View at Official alpine advisory, NVD, CVE.org · CVE detail
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CVE-2018-7169: 1 source package rows (shadow); 2 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 2.
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.