{"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\/cs\/blog\/news\/uyazvimosti-v-pagure-i-obs-dopuskavshie-komprometacziyu-paketov-v-repozitoriyah-fedora-i-opensuse","title":{"rendered":"Zranitelnosti v Pagure a OBS, kter\u00e9 umo\u017enily kompromitaci bal\u00edk\u016f v repozit\u00e1\u0159\u00edch Fedora a openSUSE.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Bezpe\u010dnostn\u00ed v\u00fdzkumn\u00edci z firmy Fenrisk odhalili zranitelnosti v n\u00e1stroj\u00edch Pagure a OBS (Open Build Service), kter\u00e9 umo\u017enily kompromitaci infrastruktury pro vytv\u00e1\u0159en\u00ed bal\u00ed\u010dk\u016f distribuc\u00ed Fedora a openSUSE. V\u00fdzkumn\u00edci demonstrovali schopnost prov\u00e9st \u00fatok pro vykon\u00e1n\u00ed libovoln\u00e9ho k\u00f3du na serverech s Pagure a OBS, co\u017e by mohlo b\u00fdt pou\u017eito k nahrazen\u00ed zm\u011bn v bal\u00ed\u010dc\u00edch v repozit\u00e1\u0159\u00edch Fedora a openSUSE.     <\/p>\n<p>V platform\u011b Pagure, pou\u017e\u00edvan\u00e9 v Fedo\u0159e pro spolupr\u00e1ci s k\u00f3dem a metadaty bal\u00ed\u010dk\u016f, byly odhaleny 4 zranitelnosti. K vyu\u017eit\u00ed t\u011bchto probl\u00e9m\u016f je pot\u0159eba m\u00edt \u00fa\u010det na slu\u017eb\u011b Pagure, kter\u00fd si m\u016f\u017ee vytvo\u0159it kdokoliv (v sou\u010dasnosti je na Pagure.io registrov\u00e1no 24899 u\u017eivatel\u016f). T\u0159i probl\u00e9my umo\u017e\u0148uj\u00ed \u010dten\u00ed soubor\u016f v syst\u00e9mu a jeden probl\u00e9m vykon\u00e1n\u00ed vlastn\u00edho k\u00f3du na <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/server\/dts-newyork\/\"   title=\"serveru\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2806\">serveru<\/a>. Probl\u00e9my byly odhaleny 1. ledna 2024, ozn\u00e1meny prost\u0159ednictv\u00edm bugzilla.redhat.com 25. dubna 2024 a opraveny v Pagure b\u011bhem 3 hodin.    <\/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 v funkc\u00edch aktualizace soubor\u016f a generov\u00e1n\u00ed archiv\u016f. Zranitelnosti umo\u017e\u0148uj\u00ed \u010d\u00edst obsah lok\u00e1ln\u00edch soubor\u016f na serveru, nap\u0159\u00edklad je mo\u017en\u00e9 zjistit obsah souboru s parametry sezen\u00ed administr\u00e1tora Pagure a z\u00edskat p\u0159\u00edstup s jeho pr\u00e1vy. Vyu\u017eit\u00ed zranitelnosti v 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; otev\u0159en\u00ed tohoto souboru pro \u00fapravy v webov\u00e9m rozhran\u00ed.\n<li class=\"l\"> Zranitelnost (CVE-2024-4982) ve funkci view_issue_raw_file() umo\u017e\u0148uje p\u0159ekro\u010dit z\u00e1kladn\u00ed adres\u00e1\u0159 pomoc\u00ed zad\u00e1n\u00ed znak\u016f &#171; \/.. &#187; v parametrech po\u017eadovan\u00e9ho Issues. Tento probl\u00e9m umo\u017e\u0148uje p\u0159e\u010d\u00edst soubory v syst\u00e9mu podle opr\u00e1vn\u011bn\u00ed procesu, pod kter\u00fdm b\u011b\u017e\u00ed webov\u00e9 rozhran\u00ed. Nap\u0159\u00edklad pro zobrazen\u00ed souboru \/etc\/passwd lze otev\u0159\u00edt str\u00e1nku &#171; http:\/\/pagure.local:5000\/your-repository\/issue\/raw\/....\/....\/....\/....\/....\/....\/....\/etc\/passwd &#187;.\n<li class=\"l\"> Zranitelnost (CVE-2024-47516) ve funkci PagureRepo.log() umo\u017e\u0148uje proveden\u00ed vlastn\u00edch p\u0159\u00edkaz\u016f a spu\u0161t\u011bn\u00ed k\u00f3du na serveru. Tento probl\u00e9m vznik\u00e1, proto\u017ee p\u0159i prohl\u00ed\u017een\u00ed historie zm\u011bn souboru p\u0159es webov\u00e9 rozhran\u00ed se spou\u0161t\u00ed p\u0159\u00edkaz &#171; git &#187; s p\u0159ed\u00e1n\u00edm identifik\u00e1toru v\u011btve v p\u0159\u00edkazov\u00e9m \u0159\u00e1dku (nap\u0159\u00edklad &#171; \/usr\/bin\/git --pretty=oneline --abbrev-commit  -- README.md &#187;). Spr\u00e1vnost identifik\u00e1toru nen\u00ed kontrolov\u00e1na, tak\u017ee lze m\u00edsto n\u011bj poskytnout jakoukoli volbu p\u0159\u00edkazov\u00e9ho \u0159\u00e1dku, nap\u0159\u00edklad &#171; --output=\/tmp\/foo.bar &#187; pro p\u0159esm\u011brov\u00e1n\u00ed v\u00fdstupu do souboru. \u00dato\u010dn\u00edk m\u016f\u017ee p\u0159epsat soubor v syst\u00e9mu zasl\u00e1n\u00edm \u017e\u00e1dosti n\u00e1sleduj\u00edc\u00edho typu: http:\/\/pagure.local:5000\/test\/history\/README.md?identifier=--output=\/tmp\/foo.bar\n<p>Pagure b\u011b\u017e\u00ed pod u\u017eivatelsk\u00fdm \u00fa\u010dtem git, a proto lze p\u0159epsat pouze soubory tohoto u\u017eivatele. Pro zaji\u0161t\u011bn\u00ed spu\u0161t\u011bn\u00ed vlastn\u00edho k\u00f3du na serveru lze vyu\u017e\u00edt slu\u017ebu pro p\u0159\u00edstup k repozit\u00e1\u0159i p\u0159es SSH, p\u0159i \u010dem\u017e se spou\u0161t\u00ed p\u0159\u00edkaz &#171; bash -c \/usr\/libexec\/pagure\/aclchecker.py &#187;. \u00dato\u010dn\u00edk m\u016f\u017ee vyu\u017e\u00edt zranitelnost k p\u0159eps\u00e1n\u00ed souboru &#171; \/srv\/git\/.bashrc &#187; a tento soubor bude spu\u0161t\u011bn interpretem bash p\u0159i p\u0159\u00edstupu k repozit\u00e1\u0159i p\u0159es SSH.      <\/p>\n<p>\u00datok spo\u010d\u00edv\u00e1 v registraci do syst\u00e9mu Pagure, vytvo\u0159en\u00ed repozit\u00e1\u0159e, p\u0159id\u00e1n\u00ed souboru README.md do repozit\u00e1\u0159e s pozn\u00e1mkou k commitu ve form\u00e1tu &#171; || \/bin\/bash &#187; a odesl\u00e1n\u00ed \u017e\u00e1dosti &#171; http:\/\/pagure.local:5000\/test\/history\/README.md?identifier=--output=\/srv\/git\/.bashrc &#187;. B\u011bhem t\u011bchto krok\u016f bude do souboru &#171; \/srv\/git\/.bashrc &#187; zaps\u00e1n \u0159et\u011bzec ve form\u00e1tu &#171; 34\u04305\u044143 || \/bin\/bash &#187;. Pro spu\u0161t\u011bn\u00ed vytvo\u0159en\u00e9ho souboru &#171; \/srv\/git\/.bashrc &#187; sta\u010d\u00ed p\u0159ipojit se k repozit\u00e1\u0159i p\u0159es SSH pod sv\u00fdm u\u017eivatelsk\u00fdm \u00fa\u010dtem. Spu\u0161t\u011bn\u00ed k\u00f3du s pr\u00e1vy u\u017eivatele git na serveru Pagure umo\u017e\u0148uje kontrolovat ve\u0161ker\u00fd obsah repozit\u00e1\u0159\u016f s bal\u00ed\u010dky.    <\/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 platform\u011b OBS (Open Build Service), pou\u017e\u00edvan\u00e9 v openSUSE a n\u011bkter\u00fdch dal\u0161\u00edch distribuc\u00edch pro sestavov\u00e1n\u00ed bal\u00ed\u010dk\u016f, byla odhalena jedna zranitelnost (CVE-2024-22033), kter\u00e1 umo\u017e\u0148uje vykonat vlastn\u00ed k\u00f3d na serveru. Zranitelnost byla identifikov\u00e1na 27. \u010dervna 2024, projekt openSUSE byl informov\u00e1n 29. \u010dervna a oprava byla provedena 10. \u010dervence.    <\/p>\n<p>Zranitelnost se vyskytuje ve slu\u017eb\u011b &#171;obs-service-download_url&#187;, kter\u00e1 nem\u011bla odpov\u00eddaj\u00edc\u00ed kontrolu URL pou\u017e\u00edvan\u00e9ho p\u0159i spu\u0161t\u011bn\u00ed n\u00e1stroje wget ve skriptu, jen\u017e prov\u00e1d\u00ed stahov\u00e1n\u00ed zdrojov\u00e9ho k\u00f3du do OBS. \u00dato\u010dn\u00edk m\u016f\u017ee v slu\u017eb\u011b OBS definovat konfiguraci vytv\u00e1\u0159en\u00e9ho bal\u00ed\u010dku, ve kter\u00e9 m\u00edsto URL pro sta\u017een\u00ed k\u00f3du bude uvedena volba p\u0159\u00edkazov\u00e9ho \u0159\u00e1dku pro wget, nap\u0159\u00edklad:            &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> Pro obch\u00e1zen\u00ed n\u00e1vratu chyby p\u0159i pokusu o spu\u0161t\u011bn\u00ed wget bez URL je uvedena volba &#171;download-manifest&#187;, kter\u00e1 umo\u017e\u0148uje specifikovat seznam URL v samostatn\u00e9m souboru. V\u00fd\u0161e uveden\u00fd p\u0159\u00edklad povede ke spu\u0161t\u011bn\u00ed p\u0159\u00edkazu:       \\\/usr\\\/bin\\\/wget -i \\\/srv\\\/obs\\\/service\\\/XXXXX\\\/src\\\/tempfile -4 &#8212;output-document=\\\/tmp\\\/test    <\/p>\n<p>kter\u00fd umo\u017e\u0148uje zapsat do souboru \\\/tmp\\\/test obsah sta\u017een\u00fd podle odkazu uveden\u00e9ho v souboru \\\/srv\\\/obs\\\/service\\\/XXXXX\\\/src\\\/tempfile z k\u00f3du, kter\u00fd \u00fato\u010dn\u00edk nahr\u00e1l do OBS prost\u0159ednictv\u00edm rozhran\u00ed build.opensuse.org, kter\u00e9 umo\u017e\u0148uje volnou registraci. Krom\u011b p\u0159eps\u00e1n\u00ed souboru na serveru m\u016f\u017ee \u00fato\u010dn\u00edk tak\u00e9 poslat jak\u00fdkoliv soubor sob\u011b, pokud jako &#171;&#8212;output-document&#187; uvede volbu &#171;&#8212;post-file&#187;, nap\u0159\u00edklad &#171;&#8212;post-file=\\\/etc\\\/passwd&#187;. Takto m\u016f\u017ee \u00fato\u010dn\u00edk \u010d\u00edst a zapisovat soubory na serveru, jak dovoluj\u00ed p\u0159\u00edstupov\u00e1 pr\u00e1va, pod nimi\u017e je slu\u017eba OBS spu\u0161t\u011bna.    <\/p>\n<p>Aby bylo mo\u017en\u00e9 p\u0159ev\u00e9st mo\u017enost z\u00e1pisu do souboru na vykon\u00e1n\u00ed k\u00f3du na serveru, navrhli v\u00fdzkumn\u00edci metodu slo\u017eenou ze dvou f\u00e1z\u00ed. Dv\u011b f\u00e1ze jsou nezbytn\u00e9, proto\u017ee \u00fato\u010dn\u00edk m\u016f\u017ee vytvo\u0159it soubor &#171;.wgetrc&#187; s nastaven\u00edm k wget, ale to nesta\u010d\u00ed pro spu\u0161t\u011bn\u00ed p\u0159\u00edkaz\u016f. P\u0159es &#171;.wgetrc&#187; lze v\u0161ak vytvo\u0159it podm\u00ednky pro vykon\u00e1n\u00ed jak\u00e9koliv programu v syst\u00e9mu, ale bez p\u0159ed\u00e1v\u00e1n\u00ed jej\u00edch argument\u016f. Pro spu\u0161t\u011bn\u00ed libovoln\u00e9ho k\u00f3du bylo navr\u017eeno spustit program &#171;prove&#187;, kter\u00fd zpracov\u00e1v\u00e1 konfigura\u010dn\u00ed soubor &#171;.proverc&#187;, umo\u017e\u0148uj\u00edc\u00ed specifikaci volby &#171;&#8212;exec&#187; pro vykon\u00e1n\u00ed jak\u00e9hokoliv k\u00f3du.     <\/p>\n<p>V prvn\u00edm kroku pomoc\u00ed v\u00fd\u0161e uveden\u00fdch manipulac\u00ed s &lt;download-manifest&gt; v dom\u00e1c\u00edm katalogu u\u017eivatele &lt;obsservicerun&gt; se vytvo\u0159\u00ed soubor &lt;.proverc&gt;, kter\u00fd obsahuje p\u0159\u00edkazy, kter\u00e9 budou vykon\u00e1ny p\u0159i spu\u0161t\u011bn\u00ed procesu &lt;prove&gt;. Ve druh\u00e9m kroku se vytvo\u0159\u00ed soubor &lt;.wgetrc&gt; s parametrem &lt;use-askpass=\\\/usr\\\/bin\\\/prove&gt;, kter\u00fd m\u00e1 za n\u00e1sledky vyvol\u00e1n\u00ed &lt;prove&gt;. Po vzniku t\u011bchto soubor\u016f sta\u010d\u00ed vytvo\u0159it podm\u00ednky pro sta\u017een\u00ed jak\u00fdchkoliv dat pomoc\u00ed wget, co\u017e spust\u00ed k\u00f3d \u00fato\u010dn\u00edka na serveru s pr\u00e1vy u\u017eivatele &lt;obsservicerun&gt;. Pr\u00e1va u\u017eivatele &lt;obsservicerun&gt; jsou dostate\u010dn\u00e1 k z\u00edsk\u00e1n\u00ed kl\u00ed\u010d\u016f z repozit\u00e1\u0159\u016f, kter\u00e9 u\u017eivatel\u00e9 OBS pou\u017e\u00edvaj\u00ed k podepisov\u00e1n\u00ed bal\u00ed\u010dk\u016f.     <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>Dopl\u0148uj\u00edc\u00ed informace: T\u00fdm SUSE Product Security se domn\u00edv\u00e1, \u017ee nebezpe\u010d\u00ed zranitelnosti v OBS je p\u0159ece\u0148ov\u00e1no a prohl\u00e1\u0161en\u00ed v\u00fdzkumn\u00edk\u016f, \u017ee probl\u00e9m umo\u017e\u0148uje kompromitaci v\u0161ech bal\u00ed\u010dk\u016f v distribuci openSUSE, nen\u00ed pravdiv\u00e9. Je zd\u016frazn\u011bno, \u017ee slu\u017eby v infrastruktu\u0159e build.opensuse.org b\u011b\u017e\u00ed v izolovan\u00fdch kontejnerech, kter\u00e9 jsou znovu vytv\u00e1\u0159eny a neobsahuj\u00ed citliv\u00e9 informace. Zji\u0161t\u011bn\u00e1 zranitelnost je hodnocena jako nebezpe\u010dn\u00e1, ale nedostate\u010dn\u00e1 pro kompromitaci stavebn\u00ed infrastruktury openSUSE a vytv\u00e1\u0159en\u00fdch bal\u00ed\u010dk\u016f. D\u00e1le bylo uvedeno, \u017ee akce v rozhran\u00ed OBS, popsan\u00e9 v p\u0159\u00edkladu \u00fatoku, mohly b\u00fdt provedeny pouze v instancech OBS, kter\u00e9 byly lok\u00e1ln\u011b nainstalov\u00e1ny na pracovn\u00ed stanici v\u00fdvoj\u00e1\u0159e.<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. 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