Vulnerability Details CVE-2018-7169
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 52.2%
CVSS Severity
CVSS v3 Score 5.3
CVSS v2 Score 5.0
References
Products affected by CVE-2018-7169
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cpe:2.3:a:shadow_project:shadow:4.5