CVE-2018-18955

描述

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.

受影響套件(1)

• Debian/linuxfrom 0, < 4.18.20-1

CVSS 分數

參考連結(1)

• ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2018-18955