UBUNTU-CVE-2018-6954

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Source
https://ubuntu.com/security/CVE-2018-6954
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-6954.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2018-6954
Related
Published
2018-02-13T00:00:00Z
Modified
2025-06-10T15:28:26Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • 7.8 (High) CVSS_V3 - CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on.

References

Affected packages

Ubuntu:16.04:LTS / systemd

Package

Name
systemd
Purl
pkg:deb/ubuntu/systemd@229-4ubuntu21.15?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
229-4ubuntu21.15

Affected versions

Other

225-1ubuntu9
227-2ubuntu1
227-2ubuntu2
228-1ubuntu2
228-2ubuntu1
228-2ubuntu2
228-3ubuntu1
228-4ubuntu1
228-4ubuntu2
228-5ubuntu1
228-5ubuntu2
228-5ubuntu3
228-6ubuntu1
229-1ubuntu2
229-1ubuntu4
229-2ubuntu1
229-3ubuntu1
229-3ubuntu2
229-4ubuntu1
229-4ubuntu4
229-4ubuntu5
229-4ubuntu6
229-4ubuntu7
229-4ubuntu8
229-4ubuntu10
229-4ubuntu11
229-4ubuntu12
229-4ubuntu13
229-4ubuntu16
229-4ubuntu17
229-4ubuntu19
229-4ubuntu20
229-4ubuntu21

229-4ubuntu21.*

229-4ubuntu21.1
229-4ubuntu21.2
229-4ubuntu21.3
229-4ubuntu21.4
229-4ubuntu21.5
229-4ubuntu21.6
229-4ubuntu21.8
229-4ubuntu21.9
229-4ubuntu21.10

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libnss-myhostname",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "libnss-myhostname-dbgsym",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "libnss-mymachines",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "libnss-mymachines-dbgsym",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "libnss-resolve",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "libnss-resolve-dbgsym",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "libpam-systemd",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "libpam-systemd-dbgsym",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "libsystemd-dev",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "libsystemd-dev-dbgsym",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "libsystemd0",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "libsystemd0-dbgsym",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "libudev-dev",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "libudev-dev-dbgsym",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "libudev1",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "libudev1-dbgsym",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "libudev1-udeb",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "libudev1-udeb-dbgsym",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "systemd",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "systemd-container",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "systemd-container-dbgsym",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "systemd-coredump",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "systemd-coredump-dbgsym",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "systemd-dbg",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "systemd-dbgsym",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "systemd-journal-remote",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "systemd-journal-remote-dbgsym",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "systemd-sysv",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "systemd-sysv-dbgsym",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "udev",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "udev-dbgsym",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "udev-udeb",
            "binary_version": "229-4ubuntu21.15"
        },
        {
            "binary_name": "udev-udeb-dbgsym",
            "binary_version": "229-4ubuntu21.15"
        }
    ],
    "availability": "No subscription required",
    "ubuntu_priority": "medium"
}

Ubuntu:18.04:LTS / systemd

Package

Name
systemd
Purl
pkg:deb/ubuntu/systemd@237-3ubuntu10.9?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
237-3ubuntu10.9

Affected versions

Other

234-2ubuntu12
235-2ubuntu3
235-3ubuntu2
235-3ubuntu3
237-3ubuntu3
237-3ubuntu4
237-3ubuntu6
237-3ubuntu7
237-3ubuntu8
237-3ubuntu10

237-3ubuntu10.*

237-3ubuntu10.2
237-3ubuntu10.3
237-3ubuntu10.4
237-3ubuntu10.6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libnss-myhostname",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "libnss-myhostname-dbgsym",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "libnss-mymachines",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "libnss-mymachines-dbgsym",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "libnss-resolve",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "libnss-resolve-dbgsym",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "libnss-systemd",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "libnss-systemd-dbgsym",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "libpam-systemd",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "libpam-systemd-dbgsym",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "libsystemd-dev",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "libsystemd0",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "libsystemd0-dbgsym",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "libudev-dev",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "libudev1",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "libudev1-dbgsym",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "libudev1-udeb",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "systemd",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "systemd-container",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "systemd-container-dbgsym",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "systemd-coredump",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "systemd-coredump-dbgsym",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "systemd-dbgsym",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "systemd-journal-remote",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "systemd-journal-remote-dbgsym",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "systemd-sysv",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "systemd-tests",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "systemd-tests-dbgsym",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "udev",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "udev-dbgsym",
            "binary_version": "237-3ubuntu10.9"
        },
        {
            "binary_name": "udev-udeb",
            "binary_version": "237-3ubuntu10.9"
        }
    ],
    "availability": "No subscription required",
    "ubuntu_priority": "medium"
}