{"id":53889,"date":"2019-12-12T00:00:00","date_gmt":"2019-12-11T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/uyazvimost-v-ld-so-openbsd"},"modified":"2020-02-18T14:01:50","modified_gmt":"2020-02-18T11:01:50","slug":"uyazvimost-v-ld-so-openbsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/de\/blog\/novosti-interneta\/uyazvimost-v-ld-so-openbsd","title":{"rendered":"Sicherheitsanf\u00e4lligkeit in ld.so OpenBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Dynamischer Loader <noindex><a rel=\"nofollow\" href=\"http:\/\/man.openbsd.org\/OpenBSD-6.6\/ld.so.1\">ld.so<\/a><\/noindex>, das in OpenBSD enthalten ist, kann unter bestimmten Bedingungen f\u00fcr <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Suid\">SUID\/SGID<\/a><\/noindex>-Anwendungen die Umgebungsvariable LD_LIBRARY_PATH belassen und somit das Laden von Drittanbieter-Code im Kontext eines mit erh\u00f6hten Rechten laufenden Prozesses erm\u00f6glichen. Patches zur Behebung der Schwachstelle sind f\u00fcr die Releases verf\u00fcgbar. <noindex><a rel=\"nofollow\" href=\"https:\/\/ftp.openbsd.org\/pub\/OpenBSD\/patches\/6.5\/common\/024_ldso.patch.sig\">6.5<\/a><\/noindex> und <noindex><a rel=\"nofollow\" href=\"https:\/\/ftp.openbsd.org\/pub\/OpenBSD\/patches\/6.6\/common\/013_ldso.patch.sig\">6.6<\/a><\/noindex>. Bin\u00e4r-Patches (<noindex><a rel=\"nofollow\" href=\"http:\/\/man.openbsd.org\/OpenBSD-6.6\/syspatch.8\">syspatch<\/a><\/noindex>) f\u00fcr die Plattformen amd64, i386 und arm64 sind bereits in Produktion und sollten zum Zeitpunkt der Ver\u00f6ffentlichung dieser Nachricht verf\u00fcgbar sein.<\/p>\n<p>\u0421\u0443\u0442\u044c \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b: \u0432 \u0445\u043e\u0434\u0435 \u0440\u0430\u0431\u043e\u0442\u044b ld.so \u0441\u043d\u0430\u0447\u0430\u043b\u0430 \u0438\u0437\u0432\u043b\u0435\u043a\u0430\u0435\u0442 \u0438\u0437 \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439 LD_LIBRARY_PATH, \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u0444\u0443\u043d\u043a\u0446\u0438\u0438 _dl_split_path() \u043f\u0440\u0435\u0432\u0440\u0430\u0449\u0430\u0435\u0442 \u0435\u0433\u043e \u0432 \u043c\u0430\u0441\u0441\u0438\u0432 \u0441\u0442\u0440\u043e\u043a &#8212; \u043f\u0443\u0442\u0435\u0439 \u043a \u043a\u0430\u0442\u0430\u043b\u043e\u0433\u0430\u043c. \u0415\u0441\u043b\u0438 \u043f\u043e\u0437\u0434\u043d\u0435\u0435 \u0432\u044b\u044f\u0441\u043d\u044f\u0435\u0442\u0441\u044f, \u0447\u0442\u043e \u0442\u0435\u043a\u0443\u0449\u0438\u0439 \u043f\u0440\u043e\u0446\u0435\u0441\u0441 \u0437\u0430\u043f\u0443\u0449\u0435\u043d SUID\/SGID-\u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0435\u043c, \u0442\u043e \u0441\u043e\u0437\u0434\u0430\u043d\u043d\u044b\u0439 \u043c\u0430\u0441\u0441\u0438\u0432 \u0438, \u0441\u043e\u0431\u0441\u0442\u0432\u0435\u043d\u043d\u043e, \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f LD_LIBRARY_PATH \u043e\u0447\u0438\u0449\u0430\u044e\u0442\u0441\u044f. \u041f\u0440\u0438 \u044d\u0442\u043e\u043c, \u0435\u0441\u043b\u0438 \u0432 \u0445\u043e\u0434\u0435 \u0440\u0430\u0431\u043e\u0442\u044b _dl_split_path() \u0441\u0442\u043e\u043b\u043a\u043d\u0451\u0442\u0441\u044f \u0441 \u043d\u0435\u0445\u0432\u0430\u0442\u043a\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 (\u0447\u0442\u043e \u0442\u0440\u0443\u0434\u043d\u043e \u0438\u0437-\u0437\u0430 \u043d\u0430\u043b\u0438\u0447\u0438\u044f \u044f\u0432\u043d\u043e\u0433\u043e \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u044f \u043d\u0430 \u0440\u0430\u0437\u043c\u0435\u0440 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445 \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f \u0432 256 \u043a\u0411\u0430\u0439\u0442, \u043d\u043e \u0442\u0435\u043e\u0440\u0435\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e), \u0442\u043e \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f _dl_libpath \u043f\u043e\u043b\u0443\u0447\u0438\u0442 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 NULL, \u0438 \u043f\u043e\u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0430\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u044d\u0442\u043e\u0439 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439 \u0437\u0430\u0441\u0442\u0430\u0432\u0438\u0442 \u043f\u0440\u043e\u043f\u0443\u0441\u0442\u0438\u0442\u044c \u0432\u044b\u0437\u043e\u0432 _dl_unsetenv(&#171;LD_LIBRARY_PATH&#187;).<\/p>\n<p>Sicherheitsforscher haben eine Schwachstelle entdeckt <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.qualys.com\/\">Qualys<\/a><\/noindex>, ebenso wie <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51979\">einige zuvor ver\u00f6ffentlichte<\/a><\/noindex> Probleme. Die Forscher, die die Schwachstelle entdeckt haben, haben die Schnelligkeit der Probleml\u00f6sung hervorgehoben: Der Patch wurde vorbereitet und die Updates innerhalb von drei Stunden nach der Benachrichtigung durch das OpenBSD-Projekt ver\u00f6ffentlicht.<\/p>\n<p>Zusatz: Dem Problem wurde die Nummer <noindex><a rel=\"nofollow\" href=\"http:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2019-19726\">CVE-2019-19726<\/a><\/noindex>zugewiesen. In der Mailingliste oss-security wurde eine <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/12\/11\/9\">offizielle Ank\u00fcndigung<\/a><\/noindex>, die einen Exploit-Prototyp enth\u00e4lt, aktiviert in OpenBSD 6.6, 6.5, 6.2 und 6.1 auf den Architekturen<br \/>\namd64 und i386 (der Exploit kann auch f\u00fcr andere Architekturen angepasst werden).<br \/>\n Das Problem ist in der Standardinstallation ausnutzbar und erlaubt es einem unprivilegierten lokalen Benutzer, Code mit Root-Rechten \u00fcber die Bibliotheksersetzung beim Start der SUID-Utilities chpass oder passwd auszuf\u00fchren. Um die Bedingungen f\u00fcr die Ausnutzung zu schaffen, wird eine Speichergrenzenbeschr\u00e4nkung RLIMIT_DATA \u00fcber setrlimit gesetzt.<\/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=52012\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u0438\u043d\u0430\u043c\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u0437\u0430\u0433\u0440\u0443\u0437\u0447\u0438\u043a ld.so, \u0432\u0445\u043e\u0434\u044f\u0449\u0438\u0439 \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 OpenBSD, \u043f\u0440\u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u0443\u0441\u043b\u043e\u0432\u0438\u044f\u0445 \u043c\u043e\u0436\u0435\u0442 \u0434\u043b\u044f SUID\/SGID-\u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f \u043e\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u044e \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f LD_LIBRARY_PATH \u0438 \u0442\u0430\u043a\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0442\u044c \u0437\u0430\u0433\u0440\u0443\u0437\u0438\u0442\u044c \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u0439 \u043a\u043e\u0434 \u0432 \u043a\u043e\u043d\u0442\u0435\u043a\u0441\u0442\u0435 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430, \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u043e\u0433\u043e \u0441 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u043d\u044b\u043c\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u044f\u043c\u0438. \u041f\u0430\u0442\u0447\u0438 \u0441 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435\u043c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u044b \u0434\u043b\u044f \u0440\u0435\u043b\u0438\u0437\u043e\u0432 6.5 \u0438 6.6. \u0411\u0438\u043d\u0430\u0440\u043d\u044b\u0435 \u043f\u0430\u0442\u0447\u0438 (syspatch) \u0434\u043b\u044f \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c amd64, i386 \u0438 arm64 \u0443\u0436\u0435 \u0437\u0430\u043f\u0443\u0449\u0435\u043d\u044b \u0432 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0441\u0442\u0432\u043e \u0438 [&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-53889","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" 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