CWE Code: 732
Vulnerability Type: privilege_escalation
CVSS Score: 5.0
CWE Name:  Incorrect Permission Assignment for Critical Resource
Summary: an issue was discovered in shadow 4.5. newgidmap (in shadow-utils) is setuid and allows an unprivileged user to be placed in a user namespace where setgroups(2) is permitted. this allows an attacker to remove themselves from a supplementary group, which may allow access to certain filesystem paths if the administrator has used "group blacklisting" (e.g., chmod g-rwx) to restrict access to paths. this flaw effectively reverts a security feature in the kernel (in particular, the /proc/self/setgroups knob) to prevent this sort of privilege escalation.
Access Authentication: NONE
Access Complexity: LOW
Access Vector: NETWORK
Impact (C/I/A): PARTIAL/NONE/NONE
Published Date: 2018-02-15
Last Modified Date: 2019-10-03