{"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\/et\/blog\/novosti-interneta\/uyazvimost-v-ld-so-openbsd","title":{"rendered":"Haavatavus ld.so OpenBSD-s","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>D\u00fcnaamiline laadija <noindex><a rel=\"nofollow\" href=\"http:\/\/man.openbsd.org\/OpenBSD-6.6\/ld.so.1\">ld.so<\/a><\/noindex>, mis kuulub OpenBSD-sse, v\u00f5ib teatud tingimustel j\u00e4tta SUID\/SGID <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Suid\">-rakenduste keskkonnamuutuja LD_LIBRARY_PATH'i ja seel\u00e4bi lubada kolmanda osapoole koodi laadimist protsessi kontekstis, mis t\u00f6\u00f6tab k\u00f5rgendatud privileegidega. Haavatavuse parandamise plaastrid on saadaval versioonide jaoks<\/a><\/noindex>. Binaarplaastrid ( <noindex><a rel=\"nofollow\" href=\"https:\/\/ftp.openbsd.org\/pub\/OpenBSD\/patches\/6.5\/common\/024_ldso.patch.sig\">6.5<\/a><\/noindex> ja <noindex><a rel=\"nofollow\" href=\"https:\/\/ftp.openbsd.org\/pub\/OpenBSD\/patches\/6.6\/common\/013_ldso.patch.sig\">6.6<\/a><\/noindex>. \u0411\u0438\u043d\u0430\u0440\u043d\u044b\u0435 \u043f\u0430\u0442\u0447\u0438 (<noindex><a rel=\"nofollow\" href=\"http:\/\/man.openbsd.org\/OpenBSD-6.6\/syspatch.8\">syspatch<\/a><\/noindex>) platvormidele amd64, i386 ja arm64 on juba tootmisse l\u00e4inud ning peaksid olema saadaval allalaadimiseks k\u00e4esoleva uudise avaldamise ajaks.<\/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>Haavatavus leiti spetsialistide poolt <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.qualys.com\/\">Qualys<\/a><\/noindex>, samuti nagu <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51979\">m\u00f5ned varasemad<\/a><\/noindex> probleemid. Haavatavuse avastanud k\u00fcber- ja turvaeksperdid m\u00e4rkisid probleemide lahendamise kiiruse: patch oli valmis ja uuendused v\u00e4lja antud kolme tunni jooksul p\u00e4rast projekti OpenBSD teavitamist.<\/p>\n<p>Lisa: Probleemile on antud number <noindex><a rel=\"nofollow\" href=\"http:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2019-19726\">CVE-2019-19726<\/a><\/noindex>. Mailing list\u2019is oss-security on tehtud <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/12\/11\/9\">ametlik teadaanne<\/a><\/noindex>, mis sisaldab protot\u00fc\u00fcpi eksploitist, mis t\u00f6\u00f6tab OpenBSD 6.6, 6.5, 6.2 ja 6.1 arhitektuuridel.<br \/>\namd64 ja i386 (eksploit v\u00f5ib olla kohandatud ka teiste arhitektuuride jaoks).<br \/>\n Probleem on \u00e4ra kasutatav vaikimisi seadistuses ja v\u00f5imaldab privileege mitteomaval kohaliku kasutajal k\u00e4ivitada koodi root \u00f5igustega, asendades teegi suid-utiliitide chpass v\u00f5i passwd k\u00e4ivitamisel. Eksploiteerimise vajalike tingimuste loomiseks kasutatakse m\u00e4lulimiidi seadistust RLIMIT_DATA l\u00e4bi setrlimit.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Allikas: <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\" content=\"\u0414\u0438\u043d\u0430\u043c\u0438\u0447\u0435\u0441\u043a\u0438\u0439 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