{"id":103146,"date":"2022-01-31T15:36:54","date_gmt":"2022-01-31T13:36:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-mehanizme-ucount-yadra-linux-pozvolyayushhaya-povysit-svoi-privilegii"},"modified":"2022-01-31T15:36:54","modified_gmt":"2022-01-31T13:36:54","slug":"uyazvimost-v-mehanizme-ucount-yadra-linux-pozvolyayushhaya-povysit-svoi-privilegii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/nl\/blog\/news\/uyazvimost-v-mehanizme-ucount-yadra-linux-pozvolyayushhaya-povysit-svoi-privilegii","title":{"rendered":"Kwetsbaarheid in de ucount-mechanisme van de Linux-kernel die in staat stelt om privileges te verhogen","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

In de Linux-kernel is in de code voor het verwerken van beperkingen rlimit in verschillende gebruikersnamespaces een kwetsbaarheid (CVE-2022-24122) ontdekt, die het mogelijk maakt om de privileges in het systeem te verhogen. Het probleem doet zich voor vanaf kernelversie 5.14 en zal worden verholpen in de updates 5.16.5 en 5.15.19. De stabiele versies van Debian, Ubuntu, SUSE\/openSUSE en RHEL worden niet getroffen, maar het probleem doet zich voor in recente kernels van Fedora en Arch Linux. <\/p>\n

De fout is toegevoegd in de wijziging die in de zomer van 2021 is doorgevoerd en die de implementatie van bepaalde RLIMIT-tellers omzet in het gebruik van de structuur «ucounts». De voor RLIMIT gemaakte «ucounts»-objecten werden na het vrijgeven van het geheugen dat voor hen was toegewezen (use-after-free) nog steeds gebruikt bij het verwijderen van de bijbehorende naamruimte, wat mogelijk maakte om eigen code op kernniveau uit te voeren. <\/p>\n

Het misbruiken van de kwetsbaarheid door een niet-bevoorrechte gebruiker is alleen mogelijk wanneer niet-bevoorrecht toegang tot de gebruikersnamespace is ingeschakeld in het systeem, wat standaard is ingeschakeld in Ubuntu en Fedora, maar niet is geactiveerd in Debian en RHEL. Als workaround om de kwetsbaarheid te blokkeren, kan niet-bevoorrecht toegang tot de gebruikersnamespace worden uitgeschakeld: sysctl -w kernel.unprivileged_userns_clone=0
\n
Bron: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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