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
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 |