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CVE-2018-7169

Published: 15 February 2018

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.

Priority

Low

CVSS 3 base score: 5.3

Status

Package Release Status
shadow
Launchpad, Ubuntu, Debian
artful Ignored
(reached end-of-life)
bionic
Released (1:4.5-1ubuntu2.2)
cosmic Ignored
(reached end-of-life)
disco Ignored
(reached end-of-life)
eoan Ignored
(reached end-of-life)
focal Not vulnerable
(1:4.8.1-1ubuntu5.20.04)
groovy Not vulnerable
(1:4.8.1-1ubuntu5.20.04)
hirsute Not vulnerable
(1:4.8.1-1ubuntu5.20.04)
impish Not vulnerable
(1:4.8.1-1ubuntu5.20.04)
jammy Not vulnerable
(1:4.8.1-1ubuntu5.20.04)
precise Ignored
(end of ESM support, was needs-triage)
trusty
Released (1:4.1.5.1-1ubuntu9.5+esm1)
upstream
Released (4.7-1)
xenial
Released (1:4.2-3.1ubuntu5.5+esm1)