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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 Severity Score

5.3

Score breakdown

Status

Package Release Status
shadow
Launchpad, Ubuntu, Debian
impish Not vulnerable
(1:4.8.1-1ubuntu5.20.04)
bionic
Released (1:4.5-1ubuntu2.2)
groovy Not vulnerable
(1:4.8.1-1ubuntu5.20.04)
artful Ignored
(end of life)
cosmic Ignored
(end of life)
disco Ignored
(end of life)
eoan Ignored
(end of life)
focal Not vulnerable
(1:4.8.1-1ubuntu5.20.04)
hirsute Not vulnerable
(1:4.8.1-1ubuntu5.20.04)
jammy Not vulnerable
(1:4.8.1-1ubuntu5.20.04)
trusty
Released (1:4.1.5.1-1ubuntu9.5+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (4.7-1)
xenial
Released (1:4.2-3.1ubuntu5.5+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
Patches:
upstream: https://github.com/shadow-maint/shadow/commit/fb28c99b8a66ff2605c5cb96abc0a4d975f92de0

Severity score breakdown

Parameter Value
Base score 5.3
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N