Mirrors
/
linux-kernel-exploits
mirror of https://github.com/SecWiki/linux-kernel-exploits
6
0
Fork 0
Code Issues Projects Releases Wiki Activity
linux-kernel-exploits/2018/CVE-2018-18955
History
Aaron Lewis d81f9beb79 add references 2019-03-16 18:38:32 +08:00
..
exploit.cron.sh add CVE-2018-18955 2019-03-16 18:37:18 +08:00
exploit.dbus.sh add CVE-2018-18955 2019-03-16 18:37:18 +08:00
exploit.ldpreload.sh add CVE-2018-18955 2019-03-16 18:37:18 +08:00
exploit.polkit.sh add CVE-2018-18955 2019-03-16 18:37:18 +08:00
libsubuid.c add CVE-2018-18955 2019-03-16 18:37:18 +08:00
libsubuid.so add CVE-2018-18955 2019-03-16 18:37:18 +08:00
readme.md add references 2019-03-16 18:38:32 +08:00
rootshell.c add CVE-2018-18955 2019-03-16 18:37:18 +08:00
subshell.c add CVE-2018-18955 2019-03-16 18:37:18 +08:00
subuid_shell.c add CVE-2018-18955 2019-03-16 18:37:18 +08:00

readme.md

CVE-2018-18955

In the Linux kernel 4.15.x through 4.19.x before 4.19.2, map_write() in kernel/user_namespace.c allows privilege escalation because it mishandles nested user namespaces with more than 5 UID or GID ranges. A user who has CAP_SYS_ADMIN in an affected user namespace can bypass access controls on resources outside the namespace, as demonstrated by reading /etc/shadow. This occurs because an ID transformation takes place properly for the namespaced-to-kernel direction but not for the kernel-to-namespaced direction.

References