105\u017cyli przygotowa\u0107 wydania 4.1.11 do tego terminu. Warto zauwa\u017cy\u0107, \u017ce podczas tego samego badania odkryto podobn\u0105 podatno\u015b\u0107 w kodzie obs\u0142ugi formatu DBF w Microsoft Office Access (CVE-2021\u201338646), szczeg\u00f3\u0142y kt\u00f3rej zostan\u0105 ujawnione p\u00f3\u017aniej. W LibreOffice nie znaleziono problem\u00f3w.
\n
\u0179r\u00f3d\u0142o: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u043e\u0439 \u0432\u0435\u0442\u043a\u0438 \u043f\u043e\u043a\u0430 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-101354","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\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\n","aioseo_head_json":{"title":"\ud83e\udd47Podatno\u015b\u0107 w OpenOffice, umo\u017cliwiaj\u0105ca wykonanie kodu po otwarciu pliku | ProHoster","description":"W pakiecie biurowym Apache OpenOffice zidentyfikowano podatno\u015b\u0107 (CVE-2021-33035), kt\u00f3ra umo\u017cliwia wykonanie kodu po otwarciu specjalnie przygotowanego pliku w formacie 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