{"id":119956,"date":"2024-09-27T09:43:04","date_gmt":"2024-09-27T07:43:04","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/udalyonno-ekspluatiruemye-uyazvimosti-v-servere-pechati-cups"},"modified":"2024-09-27T09:43:04","modified_gmt":"2024-09-27T07:43:04","slug":"udalyonno-ekspluatiruemye-uyazvimosti-v-servere-pechati-cups","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/udalyonno-ekspluatiruemye-uyazvimosti-v-servere-pechati-cups","title":{"rendered":"Kaugjuhtimise haavatavused CUPS-i printimisteenuses","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Simone Margaritelli, OpenSnitch'i ja bettercap'i autor, avaldas ennetavalt teavet eelnevalt kuulutatud kriitiliste haavatavuste kohta, mis v\u00f5imaldavad kaugelt r\u00fcnnata GNU\/Linuxi, Solaris, FreeBSD ja mitmeid teisi BSD-s\u00fcsteeme. Algne avaldamise kuup\u00e4ev oli 6. oktoober, kuid teabe lekke t\u00f5ttu tuli see avaldada enne t\u00e4htaega, enne kui enamik jaotusi suudab pakettide uuendamise ette valmistada. Haavatavused m\u00f5jutavad CUPS-i printimisteenust ja v\u00f5imaldavad kaugelt, ilma autentimiseta, saavutada koodi t\u00e4itmine s\u00fcsteemis.    <\/p>\n<p>Probleemide avastamisega tegelev teadlane on valmistanud t\u00f6\u00f6n\u00e4itlikkuse, mis kasutab mitme haavatavuse kombinatsiooni ja v\u00f5imaldab kaugliselt k\u00e4ivitada koodi toimetamise protsessis printimise CUPS \u00f5iguste all (see on tavaliselt kasutaja \u00ablp\u00bb). N\u00e4itlikkus v\u00f5imaldab m\u00e4rkamatult muuta kasutaja printeri parameetreid v\u00f5i lisada uue printeri, mis on seotud k\u00e4imasoleva r\u00fcndava IPP-serveriga, mis annab v\u00e4lja spetsiaalselt vormistatud PPD-printeri kirjelduse. Selle PPD t\u00f6\u00f6tlemine printimise \u00fclesande k\u00e4ivitamisel viib r\u00fcndava koodi k\u00e4ivitamiseni (on vajalik, et ohver algataks printimise vale v\u00f5i r\u00fcndaja asendatud printerile).        <\/p>\n<p>R\u00fcnnakule on haavatavad s\u00fcsteemid, <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/server\/dts-prohoster\/\"   title=\"serverilt\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3090\">serverilt<\/a> kus t\u00f6\u00f6tab CUPS-i printimisteenus ja k\u00e4ivitatud protsess cups-browsed, mis aktsepteerib v\u00f5rgu\u00fchendusi 631 pordil (UDP). R\u00fcnnakut on v\u00f5imalik teostada ka kohalikus v\u00f5rgus, kus ligip\u00e4\u00e4suks kasutatakse <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/server\/dts-shicago\/\"   title=\"serveri\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2943\">serveri<\/a> Printimisel kasutatakse protokolle zeroconf, mDNS v\u00f5i DNS-SD. Haavatavad on ainult cups-browsed konfiguratsioonid, kus failis \/etc\/cups\/cups-browsed.conf parameetris BrowseRemoteProtocols on v\u00e4\u00e4rtus \u00abcups\u00bb. Distributsioonides, kus on systemd, saab cups-browsed teenuse kasutamist kontrollida k\u00e4suga \u00absudo systemctl status cups-browsed\u00bb.          <\/p>\n<p>Haavatavus esineb k\u00f5ikides CUPS-p\u00f5histes printimiss\u00fcsteemides, kus kasutatakse haavatavaid versioone pakettidest cups-filters, libcupsfilters, libppd ja cups-browsed. Parandused on seni saadaval ainult plaastrite kujul (1, 2, 3) \u2014 praegused versioonid cups-filters 2.0.1, libcupsfilters 2.1b1, libppd 2.1b1 ja cups-browsed 2.0.1 on haavatavad. Distributsioonides on probleem j\u00e4\u00e4nud lahendamata, uuenduste ilmumise j\u00e4lgimiseks saab k\u00fclastada j\u00e4rgmisi lehti: Debian, Ubuntu, RHEL, SUSE\/openSUSE, Fedora, Arch, FreeBSD. Kaitseks enne uuenduse installimist v\u00f5ib v\u00e4listele v\u00f5rkudele sulgeda UDP-pordi 631, keelata cups-browsed teenuse v\u00f5i seadistada BrowseRemoteProtocols v\u00e4\u00e4rtuseks \u00abnone\u00bb.      <\/p>\n<p>Tuletatud haavatavused:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2024-47176 \u2014 haavatavus cups-browsed protsessis, mis loob v\u00f5rgu sokli, mis v\u00f5tab \u00fchendusi vastu 631 pordil, \u00fchendudes k\u00f5igi s\u00fcsteemis olevate v\u00f5rgu liideste k\u00fclge ja v\u00f5tab vastu IPP-p\u00e4ringud \u00abGet-Printer-Attributes\u00bb mis tahes v\u00e4listelt s\u00fcsteemidelt. Selle teenuse manipuleerimise kaudu on v\u00f5imalik lisada s\u00fcsteemi r\u00fcndaja kontrollitud printer ja kasutada haavatavust CUPS-i teiste komponentide PPD-konfiguratsiooni edastamise kaudu.\n<li class=\"l\"> CVE-2024-47177 \u2014 haavatavus foomatic-rip t\u00f6\u00f6tlejas, mis kuulub cups-filters komplekti, v\u00f5imaldades koodi k\u00e4ivitamist, kui FoomaticRIPCommandLine parameeter edastatakse PPD-failis, mille r\u00fcndaja suudab toimetada varem mainitud haavatavuse t\u00f5ttu cups-browsed. FoomaticRIPCommandLine parameetris esitatud shell-k\u00e4sklusi t\u00e4idetakse nagu on, arvestamata, et selle parameetri v\u00f5ib m\u00e4\u00e4rata keegi muu. N\u00e4iteks failisse \/tmp\/VULNERABLE kirjutamiseks saab m\u00e4\u00e4rata \"FoomaticRIPCommandLine: \"echo 1 &gt; \/tmp\/VULNERABLE\".\n<li class=\"l\"> CVE-2024-47175 \u2014 haavatavus libppd-s, mis tuleneb ppdCreatePPDFromIPP2 parameetri kehtivuse kontrollimise puudumisest IPP-aatribuutide kirjutamisel ajutisse PPD-faili. Probleem v\u00f5imaldab m\u00e4\u00e4rata suvalisi andmeid l\u00f5puks PPD-failis, kasutades rea vahetusm\u00e4rki. N\u00e4iteks on v\u00f5imalik kontroll \u00fcletada ja koos lubatud atribuutidega lisada FoomaticRIPCommandLine atribuut, et \u00e4ra kasutada varem mainitud haavatavust cups-filtersis.\n<li class=\"l\"> CVE-2024-47076 \u2014 haavatavus libcupsfilters teegis cups-filters pakis, mis on seotud cfGetPrinterAttributes5 v\u00e4\u00e4rtuste kontrollimise puudumisega, mille tagastab v\u00e4line IPP-server, andes r\u00fcndajale v\u00f5imaluse korraldada suvaliste IPP-atribuutide t\u00f6\u00f6tlemine CUPS-i muudes alams\u00fcsteemides, n\u00e4iteks PPD-failide genereerimisel.      <\/ul>\n<p>CUPSi r\u00fcnde stsenaarium h\u00f5lmab j\u00e4rgmisi samme:    <\/p>\n<ul>\n<li class=\"l\"> R\u00fcndaja k\u00e4ivitab oma IPP-serveri.\n<li class=\"l\"> Saadab ohvrile UDP-paketi, mis sisaldab linki printerile, mis on seotud r\u00fcndaja k\u00e4ivitatud IPP-serveriga.\n<li class=\"l\"> P\u00e4rast selle paketi vastuv\u00f5tmist \u00fchendab ohvri s\u00fcsteem r\u00fcndaja IPP-serveriga ja k\u00fcsib printeri atribuute.\n<li class=\"l\"> R\u00fcndaja IPP-server tagastab ohvri p\u00e4ringule PPD-faili koos atribuutidega, mille seas on FoomaticRIPCommandLine atribuut. See atribuut kinnitatakse koos \u00fche lubatud atribuudiga, kasutades reas vahetusm\u00e4rki \u00ab\n\u00bb (n\u00e4iteks \u00abcupsPrivacyURI: \u00abhttps:\/\/www.google.com\/\n*FoomaticRIPCommandLine: \u00ab), mis v\u00f5imaldab kontrolli \u00fcle saada ja viib FoomaticRIPCommandLine salvestamiseni eraldi atribuudina ajutisse faili.\n<li class=\"l\"> Edukate parameetrite t\u00f6\u00f6tlemise tulemusena loodi ohvri s\u00fcsteemis PPD-fail: ... *cupsSNMPSupplies: False *cupsLanguages: \u00aben\u00bb *cupsPrivacyURI: \u00abhttps:\/\/www.google.com\/\u00bb *FoomaticRIPCommandLine: \u00abecho 1 &gt; \/tmp\/I_AM_VULNERABLE\u00bb *cupsFilter2: \u00abapplication\/pdf application\/vnd.cups-postscript 0 foomatic-rip\u00bb *cupsSingleFile: True *cupsFilter2: \u00abapplication\/vnd.cups-pdf application\/pdf 0 -\u00bb ...\n<li class=\"l\"> Kui r\u00fcndaja asendatud printerile prinditakse, k\u00e4ivitatakse ohvri s\u00fcsteemis k\u00e4sk \u00abecho 1 &gt; \/tmp\/I_AM_VULNERABLE\u00bb.   <\/ul>\n<p>          <center>  <video controls=\"\" style=\"width: 700px; height: 600px; max-width:100%\"><source src=\"https:\/\/www.evilsocket.net\/images\/2024\/cups1\/exploit.mp4\" type=\"video\/mp4\"><\/video>  <\/center>      <\/p>\n<p>Haavatavuste avastanud uurija m\u00e4rkis, et haavatavuse leidmiseks kulus tal paar p\u00e4eva, kuid seej\u00e4rel j\u00e4rgnes 22 p\u00e4eva kestev suhtlemine OpenPrinting projekti arendajatega, et veenda neid probleemi t\u00e4htsuses ja patchide ettevalmistamise vajaduses. Arutelu j\u00f5udis vaidlusesse, kas neid probleeme \u00fcldse parandada, ja olukorra suudeti p\u00f6\u00f6rata vaid selle kaudu, et teema suhtes t\u00f5statati avalik t\u00e4helepanu. Samuti on huvitav, et teabe lekkimisel, mille k\u00e4igus anti CERT-ile konfidentsiaalne raport ja eksploit, ilmusid need breachforums.st foorumisse avatud juurdep\u00e4\u00e4suga, hoolimata teabe avalikustamise embargost.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=61942\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u0438\u043c\u043e\u043d\u0435 \u041c\u0430\u0440\u0433\u0430\u0440\u0438\u0442\u0435\u043b\u043b\u0438 (Simone Margaritelli), \u0430\u0432\u0442\u043e\u0440 \u043c\u0435\u0436\u0441\u0435\u0442\u0435\u0432\u043e\u0433\u043e \u044d\u043a\u0440\u0430\u043d\u0430 OpenSnitch \u0438 \u0441\u0435\u0442\u0435\u0432\u043e\u0433\u043e \u0430\u043d\u0430\u043b\u0438\u0437\u0430\u0442\u043e\u0440\u0430 bettercap, \u0434\u043e\u0441\u0440\u043e\u0447\u043d\u043e \u0440\u0430\u0441\u043a\u0440\u044b\u043b \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u043e \u0440\u0430\u043d\u0435\u0435 \u0430\u043d\u043e\u043d\u0441\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u0430\u0442\u0430\u043a\u043e\u0432\u0430\u0442\u044c \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u044b GNU\/Linux, Solaris, FreeBSD \u0438 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0434\u0440\u0443\u0433\u0438\u0435 BSD-\u0441\u0438\u0441\u0442\u0435\u043c\u044b. \u0418\u0437\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u044f \u0431\u044b\u043b\u0430 \u0437\u0430\u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u043d\u0430 6 \u043e\u043a\u0442\u044f\u0431\u0440\u044f, \u043d\u043e \u0438\u0437-\u0437\u0430 \u0443\u0442\u0435\u0447\u043a\u0438 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043f\u0440\u0438\u0448\u043b\u043e\u0441\u044c \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u0442\u044c \u0434\u043e\u0441\u0440\u043e\u0447\u043d\u043e, \u0434\u043e \u0442\u043e\u0433\u043e \u043a\u0430\u043a \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u043e \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u043e\u0432 \u0443\u0441\u043f\u0435\u0435\u0442 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u0438\u0442\u044c \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u0430\u043a\u0435\u0442\u043e\u0432. [&hellip;]<\/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-119956","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0421\u0438\u043c\u043e\u043d\u0435 \u041c\u0430\u0440\u0433\u0430\u0440\u0438\u0442\u0435\u043b\u043b\u0438 (Simone Margaritelli), \u0430\u0432\u0442\u043e\u0440 \u043c\u0435\u0436\u0441\u0435\u0442\u0435\u0432\u043e\u0433\u043e \u044d\u043a\u0440\u0430\u043d\u0430 OpenSnitch \u0438 \u0441\u0435\u0442\u0435\u0432\u043e\u0433\u043e \u0430\u043d\u0430\u043b\u0438\u0437\u0430\u0442\u043e\u0440\u0430 bettercap, \u0434\u043e\u0441\u0440\u043e\u0447\u043d\u043e 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