{"id":32892,"date":"2019-10-31T21:49:35","date_gmt":"2019-10-31T18:49:35","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-v-yadre-linux-pozvolyayushhaya-vyzvat-krah-cherez-otpravku-udp-paketa\/"},"modified":"2019-10-31T21:49:35","modified_gmt":"2019-10-31T18:49:35","slug":"uyazvimost-v-yadre-linux-pozvolyayushhaya-vyzvat-krah-cherez-otpravku-udp-paketa","status":"publish","type":"post","link":"https:\/\/prohoster.info\/de\/blog\/news\/uyazvimost-v-yadre-linux-pozvolyayushhaya-vyzvat-krah-cherez-otpravku-udp-paketa","title":{"rendered":"Eine Schwachstelle im Linux-Kernel, die einen Absturz durch das Senden eines UDP-Pakets verursachen kann","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Im Linux-Kernel <noindex><a rel=\"nofollow\" href=\"https:\/\/seclists.org\/oss-sec\/2019\/q2\/86\">entdeckt<\/a><\/noindex> Schwachstelle (<noindex><a rel=\"nofollow\" href=\"https:\/\/security-tracker.debian.org\/tracker\/CVE-2019-11683\">CVE-2019-11683<\/a><\/noindex>), die es erm\u00f6glicht, einen Denial-of-Service aus der Ferne durch das Senden speziell gestalteter UDP-Pakete (packet-of-death) auszul\u00f6sen. Das Problem wird durch einen Fehler im Handler udp_gro_receive_segment (net\/ipv4\/udp_offload.c) in der Implementierung der Technologie GRO (Generic Receive Offload) verursacht und kann zu einer Besch\u00e4digung des Inhalts von Kernel-Speicherbereichen beim Umgang mit UDP-Paketen mit null-F\u00fcllung (leerer Payload) f\u00fchren.<\/p>\n<p>Das Problem betrifft nur den Kernel <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50201\">5.0<\/a><\/noindex>, da die Unterst\u00fctzung von GRO f\u00fcr UDP-Sockets <noindex><a rel=\"nofollow\" href=\"https:\/\/git.kernel.org\/pub\/scm\/linux\/kernel\/git\/torvalds\/linux.git\/commit\/?id=e20cf8d3f1f7\">wurde<\/a><\/noindex> im November letzten Jahres eingef\u00fchrt wurde und nur in das letzte stabile Release des Kernels aufgenommen wurde. Die Technologie GRO erm\u00f6glicht eine schnellere Verarbeitung einer gro\u00dfen Anzahl von eingehenden Paketen, indem mehrere Pakete in gr\u00f6\u00dfere Bl\u00f6cke aggregiert werden, die keine separate Verarbeitung jedes Pakets erfordern.<br \/>\nF\u00fcr TCP tritt das Problem nicht auf, da f\u00fcr dieses Protokoll keine Paketaggregation ohne Payload unterst\u00fctzt wird.<\/p>\n<p>Die Schwachstelle wurde bisher nur in Form von <noindex><a rel=\"nofollow\" href=\"https:\/\/git.kernel.org\/pub\/scm\/linux\/kernel\/git\/torvalds\/linux.git\/commit\/?id=4dd2b82d5adfbe0b1587ccad7a8f76d826120f37\">Patches<\/a><\/noindex>, einem fixierenden Update, ver\u00f6ffentlicht (in das gestrige Update 5.0.11 wurde der Fix <noindex><a rel=\"nofollow\" href=\"https:\/\/cdn.kernel.org\/pub\/linux\/kernel\/v5.x\/ChangeLog-5.0.11\">nicht aufgenommen<\/a><\/noindex>). Im Distributionen ist der Kernel 5.0 Teil von <noindex><a rel=\"nofollow\" href=\"https:\/\/bodhi.fedoraproject.org\/updates\/?releases=F30&#038;type=security\">Fedora 30<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/people.canonical.com\/~ubuntu-security\/cve\/2019\/CVE-2019-11683.html\">Ubuntu 19.04<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.archlinux.org\/packages\/core\/x86_64\/linux\/\">Arch Linux<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/packages.gentoo.org\/packages\/sys-kernel\/gentoo-sources\">Gentoo<\/a><\/noindex> und anderen kontinuierlich aktualisierten Distributionen. <noindex><a rel=\"nofollow\" href=\"https:\/\/security-tracker.debian.org\/tracker\/CVE-2019-11683\">Debian<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/people.canonical.com\/~ubuntu-security\/cve\/2019\/CVE-2019-11683.html\">Ubuntu 18.10 und \u00e4lter<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/bugzilla.redhat.com\/show_bug.cgi?id=CVE-2019-11683\">RHEL\/CentOS<\/a><\/noindex> und <noindex><a rel=\"nofollow\" href=\"https:\/\/bugzilla.novell.com\/show_bug.cgi?id=CVE-2019-11683\">SUSE\\\/openSUSE<\/a><\/noindex> sind nicht betroffen.<\/p>\n<p>Das Problem wurde durch <noindex><a rel=\"nofollow\" href=\"https:\/\/syzkaller.appspot.com\/upstream\">die Nutzung<\/a><\/noindex> des automatisierten Fuzzing-Testsystems der Firma Google <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/google\/syzkaller\/blob\/master\/docs\/syzbot.md\">syzbot<\/a><\/noindex> und des Analysewerkzeugs  <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/google\/kasan\/wiki\">KASAN<\/a><\/noindex> (KernelAddressSanitizer), das darauf abzielt, Fehler im Umgang mit Speicher und fehlerhafte Speicherzugriffe zu identifizieren, wie z.B. Zugriffe auf freigegebene Speicherbereiche und das Platzieren von Code in Speicherbereichen, die nicht f\u00fcr solche Manipulationen vorgesehen sind. <\/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=50620\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2019-11683), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u043e\u0442\u043a\u0430\u0437 \u0432 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u0438 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 UDP-\u043f\u0430\u043a\u0435\u0442\u043e\u0432 (packet-of-death). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0448\u0438\u0431\u043a\u043e\u0439 \u0432 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0435 udp_gro_receive_segment (net\/ipv4\/udp_offload.c) \u0441 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 GRO (Generic Receive \u041effload) \u0438 \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043f\u043e\u0432\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u044e \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u043e\u0431\u043b\u0430\u0441\u0442\u0435\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 \u044f\u0434\u0440\u0430 \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 UDP-\u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0441 \u043d\u0443\u043b\u0435\u0432\u044b\u043c \u0437\u0430\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435\u043c (\u043f\u0443\u0441\u0442\u043e\u0439 payload). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u0442\u043e\u043b\u044c\u043a\u043e \u044f\u0434\u0440\u043e 5.0, \u0442\u0430\u043a [&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-32892","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=\"\u0412 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