CVE-2018-7169 | BDVDB-2026-96811 Detail

Description#

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.

Impact#

Weaknesses#

References#

Exploit#

History#

1. Version 12018-02-15Record published in the CVE List.
2. Version 22024-08-05Most recent update recorded in the CVE List.