{"id":122827,"date":"2025-03-25T04:22:52","date_gmt":"2025-03-25T02:22:52","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-v-pagure-i-obs-dopuskavshie-komprometacziyu-paketov-v-repozitoriyah-fedora-i-opensuse"},"modified":"2025-03-25T04:22:52","modified_gmt":"2025-03-25T02:22:52","slug":"uyazvimosti-v-pagure-i-obs-dopuskavshie-komprometacziyu-paketov-v-repozitoriyah-fedora-i-opensuse","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/uyazvimosti-v-pagure-i-obs-dopuskavshie-komprometacziyu-paketov-v-repozitoriyah-fedora-i-opensuse","title":{"rendered":"S\u00e4kerhetsbrister i Pagure och OBS som m\u00f6jliggjorde kompromettering av paket i Fedora- och openSUSE-repositorier.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>S\u00e4kerhetsforskare fr\u00e5n Fenrisk har avsl\u00f6jat s\u00e5rbarheter i verktygen Pagure och OBS (Open Build Service), vilket gjorde det m\u00f6jligt att kompromittera paketbyggnadsinfrastrukturen f\u00f6r Fedora och openSUSE. Forskarna demonstrerade att det var m\u00f6jligt att genomf\u00f6ra en attack f\u00f6r att utf\u00f6ra godtycklig kod p\u00e5 servrar med Pagure och OBS, vilket kunde anv\u00e4ndas f\u00f6r att inf\u00f6ra \u00e4ndringar i paketen i Fedora- och openSUSE-repositorierna.     <\/p>\n<p>I Pagure-plattformen, som anv\u00e4nds i Fedora f\u00f6r samarbete kring kod och paketmetadata, har 4 s\u00e5rbarheter identifierats. F\u00f6r att utnyttja de identifierade problemen kr\u00e4vs det att man har ett konto i Pagure, vilket vem som helst kan skaffa (f\u00f6r n\u00e4rvarande \u00e4r 24899 anv\u00e4ndare registrerade p\u00e5 Pagure.io). Tre av problemen m\u00f6jligg\u00f6r att filer kan l\u00e4sas i systemet, och ett problem kan m\u00f6jligg\u00f6ra att k\u00f6ra egen kod p\u00e5. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sv\/server\/dts-newyork\/\"   title=\"servern\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2806\">servern<\/a>. Problemen identifierades den 1 januari 2024, rapporterades via bugzilla.redhat.com den 25 april 2024 och \u00e5tg\u00e4rdades i Pagure inom 3 timmar.    <\/p>\n<ul>\n<li class=\"l\"> S\u00e5rbarheterna CVE-2024-4981 och CVE-2024-47515 orsakas av felaktig hantering av symboliska l\u00e4nkar i funktionerna f\u00f6r filuppdatering och arkivgenerering. S\u00e5rbarheterna m\u00f6jligg\u00f6r att inneh\u00e5llet i lokala filer p\u00e5 servern kan l\u00e4sas, till exempel kan inneh\u00e5llet i filen med adminsessionens parametrar f\u00f6r Pagure avsl\u00f6jas och \u00e5tkomst ges med dess r\u00e4ttigheter. Utnyttjande av s\u00e5rbarheten i funktionen _update_file_in_git() inneb\u00e4r att man skapar ett repository i Pagure; l\u00e4gger till en commit med en ny fil som skapats som en symbolisk l\u00e4nk till \u00f6nskad systemfil; \u00f6ppnar denna fil f\u00f6r redigering i webbgr\u00e4nssnittet.\n<li class=\"l\"> S\u00e5rbarhet (CVE-2024-4982) i funktionen view_issue_raw_file() till\u00e5ter att man g\u00e5r utanf\u00f6r grundkatalogen genom att ange tecknen \u00ab\/..\u00bb i parametrarna f\u00f6r den beg\u00e4rda fr\u00e5gan. Problemet g\u00f6r det m\u00f6jligt att l\u00e4sa filer i systemet, beroende p\u00e5 r\u00e4ttigheterna f\u00f6r den process som webgr\u00e4nssnittet k\u00f6rs under. Till exempel f\u00f6r att visa filen \/etc\/passwd kan man \u00f6ppna sidan \u00abhttp:\/\/pagure.local:5000\/your-repository\/issue\/raw\/....\/....\/....\/....\/....\/....\/....\/etc\/passwd\u00bb.\n<li class=\"l\"> S\u00e5rbarhet (CVE-2024-47516) i funktionen PagureRepo.log() ger m\u00f6jligheten att injicera egna kommandon och k\u00f6ra kod p\u00e5 servern. Problemet orsakas av att n\u00e4r man visar filhistorik genom webgr\u00e4nssnittet anropas kommandot \u00abgit\u00bb med \u00f6verf\u00f6ring av grenens identifierare i kommandoraden (till exempel \u00ab\/usr\/bin\/git --pretty=oneline --abbrev-commit  -- README.md\u00bb). Korrektheten hos identifieraren kontrolleras inte, s\u00e5 ist\u00e4llet kan man skicka vilken kommandoradsparameter som helst, till exempel \u00ab--output=\/tmp\/foo.bar\u00bb f\u00f6r att omdirigera utdata till en fil. Angriparen kan skriva \u00f6ver en fil i systemet genom att skicka en beg\u00e4ran av f\u00f6ljande typ: http:\/\/pagure.local:5000\/test\/history\/README.md?identifier=--output=\/tmp\/foo.bar.\n<p>Pagure k\u00f6rs under anv\u00e4ndaren git, s\u00e5 det \u00e4r bara filer som tillh\u00f6r den anv\u00e4ndaren som kan skrivas \u00f6ver. F\u00f6r att k\u00f6ra sin kod p\u00e5 servern kan man anv\u00e4nda en tj\u00e4nst f\u00f6r \u00e5tkomst till f\u00f6rr\u00e5d via SSH, d\u00e4r kommandot \u00abbash -c \/usr\/libexec\/pagure\/aclchecker.py\u00bb k\u00f6rs vid \u00e5tkomst. Angriparen kan utnyttja s\u00e5rbarheten f\u00f6r att skriva \u00f6ver filen \u00ab\/srv\/git\/.bashrc\u00bb och denna fil kommer att k\u00f6ras av kommandotolk bash vid anslutning till f\u00f6rr\u00e5det via ssh.      <\/p>\n<p>Attacken g\u00e5r ut p\u00e5 att registrera sig i systemet Pagure, skapa ett f\u00f6rr\u00e5d, l\u00e4gga till en fil README.md med ett commit-kommentar av typen \u00ab|| \/bin\/bash\u00bb och skicka en beg\u00e4ran \u00abhttp:\/\/pagure.local:5000\/test\/history\/README.md?identifier=--output=\/srv\/git\/.bashrc\u00bb. Under dessa steg kommer str\u00e4ngen \u00ab34\u04305\u044143 || \/bin\/bash\u00bb att skrivas till filen \u00ab\/srv\/git\/.bashrc\u00bb. F\u00f6r att k\u00f6ra den skapade filen \u00ab\/srv\/git\/.bashrc\u00bb r\u00e4cker det att ansluta till f\u00f6rr\u00e5det via SSH med sitt personliga konto. Utf\u00f6randet av kod med r\u00e4ttigheterna f\u00f6r anv\u00e4ndaren git p\u00e5 servern Pagure m\u00f6jligg\u00f6r kontroll \u00f6ver allt inneh\u00e5ll i f\u00f6rr\u00e5d med paket.    <\/ul>\n<p>    <center><iframe title=\"Pagure\" src=\"https:\/\/player.vimeo.com\/video\/1066145210?h=0716980f9b\" width=\"640\" height=\"360\" frameborder=\"0\" allowfullscreen style =\"max-width: 100%;\" loading=\"lazy\"><\/iframe><\/center>        <\/p>\n<p>I plattformen OBS (Open Build Service), som anv\u00e4nds av openSUSE och vissa andra distributioner f\u00f6r att bygga paket, har en s\u00e5rbarhet identifierats (CVE-2024-22033) som m\u00f6jligg\u00f6r exekvering av egen kod p\u00e5 servern. S\u00e5rbarheten identifierades den 27 juni 2024, rapporterades till openSUSE-projektet den 29 juni och \u00e5tg\u00e4rdades den 10 juli.    <\/p>\n<p>S\u00e5rbarheten finns i tj\u00e4nsten &#171;obs-service-download_url&#187;, d\u00e4r det saknades korrekt kontroll av URL:en som anv\u00e4nds vid k\u00f6rning av wget-verktyget fr\u00e5n skriptet som laddar ner k\u00e4llkoden till OBS. En angripare kan ange en konfiguration f\u00f6r det paket som skapas i OBS d\u00e4r alternativet f\u00f6r kommandorad f\u00f6r wget ist\u00e4llet f\u00f6r URL:en f\u00f6r nedladdning av koden anges, till exempel:       &lt;services&gt;     &lt;service name=&#187;download_url&#187;&gt;     &lt;param name=&#187;url&#187;&gt;&#8212;output-document=\\\/tmp\\\/test&lt;\\\/param&gt;     &lt;param name=&#187;download-manifest&#187;&gt;tempfile&lt;\\\/param&gt;     &lt;\\\/service&gt;     &lt;\\\/services&gt;      <\/p>\n<p> F\u00f6r att undvika att f\u00e5 ett felmeddelande vid f\u00f6rs\u00f6k att k\u00f6ra wget utan URL, anges alternativet &#171;download-manifest&#187; i exemplet, vilket till\u00e5ter att ange en lista \u00f6ver URL:er i en separat fil. Det ovan n\u00e4mnda exemplet kommer att resultera i att kommandot k\u00f6rs:       \\\/usr\\\/bin\\\/wget -i \\\/srv\\\/obs\\\/service\\\/XXXXX\\\/src\\\/tempfile -4 &#8212;output-document=\\\/tmp\\\/test    <\/p>\n<p>som till\u00e5ter att inneh\u00e5llet som laddas ner fr\u00e5n l\u00e4nken angiven i filen \\\/srv\\\/obs\\\/service\\\/XXXXX\\\/src\\\/tempfile skrivs till filen \\\/tmp\\\/test fr\u00e5n koden som angriparen laddade upp till OBS via gr\u00e4nssnittet build.opensuse.org, som till\u00e5ter fri registrering. F\u00f6rutom att skriva \u00f6ver en fil p\u00e5 servern kan angriparen ocks\u00e5 skicka sig sj\u00e4lv vilken fil som helst genom att ange alternativet &#171;&#8212;output-document&#187; ist\u00e4llet f\u00f6r &#171;&#8212;post-file&#187;, till exempel &#171;&#8212;post-file=\\\/etc\\\/passwd&#187;. P\u00e5 s\u00e5 s\u00e4tt kan angriparen l\u00e4sa och skriva filer p\u00e5 servern, beroende p\u00e5 de beh\u00f6righeter som tj\u00e4nsten OBS k\u00f6rs med.    <\/p>\n<p>F\u00f6r att omvandla m\u00f6jligheten att skriva till en fil till att k\u00f6ra kod p\u00e5 servern f\u00f6reslog forskarna en metod som best\u00e5r av tv\u00e5 steg. De tv\u00e5 stegen \u00e4r n\u00f6dv\u00e4ndiga, s\u00e5 att angriparen kan skapa en fil &#171;.wgetrc&#187; med inst\u00e4llningar f\u00f6r wget, men det r\u00e4cker inte f\u00f6r att k\u00f6ra kommandon. Men genom &#171;.wgetrc&#187; kan alla program i systemet k\u00f6ras utan att ge dem argument. F\u00f6r att k\u00f6ra godtycklig kod f\u00f6reslogs att k\u00f6ra programmet &#171;prove&#187;, som behandlar konfigurationsfilen &#171;.proverc&#187;, vilket till\u00e5ter att ange alternativet &#171;&#8212;exec&#187; f\u00f6r att utf\u00f6ra vilken kod som helst.     <\/p>\n<p>I det f\u00f6rsta steget skapas en fil med namnet \".proverc\" i hemmappen f\u00f6r anv\u00e4ndaren \"obsservicerun\" genom de ovann\u00e4mnda manipuleringarna med \"download-manifest\". Denna fil inkluderar kommandon som kommer att utf\u00f6ras vid starten av processen \"prove\". I det andra steget skapas en fil \".wgetrc\" med parametern \"use-askpass=\\\/usr\\\/bin\\\/prove\", vilket leder till att \"prove\" anropas. N\u00e4r dessa filer har skapats r\u00e4cker det att skapa f\u00f6ruts\u00e4ttningar f\u00f6r nedladdning av valfria data med hj\u00e4lp av wget, och detta kommer att leda till att angriparens kod k\u00f6rs p\u00e5 servern med anv\u00e4ndarr\u00e4ttigheter f\u00f6r \"obsservicerun\". Anv\u00e4ndarr\u00e4ttigheterna f\u00f6r \"obsservicerun\" \u00e4r tillr\u00e4ckliga f\u00f6r att h\u00e4mta nycklar fr\u00e5n arkiv som anv\u00e4nds av OBS-anv\u00e4ndare f\u00f6r att signera paket.     <center>  <iframe title=\"Open Build Service\" src=\"https:\/\/player.vimeo.com\/video\/1066093605?h=d7a210d719\" width=\"640\" height=\"360\" frameborder=\"0\" allowfullscreen style =\"max-width: 100%;\" loading=\"lazy\"><\/iframe><\/center>    <\/p>\n<p>Till\u00e4gg: SUSE Product Security anser att faran med s\u00e5rbarheten i OBS \u00e4r \u00f6verdriven och att forskarnas p\u00e5st\u00e5ende om att problemet kan kompromettera alla paket i openSUSE-distributionen inte st\u00e4mmer. Det noteras att tj\u00e4nster i infrastrukturen build.opensuse.org k\u00f6rs i isolerade containrar som \u00e5terskapas och saknar kritisk information. Den identifierade s\u00e5rbarheten bed\u00f6ms som farlig men otillr\u00e4cklig f\u00f6r att kompromettera bygginfrastrukturen i openSUSE och de skapade paketen. Dessutom anges att \u00e5tg\u00e4rderna i OBS-gr\u00e4nssnittet, som beskrivs i attackexemplet, endast kunde utf\u00f6ras i den lokala versionen av OBS installerad p\u00e5 utvecklarens arbetsstation.<br \/>\n<br \/>K\u00e4lla: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=62928\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Fenrisk \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0438 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 \u0432 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u044f\u0445 Pagure \u0438 OBS (Open Build Service), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0432\u0448\u0438\u0445 \u0441\u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0438\u043d\u0444\u0440\u0430\u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b \u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u043e\u0432 Fedora \u0438 openSUSE. \u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u043f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043b\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u0430\u0442\u0430\u043a\u0438 \u0434\u043b\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u043e\u0433\u043e \u043a\u043e\u0434\u0430 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0430\u0445 \u0441 Pagure \u0438 OBS, \u0447\u0442\u043e \u043c\u043e\u0436\u043d\u043e \u0431\u044b\u043b\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u043f\u043e\u0434\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0438 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439 \u0432 \u043f\u0430\u043a\u0435\u0442\u044b \u0432 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u044f\u0445 Fedora \u0438 openSUSE. [&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-122827","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=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Fenrisk \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0438 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 \u0432 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