{"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\/sq\/blog\/news\/udalyonno-ekspluatiruemye-uyazvimosti-v-servere-pechati-cups","title":{"rendered":"Vulnerabilitetet e shfryt\u00ebzuara n\u00eb distanc\u00ebn n\u00eb serverin e printimit CUPS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Simone Margaritelli, autor i firewall-it OpenSnitch dhe analizuesit t\u00eb rrjeteve bettercap, ka zbuluar informacionin mbi dob\u00ebsit\u00eb kritike t\u00eb paralajm\u00ebruara m\u00eb her\u00ebt, t\u00eb cilat lejojn\u00eb sulme t\u00eb larg\u00ebt mbi shp\u00ebrndarjet GNU\/Linux, Solaris, FreeBSD dhe disa sisteme t\u00eb tjera BSD. Fillimisht, publikimi ishte planifikuar p\u00ebr 6 tetor, por p\u00ebr shkak t\u00eb rrjedhjes s\u00eb informacionit, informacioni duhej t\u00eb publikohej m\u00eb her\u00ebt, para se shumica e shp\u00ebrndarjeve t\u00eb arrinin t\u00eb p\u00ebrgatitnin p\u00ebrdit\u00ebsimet e pakove. Dob\u00ebsit\u00eb prekin serverin e printimit CUPS dhe lejojn\u00eb ekzekutimin e kodit n\u00eb sistem n\u00eb m\u00ebnyr\u00eb t\u00eb larg\u00ebt pa autentikim.    <\/p>\n<p>K\u00ebrkuesi q\u00eb identifikoi problemin ka p\u00ebrgatitur nj\u00eb prototip funksional t\u00eb nj\u00eb eksploiti, i cili p\u00ebrdor nj\u00eb kombinim t\u00eb disa dob\u00ebsive dhe lejon ekzekutimin e kodit nga distanca me t\u00eb drejtat e procesit p\u00ebrpunues t\u00eb printimit CUPS (zakonisht p\u00ebrdoruesi 'lp'). Eksploiti lejon t\u00eb zamandoj\u00eb n\u00eb fsheht\u00ebsi parametrat e printerit t\u00eb p\u00ebrdoruesit ose t\u00eb shtoj\u00eb nj\u00eb printer t\u00eb ri, i lidhur me nj\u00eb server IPP n\u00eb funksion t\u00eb sulmuesit, i cili ofron nj\u00eb p\u00ebrshkrim PPD t\u00eb formatuar ve\u00e7mas. Trajtimi i k\u00ebtij PPD gjat\u00eb nisjes s\u00eb pun\u00ebs p\u00ebr printim \u00e7on n\u00eb ekzekutimin e kodit t\u00eb sulmuesit (\u00ebsht\u00eb e nevojshme q\u00eb viktima t\u00eb iniciative nj\u00eb printim n\u00eb printerin e zamanduar ose t\u00eb ndryshuar nga sulmuesi).        <\/p>\n<p>Sistemet me <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sq\/server\/dts-prohoster\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3090\">server<\/a> CUPS dhe procesin e funksionit cups-browsed, i cili pranon lidhje rrjetesh n\u00eb portin 631 (UDP). Sulmi gjithashtu mund t\u00eb kryhet nga rrjeti lokal, n\u00eb t\u00eb cilin p\u00ebr qasje n\u00eb <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sq\/server\/dts-shicago\/\"   title=\"serverit\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2943\">serverit<\/a> P\u00ebr printimin p\u00ebrdoren protokollet zeroconf, mDNS ose DNS-SD. Vet\u00ebm konfigurimet e cups-browsed t\u00eb cilat n\u00eb skedarin \/etc\/cups\/cups-browsed.conf, n\u00eb parametrin BrowseRemoteProtocols kan\u00eb vler\u00ebn 'cups' jan\u00eb t\u00eb prekshme. N\u00eb shp\u00ebrndarjet me systemd, kontrolloni p\u00ebrdorimin e sh\u00ebrbimit cups-browsed me komand\u00ebn 'sudo systemctl status cups-browsed'.          <\/p>\n<p>Dob\u00ebsia shfaqet n\u00eb t\u00eb gjitha sistemet e printimit q\u00eb bazohen n\u00eb CUPS, t\u00eb cilat p\u00ebrdorin versi t\u00eb prekshme t\u00eb pakove cups-filters, libcupsfilters, libppd dhe cups-browsed. Riparimet deri tani jan\u00eb n\u00eb form\u00ebn e patch-eve (1, 2, 3) - versionet aktuale cups-filters 2.0.1, libcupsfilters 2.1b1, libppd 2.1b1 dhe cups-browsed 2.0.1 jan\u00eb t\u00eb prekshme. N\u00eb shp\u00ebrndarjet, problemi mbetet i pa zgjidhur, mund t\u00eb ndiqni shfaqjen e azhurnimeve n\u00eb k\u00ebto faqe: Debian, Ubuntu, RHEL, SUSE\/openSUSE, Fedora, Arch, FreeBSD. Si nj\u00eb rrug\u00ebdalje sigurie deri n\u00eb instalimin e azhurnimit, mund t\u00eb kufizoni aksesin n\u00eb portin UDP 631 p\u00ebr \u0627\u0644\u0634\u0628\u0643\u0627\u062a \u0627\u0644\u062e\u0627\u0631\u062c\u064a, t\u00eb \u00e7aktivizoni sh\u00ebrbimin cups-browsed ose t\u00eb vendosni parametrin BrowseRemoteProtocols n\u00eb vler\u00ebn 'none'.      <\/p>\n<p>Vulnerabilitetet e identifikuara:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2024-47176 - dob\u00ebsia n\u00eb procesin cups-browsed, i cili krijon nj\u00eb soket rrjeti q\u00eb pranon lidhje n\u00eb portin 631, i lidhur me t\u00eb gjitha nd\u00ebrfaqet rrjetore t\u00eb disponueshme n\u00eb sistem dhe pranon k\u00ebrkesat IPP 'Get-Printer-Attributes' nga \u00e7do sistem t\u00eb jasht\u00ebm. P\u00ebrmes manipulimit t\u00eb k\u00ebtij sh\u00ebrbimi, mund t\u00eb arrihet t\u00eb shtohet nj\u00eb printer n\u00eb sistem, i kontrolluar nga sulmuesi, dhe t\u00eb eksploatohet shk\u00ebmbimi i konfiguracionit PPD p\u00ebr dob\u00ebsit\u00eb n\u00eb komponent\u00ebt e tjer\u00eb t\u00eb CUPS.\n<li class=\"l\"> CVE-2024-47177 \u2014 vulnerabilitet n\u00eb p\u00ebrpunuesin foomatic-rip nga grupi cups-filters, e cila lejon ekzekutimin e kodit p\u00ebrmes kalimit t\u00eb parametrave FoomaticRIPCommandLine n\u00eb skedarin PPD, i cili mund t\u00eb d\u00ebrgohet nga sulmuesi fal\u00eb vulnerabilitetit t\u00eb p\u00ebrshkruar m\u00eb sip\u00ebr n\u00eb cups-browsed. Komandat shell t\u00eb caktuara n\u00eb parametrin FoomaticRIPCommandLine ekzekutohen si jan\u00eb, pa marr\u00eb parasysh se ky paramet\u00ebr mund t\u00eb vendoset nga nj\u00eb pal\u00eb e tret\u00eb. P\u00ebr shembull, p\u00ebr t\u00eb shkruar n\u00eb skedarin \/tmp\/VULNERABLE mund t\u00eb vendosni \"FoomaticRIPCommandLine: \"echo 1 &gt; \/tmp\/VULNERABLE\".\n<li class=\"l\"> CVE-2024-47175 \u2014 vulnerabilitet n\u00eb libppd, i shkaktuar nga mungesa e verifikimit t\u00eb sakt\u00ebsis\u00eb s\u00eb vler\u00ebs ppdCreatePPDFromIPP2 gjat\u00eb shkrimit t\u00eb atributeve IPP n\u00eb nj\u00eb skedar t\u00eb p\u00ebrkohsh\u00ebm PPD. Ky problem lejon kalimin e t\u00eb dh\u00ebnave t\u00eb rast\u00ebsishme n\u00eb skedarin p\u00ebrfundimtar PPD p\u00ebrmes lidhjes s\u00eb atributeve, duke p\u00ebrdorur karakterin e kalimit n\u00eb rresht. P\u00ebr shembull, mund t\u00eb kaloni verifikimin dhe s\u00eb bashku me atribute t\u00eb lejueshme t\u00eb vendosni atributin FoomaticRIPCommandLine p\u00ebr t\u00eb shfryt\u00ebzuar vulnerabilitetin e p\u00ebrmendur m\u00eb lart n\u00eb cups-filters.\n<li class=\"l\"> CVE-2024-47076 \u2014 vulnerabilitet n\u00eb bibliotek\u00ebn libcupsfilters nga paketa cups-filters, q\u00eb lidhet me munges\u00ebn e verifikimit t\u00eb vlerave cfGetPrinterAttributes5, t\u00eb kthyera nga nj\u00eb server IPP i jasht\u00ebm, e cila i jep mund\u00ebsin\u00eb sulmuesit t\u00eb organizoj\u00eb p\u00ebrpunimin e atributeve t\u00eb rast\u00ebsishme IPP n\u00eb sisteme t\u00eb tjera CUPS, p\u00ebr shembull, gjat\u00eb gjenerimit t\u00eb skedareve PPD.      <\/ul>\n<p>Skenari i sulmit ndaj CUPS p\u00ebrfshin hapat e m\u00ebposht\u00ebm:    <\/p>\n<ul>\n<li class=\"l\"> Marrja e nj\u00eb serveri IPP t\u00eb kontrolluar nga sulmuesi.\n<li class=\"l\"> D\u00ebrgimi i nj\u00eb pakete UDP tek viktima me nj\u00eb lidhje n\u00eb printerin e lidhur me serverin IPP t\u00eb nisur nga sulmuesi.\n<li class=\"l\"> Pas marrjes s\u00eb k\u00ebsaj pakete, sistemi i viktim\u00ebs lidhet me serverin IPP t\u00eb sulmuesit dhe k\u00ebrkon atributet e printerit.\n<li class=\"l\"> N\u00eb p\u00ebrgjigje t\u00eb k\u00ebrkes\u00ebs s\u00eb viktim\u00ebs, serveri IPP i sulmuesit kthen nj\u00eb skedar PPD me atribute, midis t\u00eb cilave \u00ebsht\u00eb atributi FoomaticRIPCommandLine. Ky atribut lidhet me nj\u00eb nga atribute t\u00eb pranueshme, duke p\u00ebrdorur simbolin 1\n n\u00eb nj\u00eb rresht (p\u00ebr shembull, \"cupsPrivacyURI: \"https:\/\/www.google.com\/\nFoomaticRIPCommandLine: \"), \u00e7far\u00eb lejon kalimin e verifikimit dhe rezulton n\u00eb regjistrimin e FoomaticRIPCommandLine si nj\u00eb atribut t\u00eb ve\u00e7ant\u00eb kur ruhet e dh\u00ebna e marr\u00eb n\u00eb nj\u00eb skedar t\u00eb p\u00ebrkohsh\u00ebm.\n<li class=\"l\"> Si rezultat i p\u00ebrpunimit t\u00eb atributeve t\u00eb d\u00ebrguara n\u00eb sistemin e viktim\u00ebs krijohet nj\u00eb skedar PPD: ... *cupsSNMPSupplies: False *cupsLanguages: \"en\" *cupsPrivacyURI: \"https:\/\/www.google.com\/\" *FoomaticRIPCommandLine: \"echo 1 &gt; \/tmp\/I_AM_VULNERABLE\" *cupsFilter2 : \"application\/pdf application\/vnd.cups-postscript 0 foomatic-rip\" *cupsSingleFile: True *cupsFilter2: \"application\/vnd.cups-pdf application\/pdf 0 -\" ...\n<li class=\"l\"> Kur printohet n\u00eb printerin e p\u00ebrzgjedhur nga sulmuesi n\u00eb sistemin e viktim\u00ebs, do t\u00eb ekzekutohet komanda \"echo 1 &gt; \/tmp\/I_AM_VULNERABLE\".   <\/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>Hulumtuesi q\u00eb zbuloi cenueshm\u00ebrin\u00eb sh\u00ebnon se i nevojiteshin disa dit\u00eb p\u00ebr t\u00eb gjetur cenueshm\u00ebrin\u00eb, por m\u00eb pas pasoi nj\u00eb shk\u00ebmbim i zgjatur me zhvilluesit e projektit OpenPrinting p\u00ebr t\u00eb bindur ata p\u00ebr r\u00ebnd\u00ebsin\u00eb e problemit dhe nevoj\u00ebn p\u00ebr p\u00ebrgatitjen e patch-eve. Diskutimi ngeci n\u00eb mosmarr\u00ebveshje mbi n\u00ebse duhet t\u00eb rregulloheshin k\u00ebto probleme, dhe situata u kthye vet\u00ebm duke ngritur nj\u00eb buj\u00eb publike p\u00ebr zbulimin e nj\u00eb problemi kritik. Gjithashtu \u00ebsht\u00eb interesante shfaqja e nj\u00eb rrjedhjeje informacioni, gjat\u00eb s\u00eb cil\u00ebs raporti konfidencial dhe eksploiti t\u00eb dor\u00ebzuar n\u00eb CERT u shfaq\u00ebn n\u00eb forumet breachforums.st n\u00eb akses t\u00eb hapur, pavar\u00ebsisht nga embargot p\u00ebr zbulimin e informacionit.<br \/>\n<br \/>Burimi: <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 5.0.2 - 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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