{"id":78706,"date":"2020-04-21T13:42:05","date_gmt":"2020-04-21T11:42:05","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/obnovlenie-git-s-ustraneniem-eshhyo-odnoj-uyazvimosti"},"modified":"2020-04-21T13:42:05","modified_gmt":"2020-04-21T11:42:05","slug":"obnovlenie-git-s-ustraneniem-eshhyo-odnoj-uyazvimosti","status":"publish","type":"post","link":"https:\/\/prohoster.info\/de\/blog\/news\/obnovlenie-git-s-ustraneniem-eshhyo-odnoj-uyazvimosti","title":{"rendered":"Git-Update zur Behebung einer weiteren Schwachstelle","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/lkml.org\/lkml\/2020\/4\/20\/1252\">Ver\u00f6ffentlicht<\/a><\/noindex> korrigierte Versionen des verteilten Textverwaltungssystems Git 2.26.2, 2.25.4, 2.24.3, 2.23.3, 2.22.4, 2.21.3, 2.20.4, 2.19.5, 2.18.4 und 2.17.5, in denen <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/git\/git\/security\/advisories\/GHSA-hjc9-x69f-jqj7\">eine Schwachstelle<\/a><\/noindex> (<noindex><a rel=\"nofollow\" href=\"https:\/\/security-tracker.debian.org\/tracker\/CVE-2020-11008\">CVE-2020-11008<\/a><\/noindex>), \u00e4hnlich <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52734\">das Problem<\/a><\/noindex>, die letzte Woche behoben wurde. Die neue Schwachstelle betrifft auch die Handler &#171;credential.helper&#187; und wird ausgenutzt, wenn ein speziell formatierter URL \u00fcbergeben wird, der ein Zeilenumbruchzeichen, einen leeren Host oder ein nicht angegebenes Anfrageprotokoll enth\u00e4lt. Bei der Verarbeitung eines solchen URL sendet credential.helper Anmeldeinformationen, die nicht mit dem angeforderten Protokoll oder Host \u00fcbereinstimmen, auf den zugegriffen wird.<\/p>\n<p>Im Gegensatz zum vorherigen Problem kann der Angreifer bei der Ausnutzung der neuen Schwachstelle den Host, von dem die fremden Anmeldeinformationen \u00fcbermittelt werden, nicht direkt kontrollieren. Welche Anmeldeinformationen geleakt werden, h\u00e4ngt von der Art der Verarbeitung des fehlenden Parameters &#171;host&#187; in credential.helper ab. Das Kernproblem besteht darin, dass leere Felder in URLs von vielen credential.helper-Handlern als Anweisung interpretiert werden, beliebige Anmeldeinformationen auf die aktuelle Anfrage anzuwenden. So kann credential.helper Anmeldeinformationen, die f\u00fcr einen anderen Server gespeichert sind, an den im URL angegebenen Server des Angreifers senden. <\/p>\n<p>Das Problem zeigt sich bei der Ausf\u00fchrung von Operationen wie &#171;git clone&#187; und &#171;git fetch&#187;, ist aber am gef\u00e4hrlichsten bei der Verarbeitung von Submodulen \u2014 bei der Ausf\u00fchrung von &#171;git submodule update&#187; werden URLs, die in der Datei .gitmodules im Repository angegeben sind, automatisch verarbeitet. Als Workaround zur Blockierung des Problems <noindex><a rel=\"nofollow\" href=\"https:\/\/github.blog\/2020-04-20-git-credential-helper-vulnerability-announced-update\/\">wird empfohlen<\/a><\/noindex> credential.helper beim Zugriff auf \u00f6ffentliche Repositories nicht zu verwenden und &#171;git clone&#187; im &#171;&#8212;recurse-submodules&#187; Modus mit nicht verifiziertem Repository nicht anzuwenden. <\/p>\n<p>Die in den neuen Git-Versionen vorgeschlagene <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/git\/git\/compare\/v2.17.4...v2.17.5\">Korrektur<\/a><\/noindex> verhindert den Aufruf von credential.helper f\u00fcr URLs, die <noindex><a rel=\"nofollow\" href=\"https:\/\/git.kernel.org\/pub\/scm\/git\/git.git\/commit\/?id=fe29a9b7b0236d3d45c254965580d6aff7fa8504\">nicht darstellbare Werte<\/a><\/noindex> enthalten (zum Beispiel bei Verwendung von drei Slashes anstelle von zwei &#8212; &#171;http:\/\/\/host&#187; oder ohne Protokollschema &#8212; &#171;http::ftp.example.com\/&#187;). Das Problem betrifft die Handler store (integrierter Credential-Store von Git), cache (integrierter Cache f\u00fcr eingegebene Anmeldeinformationen) und osxkeychain (Speicher f\u00fcr macOS). Der Git Credential Manager (Speicher f\u00fcr Windows) ist von dieser Schwachstelle nicht betroffen.<\/p>\n<p>Die Ver\u00f6ffentlichung von Paketupdates in Distributionen kann auf den Seiten verfolgt werden <noindex><a rel=\"nofollow\" href=\"https:\/\/security-tracker.debian.org\/tracker\/CVE-2020-11008\">Debian<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/people.canonical.com\/~ubuntu-security\/cve\/2020\/CVE-2020-11008.html\">Ubuntu<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/bugzilla.redhat.com\/show_bug.cgi?id=CVE-2020-11008\">RHEL<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/bugzilla.suse.com\/show_bug.cgi?id=CVE-2020-11008\">SUSE\\\/openSUSE<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/bodhi.fedoraproject.org\/updates\/?releases=F31&#038;type=security\">Fedora<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/security.archlinux.org\/CVE-2020-11008\">Arch<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"http:\/\/packages.altlinux.org\/git\">ALT<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"http:\/\/www.vuxml.org\/freebsd\/\">FreeBSD<\/a><\/noindex>.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Quelle: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52774\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u043c\u0438 \u0442\u0435\u043a\u0441\u0442\u0430\u043c\u0438 Git 2.26.2, 2.25.4, 2.24.3, 2.23.3, 2.22.4, 2.21.3, 2.20.4, 2.19.5, 2.18.4 \u0438 2.17.5, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-11008), \u043d\u0430\u043f\u043e\u043c\u0438\u043d\u0430\u044e\u0449\u0430\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0443, \u0443\u0441\u0442\u0440\u0430\u043d\u0451\u043d\u043d\u0443\u044e \u043d\u0430 \u043f\u0440\u043e\u0448\u043b\u043e\u0439 \u043d\u0435\u0434\u0435\u043b\u0435. \u041d\u043e\u0432\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0442\u0430\u043a\u0436\u0435 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 &#171;credential.helper&#187; \u0438 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u043f\u0440\u0438 \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e URL, \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u0449\u0435\u0433\u043e \u0441\u0438\u043c\u0432\u043e\u043b \u043d\u043e\u0432\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0438, \u043f\u0443\u0441\u0442\u043e\u0439 \u0445\u043e\u0441\u0442 \u0438\u043b\u0438 \u043d\u0435 \u0443\u043a\u0430\u0437\u0430\u043d\u043d\u0443\u044e \u0441\u0445\u0435\u043c\u0443 \u0437\u0430\u043f\u0440\u043e\u0441\u0430. [&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-78706","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u043c\u0438 \u0442\u0435\u043a\u0441\u0442\u0430\u043c\u0438 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