{"id":53577,"date":"2019-12-05T00:00:00","date_gmt":"2019-12-04T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/mnozhestvennye-uyazvimosti-v-openbsd"},"modified":"2020-02-18T14:01:30","modified_gmt":"2020-02-18T11:01:30","slug":"mnozhestvennye-uyazvimosti-v-openbsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/mnozhestvennye-uyazvimosti-v-openbsd","title":{"rendered":"Vulnerabilit\u0103\u021bi multiple \u00een OpenBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Speciali\u0219tii de la Qualys Labs au descoperit mai multe probleme de securitate legate de posibilitatea de a \u00een\u0219ela programele responsabile pentru mecanismele de verificare a parolelor utilizate \u00een BSD (analog PAM). \u00cen\u0219el\u0103ciunea const\u0103 \u00een transmiterea numelui de utilizator \u00ab-schallenge\u00bb sau \u00ab-schallenge:passwd\u00bb, care este apoi interpretat nu ca nume de utilizator, ci ca op\u021biune. Dup\u0103 aceasta, sistemul accept\u0103 orice parol\u0103. Vulnerabile, adic\u0103 permit \u00een final accesul neautorizat, sunt serviciile smtpd, ldapd, radiusd. Serviciul sshd nu poate fi exploatat, deoarece ulterior sshd observ\u0103 c\u0103 utilizatorul \u00ab-schallenge\u00bb de fapt nu exist\u0103. Programul su, \u00een \u00eencercarea de a fi exploatat direct, se pr\u0103bu\u0219e\u0219te, deoarece \u00eencearc\u0103 de asemenea s\u0103 determine uid-ul unui utilizator inexistent.<\/p>\n

De asemenea, au fost dezv\u0103luite vulnerabilit\u0103\u021bi diverse \u00een xlock, \u00een autorizarea prin S\/Key \u0219i Yubikey, precum \u0219i \u00een su, care nu sunt legate de specificarea utilizatorului \u00ab-schallenge\u00bb. Vulnerabilitatea din xlock permite unui utilizator obi\u0219nuit s\u0103 \u00ee\u0219i creasc\u0103 privilegiile p\u00e2n\u0103 la grupul auth. Prin func\u021bionarea defectuoas\u0103 a mecanismelor de autorizare prin S\/Key \u0219i Yubikey, se pot ob\u021bine privilegii de la grupul auth p\u00e2n\u0103 la utilizatorul root, dar \u00een configura\u021bia OpenBSD, \u00een mod implicit, acest lucru nu func\u021bioneaz\u0103, deoarece autorizarea prin S\/Key \u0219i Yubikey este dezactivat\u0103. \u00cen cele din urm\u0103, vulnerabilitatea din su permite utilizatorului s\u0103 \u00ee\u0219i creasc\u0103 limitele resurselor de sistem, cum ar fi num\u0103rul descriptorilor de fi\u0219iere deschi\u0219i.<\/p>\n

\u00cen prezent, vulnerabilit\u0103\u021bile au fost remediate, actualiz\u0103rile de securitate fiind disponibile prin mecanismul standard syspatch(8).<\/p>\n

Sursa: linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0421\u043f\u0435\u0446\u0438\u0430\u043b\u0438\u0441\u0442\u044b \u0438\u0437 Qualys Labs \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0438\u043b\u0438 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0445 \u0441 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c\u044e \u043e\u0431\u043c\u0430\u043d\u0443\u0442\u044c \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u044b, \u043e\u0442\u0432\u0435\u0447\u0430\u044e\u0449\u0438\u0435 \u0437\u0430 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0435 \u0432 BSD \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u044b \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043f\u0430\u0440\u043e\u043b\u0435\u0439 (\u0430\u043d\u0430\u043b\u043e\u0433 PAM). \u041e\u0431\u043c\u0430\u043d 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