CVE-2018-18955 in Kernel
요약 (영어)
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.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
예약하다
2018. 11. 05.
공개
2018. 11. 16.
상태
확인됨
엔트리
VulDB provides additional information and datapoints for this CVE:
| 아이디 | 취약성 | CWE | 악용 | 대책 | CVE |
|---|---|---|---|---|---|
| 126963 | Linux Kernel Access Control user_namespace.c map_write 권한 상승 | 20 | 높음 | 공식 수정 | CVE-2018-18955 |