{"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\/sl\/blog\/news\/uyazvimost-v-ghostscript-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-postscript-dokumenta","title":{"rendered":"Ranljivost v Ghostscript, ki omogo\u010da izvajanje kode ob odpiranju dokumenta PostScript","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V Ghostscript, orodju za obdelavo, pretvorbo in generiranje dokumentov v formatih PostScript in PDF, odkrita<\/a><\/noindex> ranljivost (CVE-2020-15900<\/a><\/noindex>), ki lahko privede do spremembe datotek in izvajanja poljubnih ukazov ob odpiranju posebej oblikovanih dokumentov v formatu PostScript. Uporaba nestandardnega PostScript operatorja rsearch<\/a><\/noindex> omogo\u010da prelivanje tipa uint32_t pri izra\u010dunu velikosti, ponovno pisanje pomnilni\u0161kih obmo\u010dij zunaj dodeljenega medpomnilnika in dostop do datotek v FS, kar se lahko uporabi za organizacijo napada za izvajanje poljubne kode v sistemu (na primer z dodajanjem ukazov v ~\/ .bashrc ali ~\/ .profile).<\/p>\n

Te\u017eava zadeva izdaje<\/a><\/noindex> od 9.50 do 9.52 (napaka je na voljo<\/a><\/noindex> od izdaje 9.28rc1, vendar se podatkov<\/a><\/noindex> po raziskovalcih, ki so odkrili ranljivost, ka\u017ee od razli\u010dice 9.50).<\/p>\n

Popravilo je bilo predlagano v izdaji 9.52.1<\/a><\/noindex> (zakrpu<\/a><\/noindex>). Posodobitve paketov s popravkom so \u017ee bile izdane za Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, SUSE<\/a><\/noindex>. Paketi v RHEL<\/a><\/noindex> te\u017eave niso dovzetni.<\/p>\n

Spomnimo, da ranljivosti v Ghostscript predstavljajo pove\u010dano tveganje, ker se to orodje uporablja v mnogih priljubljenih aplikacijah za obdelavo formatov PostScript in PDF. Na primer, Ghostscript se uporablja pri ustvarjanju miniatur na namizju, pri ozadnji indeksaciji podatkov in pri pretvorbi slik. Za uspe\u0161en napad je v mnogih primerih dovolj, da preprosto nalo\u017eite datoteko z izkori\u0161\u010danjem ali si ogledate imenik z njo v Nautilusu. Ranljivosti v Ghostscript lahko tudi izkori\u0161\u010date preko obdelovalnikov slik, ki temeljijo na paketih ImageMagick in GraphicsMagick, tako da jim posredujete JPEG ali PNG datoteko, v kateri namesto slike le\u017ei koda PostScript (ta datoteka bo obdelana v Ghostscript, ker MIME tip prepozna po vsebini in se ne zana\u0161a na kon\u010dnico).<\/p>\n

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

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

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