{"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\/da\/blog\/news\/udalyonno-ekspluatiruemye-uyazvimosti-v-servere-pechati-cups","title":{"rendered":"Fjernudnyttede s\u00e5rbarheder i CUPS printserveren","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Simone Margaritelli, forfatteren af firewall OpenSnitch og netv\u00e6rksanalysatoren bettercap, afsl\u00f8rede for tidligt information om tidligere annoncerede kritiske s\u00e5rbarheder, der tillader fjernangreb p\u00e5 GNU\/Linux, Solaris, FreeBSD og nogle andre BSD-systemer. Oprindeligt var offentligg\u00f8relsen planlagt til den 6. oktober, men p\u00e5 grund af l\u00e6kage af information m\u00e5tte oplysningerne offentligg\u00f8res tidligere, f\u00f8r de fleste distributioner kunne n\u00e5 at forberede opdateringer. S\u00e5rbarhederne ber\u00f8rer CUPS printserveren og tillader eksekvering af kode i systemet uden autentifikation.    <\/p>\n<p>Den forsker, der har identificeret problemet, har forberedt en fungerende prototype af exploit, som bruger en kombination af flere s\u00e5rbarheder og muligg\u00f8r fjernudf\u00f8relse af kode med rettigheder for CUPS udskrivningsjob-processen (som normalt tilh\u00f8rer brugeren \u00ablp\u00bb). Exploiten g\u00f8r det muligt diskret at \u00e6ndre brugerens printerindstillinger eller tilf\u00f8je en ny printer, der er koblet til en k\u00f8rende angribers IPP-server, som leverer en specielt udformet PPD-printerbeskrivelse. Behandling af denne PPD, mens der k\u00f8res en udskrivningsopgave, f\u00f8rer til udf\u00f8relse af angriberens kode (det er n\u00f8dvendigt, at offeret initierer udskrivning til den manipulerede eller erstattede printer).        <\/p>\n<p>Systemer med <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/da\/server\/dts-prohoster\/\"   title=\"serveren\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3090\">serveren<\/a> CUPS printserver og en k\u00f8rende cups-browsed proces, der accepterer netv\u00e6rksforbindelser p\u00e5 port 631 (UDP) er s\u00e5rbare. Angrebet kan ogs\u00e5 udf\u00f8res fra det lokale netv\u00e6rk, hvor protokoller som zeroconf, mDNS eller DNS-SD anvendes til at f\u00e5 adgang til <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/da\/server\/dts-shicago\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2943\">server<\/a> Under udskrivning anvendes protokollerne zeroconf, mDNS eller DNS-SD. Kun konfigurationer af cups-browsed, hvor v\u00e6rdien \u00abcups\u00bb er angivet i parameteren BrowseRemoteProtocols i filen \/etc\/cups\/cups-browsed.conf, er s\u00e5rbare. I distributioner med systemd kan brugen af cups-browsed-tjenesten kontrolleres med kommandoen \u00absudo systemctl status cups-browsed\u00bb.          <\/p>\n<p>S\u00e5rbarheden findes i alle CUPS-baserede printsystemer, der bruger s\u00e5rbare versioner af pakkerne cups-filters, libcupsfilters, libppd og cups-browsed. Der er i \u00f8jeblikket kun tilg\u00e6ngelige rettelser i form af patches (1, 2, 3) \u2014 de relevante versioner af cups-filters 2.0.1, libcupsfilters 2.1b1, libppd 2.1b1 og cups-browsed 2.0.1 er s\u00e5rbare. I distributionerne forbliver problemet udbedret; man kan f\u00f8lge opdateringer p\u00e5 f\u00f8lgende sider: Debian, Ubuntu, RHEL, SUSE\/openSUSE, Fedora, Arch, FreeBSD. Som en midlertidig beskyttelsesforanstaltning, indtil opdateringen er installeret, kan adgangen til UDP-port 631 lukkes for eksterne netv\u00e6rk, cups-browsed-tjenesten deaktiveres eller BrowseRemoteProtocols indstilles til v\u00e6rdien \u00abnone\u00bb.      <\/p>\n<p>Identificerede s\u00e5rbarheder:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2024-47176 \u2014 en s\u00e5rbarhed i cups-browsed processen, der opretter et netv\u00e6rkssocket, som modtager forbindelser p\u00e5 port 631, knyttet til alle tilg\u00e6ngelige netv\u00e6rksinterfaces i systemet, og modtager IPP-anmodninger \u00abGet-Printer-Attributes\u00bb fra enhver ekstern system. Gennem manipulation af denne tjeneste kan man tilf\u00f8je en printer, der kontrolleres af angriberen, til systemet og udnytte s\u00e5rbarheden i andre CUPS-komponenter via overf\u00f8rsel af PPD-konfiguration.\n<li class=\"l\"> CVE-2024-47177 \u2014 s\u00e5rbarhed i foomatic-rip-h\u00e5ndtereren fra cups-filters, der tillader udf\u00f8relse af kode ved at overf\u00f8re parameteren FoomaticRIPCommandLine i PPD-filen, som angriberen kan levere ved hj\u00e6lp af den ovenn\u00e6vnte s\u00e5rbarhed i cups-browsed. De angivne shell-kommandoer i FoomaticRIPCommandLine-parameteren udf\u00f8res som de er, uden hensyntagen til at parameteren kan blive stillet af en tredjepart. For eksempel kan man angive \"FoomaticRIPCommandLine: \"echo 1 &gt; \/tmp\/VULNERABLE\" for at skrive til filen \/tmp\/VULNERABLE.\n<li class=\"l\"> CVE-2024-47175 \u2014 s\u00e5rbarhed i libppd, for\u00e5rsaget af manglende validering af v\u00e6rdien ppdCreatePPDFromIPP2 ved skrivning af IPP-attributter til en midlertidig PPD-fil. Problemet tillader indspr\u00f8jtning af vilk\u00e5rlige data i den resulterende PPD-fil ved at vedh\u00e6fte attributter ved brug af linjeskifttegn. For eksempel kan man omg\u00e5 valideringen og sammen med de tilladte attributter inkludere attributten FoomaticRIPCommandLine for at udnytte den f\u00f8rn\u00e6vnte s\u00e5rbarhed i cups-filters.\n<li class=\"l\"> CVE-2024-47076 \u2014 s\u00e5rbarhed i libcupsfilters-biblioteket fra cups-filters-pakken, relateret til manglende validering af v\u00e6rdierne cfGetPrinterAttributes5, der returneres af en ekstern IPP-server, hvilket giver angriberen mulighed for at organisere behandlingen af vilk\u00e5rlige IPP-attributter i andre CUPS-underomr\u00e5der, for eksempel ved generation af PPD-filer.      <\/ul>\n<p>Angrebsvejen til CUPS kan opsummeres i f\u00f8lgende trin:    <\/p>\n<ul>\n<li class=\"l\"> Udrulning af en angrebsvens egen IPP-server.\n<li class=\"l\"> Sending af en UDP-pakke til offeret med et link til den printer, der er knyttet til den k\u00f8rende IPP-server fra angriberen.\n<li class=\"l\"> Efter modtagelsen af denne pakke opretter offerets system forbindelse til angriberens IPP-server og anmoder om printerens attributter.\n<li class=\"l\"> Som svar p\u00e5 anmodningen fra offerets IPP-server returnerer angriberen en PPD-fil med attributter, hvoraf en er FoomaticRIPCommandLine. Denne attribut bindes til en af de tilladte attributter ved at bruge tegnene \"\n\" i \u00e9n linje (for eksempel \"cupsPrivacyURI: \"https:\/\/www.google.com\/\n*FoomaticRIPCommandLine: \"), hvilket tillader omg\u00e5else af valideringen og f\u00f8rer til, at FoomaticRIPCommandLine skrives som en separat attribut, n\u00e5r de modtagne data gemmes i en midlertidig fil.\n<li class=\"l\"> Som f\u00f8lge af behandlingen af de overf\u00f8rte attributter i offerets system oprettes en PPD-fil: ... *cupsSNMPSupplies: False *cupsLanguages: \"da\" *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\"> Ved udskrivning til den angrebne printer p\u00e5 offerets system vil kommandoen \"echo 1 &gt; \/tmp\/I_AM_VULNERABLE\" blive udf\u00f8rt.   <\/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>Forskeren, der opdagede s\u00e5rbarhederne, bem\u00e6rker, at det tog ham et par dage at finde s\u00e5rbarheden, men derefter fulgte en langvarig korrespondance, der varede 22 dage, med udviklerne af OpenPrinting-projektet i et fors\u00f8g p\u00e5 at overbevise dem om vigtigheden af problemet og n\u00f8dvendigheden af at forberede patches. Diskussionen blev fastl\u00e5st i stridigheder om, hvorvidt de n\u00e6vnte problemer overhovedet skulle rettes, og situationen blev f\u00f8rst vendt ved at skabe offentlig opm\u00e6rksomhed omkring opdagelsen af dette kritiske problem. Det er ogs\u00e5 interessant, at der opstod en l\u00e6kage, hvor den fortrolige rapport og udnyttelsen, der blev sendt til CERT, dukkede op p\u00e5 breachforums.st-forummet i offentligt tilg\u00e6ngelighed, p\u00e5 trods af et embargo mod offentligg\u00f8relse af oplysninger.<br \/>\n<br \/>Kilde: <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 5.0.3 - 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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