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 |