{"id":41582,"date":"2020-02-12T16:19:30","date_gmt":"2020-02-12T13:19:30","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/uyazvimost-v-systemd-potenczialno-pozvolyayushhaya-povysit-svoi-privilegii"},"modified":"2020-02-12T16:19:30","modified_gmt":"2020-02-12T13:19:30","slug":"uyazvimost-v-systemd-potenczialno-pozvolyayushhaya-povysit-svoi-privilegii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/uyazvimost-v-systemd-potenczialno-pozvolyayushhaya-povysit-svoi-privilegii","title":{"rendered":"Vulnerabiliteti n\u00eb systemd, i cili potencialisht mund t\u00eb rris\u00eb privilegjet e tij","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

N\u00eb menaxherin e sistemit systemd u zbulua<\/a><\/noindex> nj\u00eb vulnerabilitet (CVE-2020-1712<\/a><\/noindex>), e cila potencialisht lejon ekzekutimin e kodit me privilegje t\u00eb rritura p\u00ebrmes d\u00ebrgimit t\u00eb nj\u00eb k\u00ebrkese t\u00eb formatuar posa\u00e7\u00ebrisht n\u00eb bus DBus. Problemi \u00ebsht\u00eb rregulluar n\u00eb versionin testues systemd 245-rc1<\/a><\/noindex> (patch-et q\u00eb zgjidhin problemin: 1<\/a><\/noindex>, 2<\/a><\/noindex>, 3<\/a><\/noindex>). Vulnerabiliteti \u00ebsht\u00eb eliminuar n\u00eb distribucione Ubuntu<\/a><\/noindex>, Fedora<\/a><\/noindex>, RHEL<\/a><\/noindex> (shfaqet n\u00eb RHEL 8, por nuk prek RHEL 7), CentOS<\/a><\/noindex>, SUSE\/openSUSE<\/a><\/noindex> dhe ROSA<\/a><\/noindex>, por n\u00eb momentin e shkruhjes s\u00eb lajmit mbetet e pa rregulluar n\u00eb Debian<\/a><\/noindex> dhe Arch Linux<\/a><\/noindex>. <\/p>\n

Vulnerabiliteti shkaktohet nga qasja n\u00eb nj\u00eb zon\u00eb memorjeje t\u00eb liruar tashm\u00eb (use-after-free), e cila ndodh gjat\u00eb ekzekutimit asinkron t\u00eb k\u00ebrkesave ndaj Polkit gjat\u00eb p\u00ebrpunimit t\u00eb mesazheve DBus. Disa nd\u00ebrfaqe DBus p\u00ebrdorin cache p\u00ebr ruajtjen e objekteve p\u00ebr nj\u00eb koh\u00eb t\u00eb shkurt\u00ebr dhe pastron elementet nga cache sapo bus DBus lirohet p\u00ebr t\u00eb p\u00ebrpunuar k\u00ebrkesa t\u00eb tjera. N\u00ebse menaxhuesi i metod\u00ebs DBus p\u00ebrdor bus_verify_polkit_async(), ndoshta do t'i duhet t\u00eb pres\u00eb p\u00ebrfundimin e veprimit n\u00eb Polkit. Pas gatishm\u00ebris\u00eb s\u00eb Polkit, menaxhuesi thirret p\u00ebrs\u00ebri dhe qaset n\u00eb t\u00eb dh\u00ebnat e alokuara m\u00eb par\u00eb n\u00eb memorje. N\u00ebse k\u00ebrkesa ndaj Polkit zgjat shum\u00eb, at\u00ebher\u00eb elementet n\u00eb cache do t\u00eb pastrohen para se menaxhuesi i metod\u00ebs DBus t\u00eb thirret p\u00ebr her\u00eb t\u00eb dyt\u00eb. <\/p>\n

Nga sh\u00ebrbimet q\u00eb mund t\u00eb shfryt\u00ebzojn\u00eb vulnerabilitetin, theksohet systemd-machined, i cili ofron API DBus org.freedesktop.machine1.Image.Clone, q\u00eb \u00e7on n\u00eb ruajtjen e p\u00ebrkohshme t\u00eb t\u00eb dh\u00ebnave n\u00eb cache dhe qasjen asinkrone ndaj Polkit. Nd\u00ebrfaqja
\norg.freedesktop.machine1.Image.Clone \u00ebsht\u00eb e aksesueshme nga t\u00eb gjith\u00eb p\u00ebrdoruesit e pand\u00ebrprer\u00eb t\u00eb sistemit, t\u00eb cil\u00ebt mund t\u00eb nisin d\u00ebshtimin e sh\u00ebrbimeve systemd ose potencialisht t\u00eb arrijn\u00eb ekzekutimin e kodit me t\u00eb drejtat e root (prototipi i shfryt\u00ebzuesit ende nuk \u00ebsht\u00eb demonstruar). Kodi q\u00eb lejon shfryt\u00ebzimin e vulnerabilitetit ishte \u00ebsht\u00eb shtuar<\/a><\/noindex> n\u00eb systemd-machined n\u00eb vitin 2015 n\u00eb versionin systemd 220<\/a><\/noindex> (n\u00eb RHEL 7.x p\u00ebrdoret systemd 219). <\/p>\n

<\/a><\/noindex><\/p>\n

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

\u0412 \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u043e\u043c \u043c\u0435\u043d\u0435\u0434\u0436\u0435\u0440\u0435 systemd \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-1712), \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u0441 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u043d\u044b\u043c\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u044f\u043c\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\u043e\u0433\u043e \u0437\u0430\u043f\u0440\u043e\u0441\u0430 \u043f\u043e \u0448\u0438\u043d\u0435 DBus. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0430 \u0432 \u0442\u0435\u0441\u0442\u043e\u0432\u043e\u043c \u0432\u044b\u043f\u0443\u0441\u043a\u0435 systemd 245-rc1 (\u0440\u0435\u0448\u0430\u044e\u0449\u0438\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0443 \u043f\u0430\u0442\u0447\u0438: 1, 2, 3). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 Ubuntu, Fedora, RHEL (\u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 RHEL 8, \u043d\u043e \u043d\u0435 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 RHEL 7), CentOS, 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