{"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\/pl\/blog\/news\/uyazvimost-v-ghostscript-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-postscript-dokumenta","title":{"rendered":"Vulnerabilno\u015b\u0107 w Ghostscript, kt\u00f3ra pozwala na wykonanie kodu podczas otwierania dokumentu PostScript","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

W Ghostscript, zestawie narz\u0119dzi do przetwarzania, konwersji i generowania dokument\u00f3w w formatach PostScript i PDF, wykryto<\/a><\/noindex> vulnerabilno\u015b\u0107 (CVE-2020-15900<\/a><\/noindex>), co mo\u017ce prowadzi\u0107 do zmiany plik\u00f3w i wykonania dowolnych polece\u0144 przy otwieraniu specjalnie przygotowanych dokument\u00f3w w formacie PostScript. U\u017cycie niestandardowego operatora PostScript w dokumencie rsearch<\/a><\/noindex> pozwala na wywo\u0142anie przepe\u0142nienia typu uint32_t podczas obliczania rozmiaru, nadpisanie obszar\u00f3w pami\u0119ci poza przydzielonym buforem i uzyskanie dost\u0119pu do plik\u00f3w w systemie plik\u00f3w, co mo\u017cna wykorzysta\u0107 do przeprowadzenia ataku maj\u0105cego na celu wykonanie dowolnego kodu w systemie (na przyk\u0142ad poprzez dodanie polece\u0144 do ~\\\/bashrc lub ~\\\/profile).<\/p>\n

Problem dotyczy wyda\u0144<\/a><\/noindex> od 9.50 do 9.52 (b\u0142\u0105d jest obecny<\/a><\/noindex> od wydania 9.28rc1, ale jak danych<\/a><\/noindex> stwierdzili badacze wykrywaj\u0105cy luk\u0119, ujawnia si\u0119 od wersji 9.50).<\/p>\n

Poprawka zosta\u0142a zaproponowana w wydaniu 9.52.1<\/a><\/noindex> (\u0142atk\u0119<\/a><\/noindex>). Aktualizacje pakiet\u00f3w z poprawk\u0105 ju\u017c zosta\u0142y wydane dla Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, SUSE<\/a><\/noindex>. Pakiety w RHEL<\/a><\/noindex> nie s\u0105 podatne na problem.<\/p>\n

Przypomnijmy, \u017ce luki w Ghostscript stanowi\u0105 podwy\u017cszone zagro\u017cenie, poniewa\u017c ten pakiet jest u\u017cywany w wielu popularnych aplikacjach do przetwarzania format\u00f3w PostScript i PDF. Na przyk\u0142ad, Ghostscript jest wywo\u0142ywany podczas tworzenia miniatur na pulpicie, podczas indeksacji danych w tle i przy konwersji obraz\u00f3w. W wielu przypadkach, aby skutecznie przeprowadzi\u0107 atak, wystarczy po prostu za\u0142adowa\u0107 plik z exploitem lub przegl\u0105da\u0107 katalog z nim w Nautilusie. Luki w Ghostscript mog\u0105 by\u0107 tak\u017ce wykorzystywane przez narz\u0119dzia do obs\u0142ugi obraz\u00f3w oparte na pakietach ImageMagick i GraphicsMagick, przekazuj\u0105c im plik JPEG lub PNG, w kt\u00f3rym zamiast obrazu znajduje si\u0119 kod PostScript (taki plik zostanie przetworzony przez Ghostscript, poniewa\u017c typ MIME jest rozpoznawany na podstawie zawarto\u015bci, a nie na podstawie rozszerzenia).<\/p>\n

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

\u0179r\u00f3d\u0142o: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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