UBUNTU-CVE-2018-7169

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Source
https://ubuntu.com/security/CVE-2018-7169
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-7169.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2018-7169
Upstream
Downstream
Related
Published
2018-02-15T20:29:00Z
Modified
2025-09-08T16:44:47Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
  • Ubuntu - low
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:Pro:14.04:LTS / shadow

Package

Name
shadow
Purl
pkg:deb/ubuntu/shadow@1:4.1.5.1-1ubuntu9.5+esm1?arch=source&distro=trusty/esm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:4.1.5.1-1ubuntu9.5+esm1

Affected versions

1:4.*

1:4.1.5.1-1ubuntu6
1:4.1.5.1-1ubuntu7
1:4.1.5.1-1ubuntu8
1:4.1.5.1-1ubuntu9
1:4.1.5.1-1ubuntu9.1
1:4.1.5.1-1ubuntu9.2
1:4.1.5.1-1ubuntu9.4
1:4.1.5.1-1ubuntu9.5

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "1:4.1.5.1-1ubuntu9.5+esm1",
            "binary_name": "login"
        },
        {
            "binary_version": "1:4.1.5.1-1ubuntu9.5+esm1",
            "binary_name": "passwd"
        },
        {
            "binary_version": "1:4.1.5.1-1ubuntu9.5+esm1",
            "binary_name": "uidmap"
        }
    ]
}

Ubuntu:Pro:16.04:LTS / shadow

Package

Name
shadow
Purl
pkg:deb/ubuntu/shadow@1:4.2-3.1ubuntu5.5+esm1?arch=source&distro=esm-infra/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:4.2-3.1ubuntu5.5+esm1

Affected versions

1:4.*

1:4.1.5.1-1.1ubuntu7
1:4.2-3.1ubuntu1
1:4.2-3.1ubuntu2
1:4.2-3.1ubuntu3
1:4.2-3.1ubuntu4
1:4.2-3.1ubuntu5
1:4.2-3.1ubuntu5.2
1:4.2-3.1ubuntu5.3
1:4.2-3.1ubuntu5.4

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "1:4.2-3.1ubuntu5.5+esm1",
            "binary_name": "login"
        },
        {
            "binary_version": "1:4.2-3.1ubuntu5.5+esm1",
            "binary_name": "passwd"
        },
        {
            "binary_version": "1:4.2-3.1ubuntu5.5+esm1",
            "binary_name": "uidmap"
        }
    ]
}

Ubuntu:18.04:LTS / shadow

Package

Name
shadow
Purl
pkg:deb/ubuntu/shadow@1:4.5-1ubuntu2.2?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:4.5-1ubuntu2.2

Affected versions

1:4.*

1:4.2-3.2ubuntu4
1:4.5-1ubuntu1
1:4.5-1ubuntu2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "1:4.5-1ubuntu2.2",
            "binary_name": "login"
        },
        {
            "binary_version": "1:4.5-1ubuntu2.2",
            "binary_name": "passwd"
        },
        {
            "binary_version": "1:4.5-1ubuntu2.2",
            "binary_name": "uidmap"
        }
    ]
}