{"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\/sv\/blog\/news\/udalyonno-ekspluatiruemye-uyazvimosti-v-servere-pechati-cups","title":{"rendered":"Fj\u00e4rrutnyttjade s\u00e5rbarheter i CUPS utskriftsserver","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Simone Margaritelli, f\u00f6rfattare till brandv\u00e4ggen OpenSnitch och n\u00e4tverksanalysverktyget bettercap, har i f\u00f6rtid avsl\u00f6jat information om tidigare annonserade kritiska s\u00e5rbarheter som m\u00f6jligg\u00f6r fj\u00e4rrattacker mot distributioner av GNU\/Linux, Solaris, FreeBSD och vissa andra BSD-system. Publiceringen var ursprungligen planerad till den 6 oktober, men p\u00e5 grund av informationsl\u00e4ckan tvingades informationen publiceras i f\u00f6rtid, innan de flesta distributionerna hann f\u00f6rbereda uppdateringar av paketen. S\u00e5rbarheterna ber\u00f6r utskriftstj\u00e4nsten CUPS och m\u00f6jligg\u00f6r fj\u00e4rraktivering av kod p\u00e5 systemet utan autentisering.    <\/p>\n<p>Forskaren som uppt\u00e4ckte problemet har f\u00f6rberett en fungerande prototyp av ett exploit som anv\u00e4nder en kombination av flera s\u00e5rbarheter och m\u00f6jligg\u00f6r fj\u00e4rrk\u00f6rning av kod med r\u00e4ttigheter fr\u00e5n CUPS utskriftsprocess (vanligtvis anv\u00e4ndaren \"lp\"). Exploit\u2019en g\u00f6r det m\u00f6jligt att diskret ers\u00e4tta anv\u00e4ndarens skrivare eller l\u00e4gga till en ny skrivare kopplad till en attackerande IPP-server som ger ett specialformat PPD-beskrivning av skrivaren. Behandlingen av detta PPD vid utskriftsstart leder till utf\u00f6randet av attackerande kod (det \u00e4r n\u00f6dv\u00e4ndigt att offret initierar utskrift p\u00e5 den falska eller ersatta skrivaren av angriparen).        <\/p>\n<p>System med <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sv\/server\/dts-prohoster\/\"   title=\"servern\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3090\">servern<\/a> CUPS-utskrift och den aktiva processen cups-browsed, som tar emot n\u00e4tverksanslutningar p\u00e5 port 631 (UDP), \u00e4r utsatta f\u00f6r attack. Attacken kan \u00e4ven utf\u00f6ras fr\u00e5n det lokala n\u00e4tverket d\u00e4r protokoll som zeroconf, mDNS eller DNS-SD anv\u00e4nds f\u00f6r att f\u00e5 tillg\u00e5ng till <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sv\/server\/dts-shicago\/\"   title=\"servern\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2943\">servern<\/a> Skrivning anv\u00e4nder protokollen zeroconf, mDNS eller DNS-SD. Endast konfigurationer av cups-browsed d\u00e4r v\u00e4rdet \"cups\" \u00e4r angivet i parametern BrowseRemoteProtocols i filen \/etc\/cups\/cups-browsed.conf \u00e4r s\u00e5rbara. I distributioner med systemd kan anv\u00e4ndningen av tj\u00e4nsten cups-browsed kontrolleras med kommandot \"sudo systemctl status cups-browsed\".          <\/p>\n<p>S\u00e5rbarheten f\u00f6rekommer i alla CUPS-baserade utskriftssystem som anv\u00e4nder s\u00e5rbara versioner av paketen cups-filters, libcupsfilters, libppd och cups-browsed. Fixar \u00e4r f\u00f6r n\u00e4rvarande endast tillg\u00e4ngliga i form av patchar (1, 2, 3) \u2014 aktuella versioner av cups-filters 2.0.1, libcupsfilters 2.1b1, libppd 2.1b1 och cups-browsed 2.0.1 \u00e4r s\u00e5rbara. I distributioner f\u00f6rblir problemet oboten, och uppdateringar kan \u00f6vervakas p\u00e5 f\u00f6ljande sidor: Debian, Ubuntu, RHEL, SUSE\/openSUSE, Fedora, Arch, FreeBSD. Som en l\u00f6sning f\u00f6r att skydda sig tills uppdateringen installeras kan man st\u00e4nga av UDP-port 631 f\u00f6r externa n\u00e4tverk, st\u00e4nga av tj\u00e4nsten cups-browsed eller s\u00e4tta parametern BrowseRemoteProtocols till v\u00e4rdet \"none\".      <\/p>\n<p>Uppt\u00e4ckta s\u00e5rbarheter:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2024-47176 \u2014 s\u00e5rbarhet i cups-browsed processen, som skapar en n\u00e4tverks socket som accepterar anslutningar p\u00e5 port 631, kopplad till alla tillg\u00e4ngliga n\u00e4tverksgr\u00e4nssnitt i systemet och tar emot IPP-f\u00f6rfr\u00e5gningar \"Get-Printer-Attributes\" fr\u00e5n externa system. Genom att manipulera denna tj\u00e4nst kan man l\u00e4gga till en skrivare i systemet som kontrolleras av angriparen och utnyttja s\u00e5rbarheten genom att \u00f6verf\u00f6ra PPD-konfigurationen till andra komponenter av CUPS.\n<li class=\"l\"> CVE-2024-47177 \u2014 en s\u00e5rbarhet i foomatic-rip-behandlaren i cups-filters som m\u00f6jligg\u00f6r k\u00f6rning av kod genom att \u00f6verf\u00f6ra parameter FoomaticRIPCommandLine i PPD-filen, vilken en angripare kan skicka tack vare den ovan n\u00e4mnda s\u00e5rbarheten i cups-browsed. Kommando som anges i parameter FoomaticRIPCommandLine k\u00f6rs direkt, utan att ta h\u00e4nsyn till att parameter kan s\u00e4ttas av en extern part. Till exempel kan f\u00f6r att skriva till filen \/tmp\/VULNERABLE anges \"FoomaticRIPCommandLine: \"echo 1 &gt; \/tmp\/VULNERABLE\".\n<li class=\"l\"> CVE-2024-47175 \u2014 en s\u00e5rbarhet i libppd orsakad av bristen p\u00e5 validering av v\u00e4rdet ppdCreatePPDFromIPP2 vid skrivning av IPP-attribut till en tempor\u00e4r PPD-fil. Problemet m\u00f6jligg\u00f6r inmatning av godtyckliga data i den resulterande PPD-filen genom att bifoga attribut med hj\u00e4lp av radbrytningen. Till exempel kan man kringg\u00e5 valideringen och tillsammans med till\u00e5tna attribut bifoga attribut FoomaticRIPCommandLine f\u00f6r att utnyttja den n\u00e4mnda s\u00e5rbarheten i cups-filters.\n<li class=\"l\"> CVE-2024-47076 \u2014 en s\u00e5rbarhet i biblioteket libcupsfilters inom paketet cups-filters, relaterad till bristen p\u00e5 kontroll av v\u00e4rdena cfGetPrinterAttributes5 som returneras av en extern IPP-server, vilket ger Angriparen m\u00f6jligheten att organisera bearbetningen av godtyckliga IPP-attribut i andra CUPS-subsystem, till exempel vid generering av PPD-filer.      <\/ul>\n<p>Angreppsscenariot f\u00f6r CUPS best\u00e5r av f\u00f6ljande steg:    <\/p>\n<ul>\n<li class=\"l\"> Angriparen st\u00e4ller upp sin egen IPP-server.\n<li class=\"l\"> Skicka en UDP-paket med en l\u00e4nk till skrivaren kopplad till den IPP-server som angriparen driver till offret.\n<li class=\"l\"> N\u00e4r offret tar emot detta paket kopplar offrets system till angriparens IPP-server och beg\u00e4r skrivarattribut.\n<li class=\"l\"> Som svar p\u00e5 en f\u00f6rfr\u00e5gan fr\u00e5n offret returnerar angriparens IPP-server en PPD-fil med attribut, d\u00e4r attributet FoomaticRIPCommandLine anges. Detta attribut bifogas ett av de till\u00e5tna attributen med hj\u00e4lp av symbolen \"\n\" i en rad (till exempel \"cupsPrivacyURI: \"https:\/\/www.google.com\/\n*FoomaticRIPCommandLine: \"), vilket g\u00f6r att valideringen kan kringg\u00e5s och resulterar i att FoomaticRIPCommandLine registreras som ett separat attribut n\u00e4r de mottagna data sparas i en tempor\u00e4r fil.\n<li class=\"l\"> Som ett resultat av bearbetningen av de angivna attributen i offrets system skapas en PPD-fil: ... *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\"> Vid utskrift p\u00e5 den av angriparen angivna skrivaren i offrets system kommer kommandot \"echo 1 &gt; \/tmp\/I_AM_VULNERABLE\" att k\u00f6ras.   <\/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>Den forskare som uppt\u00e4ckte s\u00e5rbarheterna noterar att det tog honom ett par dagar att hitta s\u00e5rbarheten, men d\u00e4refter f\u00f6ljde en utdragen korrespondens p\u00e5 22 dagar med utvecklarna av OpenPrinting-projektet i ett f\u00f6rs\u00f6k att \u00f6vertyga dem om betydelsen av problemet och behovet av att f\u00f6rbereda patchar. Diskussionen stagnerade i tvister om huruvida de angivna problemen verkligen borde \u00e5tg\u00e4rdas, och situationen v\u00e4ndes endast genom att skapa offentlig uppst\u00e5ndelse kring uppt\u00e4ckten av det kritiska problemet. Det \u00e4r ocks\u00e5 intressant med l\u00e4ckan av information, d\u00e4r den konfidentiella rapporten och exploiten som skickades till CERT d\u00f6k upp p\u00e5 forumet breachforums.st i \u00f6ppen tillg\u00e5ng, trots det utf\u00e4rdade embargot mot informationsavsl\u00f6jande.<br \/>\n<br \/>K\u00e4lla: <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 5.0.4 - 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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