{"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\/sk\/blog\/news\/uyazvimosti-v-pagure-i-obs-dopuskavshie-komprometacziyu-paketov-v-repozitoriyah-fedora-i-opensuse","title":{"rendered":"Zranite\u013enosti v Pagure a OBS, ktor\u00e9 umo\u017e\u0148ovali kompromit\u00e1ciu bal\u00edkov v repozit\u00e1roch Fedora a openSUSE","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Bezpe\u010dnostn\u00ed v\u00fdzkumn\u00edci ze spole\u010dnosti Fenrisk zve\u0159ejnili informace o zranitelnostech v n\u00e1stroj\u00edch Pagure a OBS (Open Build Service), kter\u00e9 umo\u017enily kompromitovat infrastruktury pro vytv\u00e1\u0159en\u00ed bal\u00ed\u010dk\u016f distribuc\u00ed Fedora a openSUSE. V\u00fdzkumn\u00edci demonstrovali mo\u017enost proveden\u00ed \u00fatoku pro vykon\u00e1n\u00ed libovoln\u00e9ho k\u00f3du na serverech s Pagure a OBS, co\u017e mohlo b\u00fdt vyu\u017eito k \u00faprav\u011b bal\u00ed\u010dk\u016f v repozit\u00e1\u0159\u00edch Fedora a openSUSE.     <\/p>\n<p>Na platform\u011b Pagure, kter\u00e1 se pou\u017e\u00edv\u00e1 ve Fedora ke spolupr\u00e1ci na k\u00f3du a metadatech bal\u00ed\u010dk\u016f, byly odhaleny 4 zranitelnosti. K vyu\u017eit\u00ed odhalen\u00fdch probl\u00e9m\u016f je nutn\u00e9 m\u00edt \u00fa\u010det v slu\u017eb\u011b Pagure, kter\u00fd m\u016f\u017ee z\u00edskat kdokoliv (v sou\u010dasnosti je v Pagure.io registrov\u00e1no 24899 u\u017eivatel\u016f). T\u0159i probl\u00e9my umo\u017e\u0148uj\u00ed \u010d\u00edst soubory v syst\u00e9mu, a jeden probl\u00e9m umo\u017e\u0148uje vykonat v\u00e1\u0161 k\u00f3d na. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sk\/server\/dts-newyork\/\"   title=\"serveri\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2806\">serveri<\/a>. Probl\u00e9my byly odhaleny 1. ledna 2024, nahl\u00e1\u0161eny p\u0159es bugzilla.redhat.com 25. dubna 2024 a odstran\u011bny v Pagure za 3 hodiny.    <\/p>\n<ul>\n<li class=\"l\"> Zranitelnosti CVE-2024-4981 a CVE-2024-47515 jsou zp\u016fsobeny nespr\u00e1vn\u00fdm zpracov\u00e1n\u00edm symbolick\u00fdch odkaz\u016f ve funkc\u00edch aktualizace souboru a generov\u00e1n\u00ed archiv\u016f. Zranitelnosti umo\u017e\u0148uj\u00ed \u010d\u00edst obsah lok\u00e1ln\u00edch soubor\u016f na serveru, nap\u0159. lze zjistit obsah souboru s parametry sezen\u00ed administr\u00e1tora Pagure a z\u00edskat p\u0159\u00edstup s jeho pr\u00e1vy. Vyu\u017eit\u00ed zranitelnosti ve funkci _update_file_in_git() spo\u010d\u00edv\u00e1 ve vytvo\u0159en\u00ed repozit\u00e1\u0159e v Pagure; p\u0159id\u00e1n\u00ed do n\u011bj commitu s nov\u00fdm souborem, kter\u00fd je vytvo\u0159en jako symbolick\u00fd odkaz na po\u017eadovan\u00fd syst\u00e9mov\u00fd soubor; a otev\u0159en\u00ed tohoto souboru pro \u00fapravy v webov\u00e9m rozhran\u00ed.\n<li class=\"l\"> Zranite\u013enos\u0165 (CVE-2024-4982) vo funkcii view_issue_raw_file() umo\u017e\u0148uje prekro\u010di\u0165 z\u00e1kladn\u00fd adres\u00e1r pomocou \u0161pecifik\u00e1cie znakov \u201e\/..\u201c v parametroch po\u017eadovan\u00e9ho probl\u00e9mu. Probl\u00e9m umo\u017e\u0148uje pre\u010d\u00edta\u0165 s\u00fabory v syst\u00e9me, v z\u00e1vislosti od pr\u00edstupov\u00fdch pr\u00e1v procesu, pod ktor\u00fdm sa vykon\u00e1va webov\u00e9 rozhranie. Napr\u00edklad na prezeranie s\u00faboru \/etc\/passwd mo\u017eno otvori\u0165 str\u00e1nku \u201ehttp:\/\/pagure.local:5000\/your-repository\/issue\/raw\/....\/....\/....\/....\/....\/....\/....\/etc\/passwd\u201c.\n<li class=\"l\"> Zranite\u013enos\u0165 (CVE-2024-47516) vo funkcii PagureRepo.log() poskytuje mo\u017enos\u0165 zasla\u0165 vlastn\u00e9 pr\u00edkazy a vykona\u0165 k\u00f3d na serveri. Probl\u00e9m je sp\u00f4soben\u00fd t\u00fdm, \u017ee pri prezeran\u00ed hist\u00f3rie zmien s\u00faboru cez webov\u00e9 rozhranie sa vyvol\u00e1 pr\u00edkaz \u201egit\u201c s predan\u00edm identifik\u00e1tora vetvy do pr\u00edkazov\u00e9ho riadka (napr\u00edklad \u201e\/usr\/bin\/git --pretty=oneline --abbrev-commit  -- README.md\u201c). Spr\u00e1vnos\u0165 identifik\u00e1tora sa nekontroluje, tak\u017ee namiesto neho mo\u017eno predlo\u017ei\u0165 ak\u00fako\u013evek vo\u013ebu pr\u00edkazov\u00e9ho riadka, napr\u00edklad \u201e--output=\/tmp\/foo.bar\u201c na presmerovanie v\u00fdstupu do s\u00faboru. \u00dato\u010dn\u00edk m\u00f4\u017ee prep\u00edsa\u0165 s\u00fabor v syst\u00e9me zaslan\u00edm po\u017eiadavky nasleduj\u00faceho druhu: http:\/\/pagure.local:5000\/test\/history\/README.md?identifier=--output=\/tmp\/foo.bar\n<p>Pagure be\u017e\u00ed pod pou\u017e\u00edvate\u013eom git, preto bude mo\u017en\u00e9 prep\u00edsa\u0165 len s\u00fabory tohto pou\u017e\u00edvate\u013ea. Na organiz\u00e1ciu vykon\u00e1vania vlastn\u00e9ho k\u00f3du na serveri mo\u017eno vyu\u017ei\u0165 slu\u017ebu na pr\u00edstup k repozit\u00e1ru cez SSH, pri \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u0438 ktorej sa spust\u00ed pr\u00edkaz \u201ebash -c \/usr\/libexec\/pagure\/aclchecker.py\u201c. \u00dato\u010dn\u00edk m\u00f4\u017ee vyu\u017ei\u0165 zranite\u013enos\u0165 na prep\u00edsanie s\u00faboru \u201e\/srv\/git\/.bashrc\u201c a tento s\u00fabor sa spust\u00ed pr\u00edkazov\u00fdm interpreterom bash pri pr\u00edstupe k repozit\u00e1ru cez ssh.      <\/p>\n<p>\u00datok spo\u010d\u00edva v registr\u00e1cii v syst\u00e9me Pagure, vytvoren\u00ed repozit\u00e1ra, prid\u00e1van\u00ed s\u00faboru README.md do repozit\u00e1ra s pozn\u00e1mkou k commitu vo forme \u201e|| \/bin\/bash\u201c a zaslan\u00ed po\u017eiadavky \u201ehttp:\/\/pagure.local:5000\/test\/history\/README.md?identifier=--output=\/srv\/git\/.bashrc\u201c. V priebehu t\u00fdchto krokov sa do s\u00faboru \u201e\/srv\/git\/.bashrc\u201c zap\u00ed\u0161e re\u0165azec vo forme \u201e34a5c43 || \/bin\/bash\u201c. Na spustenie vytvoren\u00e9ho s\u00faboru \u201e\/srv\/git\/.bashrc\u201c sta\u010d\u00ed pripoji\u0165 sa k repozit\u00e1ru cez SSH pod svoj\u00edm \u00fa\u010dtom. Vykon\u00e1vanie k\u00f3du s pr\u00e1vami pou\u017e\u00edvate\u013ea git na serveri Pagure umo\u017e\u0148uje kontrolova\u0165 cel\u00e9 obsahy repozit\u00e1rov s bal\u00edkmi.    <\/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>Na platforme OBS (Open Build Service), pou\u017e\u00edvan\u00e9 v openSUSE a niektor\u00fdch \u010fal\u0161\u00edch distrib\u00faci\u00e1ch na kompil\u00e1ciu bal\u00ed\u010dkov, bola odhalen\u00e1 jedna zranite\u013enos\u0165 (CVE-2024-22033), ktor\u00e1 umo\u017e\u0148uje vykona\u0165 vlastn\u00fd k\u00f3d na serveri. Zranite\u013enos\u0165 bola identifikovan\u00e1 27. j\u00fana 2024, nahl\u00e1sen\u00e1 projektu openSUSE 29. j\u00fana a odstr\u00e1nen\u00e1 10. j\u00fala.    <\/p>\n<p>Zranite\u013enos\u0165 existuje v slu\u017ebe &#171;obs-service-download_url&#187;, kde ch\u00fdbala spr\u00e1vna kontrola URL pou\u017e\u00edvan\u00e9ho pri spusten\u00ed utilitky wget zo skriptu, ktor\u00fd vykon\u00e1va s\u0165ahovanie zdrojov\u00e9ho k\u00f3du do OBS. \u00dato\u010dn\u00edk m\u00f4\u017ee v slu\u017ebe OBS zada\u0165 konfigur\u00e1ciu vytvoren\u00e9ho bal\u00edka, v ktorej namiesto URL na s\u0165ahovanie k\u00f3du bude zadan\u00e1 mo\u017enos\u0165 pr\u00edkazov\u00e9ho riadku pre wget, napr\u00edklad: &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> Na ob\u00eddenie vr\u00e1tenia chyby pri pokuse o spustenie wget bez URL je v pr\u00edklade uveden\u00e1 mo\u017enos\u0165 &#171;download-manifest&#187;, ktor\u00e1 umo\u017e\u0148uje zada\u0165 zoznam URL v samostatnom s\u00fabore. Uveden\u00fd pr\u00edklad povedie k vykonaniu pr\u00edkazu: \\\/usr\\\/bin\\\/wget -i \\\/srv\\\/obs\\\/service\\\/XXXXX\\\/src\\\/tempfile -4 &#8212;output-document=\\\/tmp\\\/test    <\/p>\n<p>ktor\u00e1 umo\u017e\u0148uje zap\u00edsa\u0165 do s\u00faboru \\\/tmp\\\/test obsah stiahnut\u00fd z odkazu uveden\u00e9ho v s\u00fabore \\\/srv\\\/obs\\\/service\\\/XXXXX\\\/src\\\/tempfile z k\u00f3du stiahnut\u00e9ho \u00fato\u010dn\u00edkom v OBS cez rozhranie build.opensuse.org, ktor\u00e9 umo\u017e\u0148uje vo\u013en\u00fa registr\u00e1ciu. Okrem prep\u00edsania s\u00faboru na serveri m\u00f4\u017ee \u00fato\u010dn\u00edk taktie\u017e posla\u0165 ak\u00fdko\u013evek s\u00fabor, ak namiesto &#171;&#8212;output-document&#187; uvedie mo\u017enos\u0165 &#171;&#8212;post-file&#187;, napr\u00edklad &#171;&#8212;post-file=\\\/etc\\\/passwd&#187;. T\u00fdmto sp\u00f4sobom m\u00f4\u017ee \u00fato\u010dn\u00edk \u010d\u00edta\u0165 a zapisova\u0165 s\u00fabory na serveri, pokia\u013e to povolenia, pod ktor\u00fdmi be\u017e\u00ed slu\u017eba OBS, dovolia.    <\/p>\n<p>Na premenenie mo\u017enosti z\u00e1pisu do s\u00faboru na vykon\u00e1vanie k\u00f3du na serveri v\u00fdskumn\u00edci navrhli met\u00f3du pozost\u00e1vaj\u00facu z dvoch krokov. Dva kroky s\u00fa potrebn\u00e9, preto\u017ee \u00fato\u010dn\u00edk m\u00f4\u017ee vytvori\u0165 s\u00fabor &#171;.wgetrc&#187; s nastaveniami pre wget, ale toto nesta\u010d\u00ed na spustenie pr\u00edkazov. Av\u0161ak, prostredn\u00edctvom &#171;.wgetrc&#187; je mo\u017en\u00e9 vytvori\u0165 podmienky na vykon\u00e1vanie akejko\u013evek programy v syst\u00e9me, ale bez prenosu argumentov. Na spustenie \u013eubovo\u013en\u00e9ho k\u00f3du sa navrhuje sp\u00fa\u0161\u0165a\u0165 program &#171;prove&#187;, ktor\u00fd spracov\u00e1va s\u00fabor konfigura\u010dn\u00e9ho s\u00faboru &#171;.proverc&#187;, ktor\u00fd umo\u017e\u0148uje uvies\u0165 mo\u017enos\u0165 &#171;&#8212;exec&#187; na vykonanie ak\u00e9hoko\u013evek k\u00f3du.     <\/p>\n<p>V prvej f\u00e1ze sa prostredn\u00edctvom vy\u0161\u0161ie uveden\u00fdch manipul\u00e1ci\u00ed s &#171;download-manifest&#187; v dom\u00e1cich adres\u00e1roch pou\u017e\u00edvate\u013ea &#171;obsservicerun&#187; vytvor\u00ed s\u00fabor &#171;.proverc&#187;, ktor\u00fd obsahuje pr\u00edkazy, ktor\u00e9 sa vykonaj\u00fa pri spusten\u00ed procesu &#171;prove&#187;. V druhej f\u00e1ze sa vytvor\u00ed s\u00fabor .wgetrc&#187; s parametrom &#171;use-askpass=\\\/usr\\\/bin\\\/prove&#187;, \u010do vedie k vyvolaniu &#171;prove&#187;. Po vzniku t\u00fdchto s\u00faborov sta\u010d\u00ed vytvori\u0165 podmienky pre s\u0165ahovanie ak\u00fdchko\u013evek d\u00e1t pomocou wget a to sp\u00f4sob\u00ed spustenie k\u00f3du \u00fato\u010dn\u00edka na serveri s pr\u00e1vami pou\u017e\u00edvate\u013ea &#171;obsservicerun&#187;. Pr\u00e1va pou\u017e\u00edvate\u013ea &#171;obsservicerun&#187; s\u00fa dostato\u010dn\u00e9 na z\u00edskanie k\u013e\u00fa\u010dov z repozit\u00e1rov, ktor\u00e9 pou\u017e\u00edvaj\u00fa pou\u017e\u00edvatelia OBS na certifik\u00e1ciu bal\u00edkov.     <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>Doplnok: T\u00edm SUSE Product Security sa domnieva, \u017ee nebezpe\u010denstvo zranite\u013enosti v OBS je precenen\u00e9 a vyhl\u00e1senie v\u00fdskumn\u00edkov, \u017ee probl\u00e9m umo\u017e\u0148uje skompromitova\u0165 v\u0161etky bal\u00edky v distrib\u00facii openSUSE, neodpoved\u00e1 realite. Uv\u00e1dza sa, \u017ee slu\u017eby v infra\u0161trukt\u00fare build.opensuse.org sa sp\u00fa\u0161\u0165aj\u00fa s pou\u017eit\u00edm izolovan\u00fdch kontajnerov, ktor\u00e9 s\u00fa znovu vytv\u00e1ran\u00e9 a neobsahuj\u00fa kritick\u00e9 inform\u00e1cie. Zisten\u00e1 zranite\u013enos\u0165 je hodnoten\u00e1 ako nebezpe\u010dn\u00e1, av\u0161ak nedostato\u010dn\u00e1 na kompromit\u00e1ciu build infra\u0161trukt\u00fary openSUSE a vytv\u00e1ran\u00fdch bal\u00edkov. Okrem toho sa uv\u00e1dza, \u017ee akcie v rozhran\u00ed OBS, pop\u00edsan\u00e9 v pr\u00edklade \u00fatoku, mohli by\u0165 vykonan\u00e9 iba v pr\u00edpade OBS nain\u0161talovan\u00e9ho lok\u00e1lne na pracovnej stanici v\u00fdvoj\u00e1ra.<br \/>\n<br \/>Zdroj: <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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