ubuntu-cve-2019-3842
Vulnerability from osv_ubuntu
Published
2019-04-08 00:00
Modified
2026-04-22 07:38
Summary
Details
In systemd before v242-rc4, it was discovered that pam_systemd does not properly sanitize the environment before using the XDG_SEAT variable. It is possible for an attacker, in some particular configurations, to set a XDG_SEAT environment variable which allows for commands to be checked against polkit policies using the "allow_active" element rather than "allow_any".
Severity
7.0 (High)
4.5 (Medium)
7.0 (High)
N/A (UNKNOWN)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "gir1.2-gudev-1.0",
"binary_version": "1:204-5ubuntu20.31"
},
{
"binary_name": "libgudev-1.0-0",
"binary_version": "1:204-5ubuntu20.31"
},
{
"binary_name": "libpam-systemd",
"binary_version": "204-5ubuntu20.31"
},
{
"binary_name": "libsystemd-daemon0",
"binary_version": "204-5ubuntu20.31"
},
{
"binary_name": "libsystemd-id128-0",
"binary_version": "204-5ubuntu20.31"
},
{
"binary_name": "libsystemd-journal0",
"binary_version": "204-5ubuntu20.31"
},
{
"binary_name": "libsystemd-login0",
"binary_version": "204-5ubuntu20.31"
},
{
"binary_name": "libudev1",
"binary_version": "204-5ubuntu20.31"
},
{
"binary_name": "python-systemd",
"binary_version": "204-5ubuntu20.31"
},
{
"binary_name": "systemd",
"binary_version": "204-5ubuntu20.31"
},
{
"binary_name": "systemd-services",
"binary_version": "204-5ubuntu20.31"
},
{
"binary_name": "udev",
"binary_version": "204-5ubuntu20.31"
}
]
},
"package": {
"ecosystem": "Ubuntu:14.04:LTS",
"name": "systemd",
"purl": "pkg:deb/ubuntu/systemd@204-5ubuntu20.31?arch=source\u0026distro=trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "204-5ubuntu20.31"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"204-0ubuntu18",
"204-0ubuntu19",
"204-5ubuntu3",
"204-5ubuntu5",
"204-5ubuntu6",
"204-5ubuntu7",
"204-5ubuntu8",
"204-5ubuntu9",
"204-5ubuntu10",
"204-5ubuntu11",
"204-5ubuntu13",
"204-5ubuntu14",
"204-5ubuntu15",
"204-5ubuntu16",
"204-5ubuntu17",
"204-5ubuntu18",
"204-5ubuntu19",
"204-5ubuntu20",
"204-5ubuntu20.2",
"204-5ubuntu20.3",
"204-5ubuntu20.4",
"204-5ubuntu20.5",
"204-5ubuntu20.6",
"204-5ubuntu20.7",
"204-5ubuntu20.8",
"204-5ubuntu20.9",
"204-5ubuntu20.10",
"204-5ubuntu20.11",
"204-5ubuntu20.12",
"204-5ubuntu20.13",
"204-5ubuntu20.14",
"204-5ubuntu20.15",
"204-5ubuntu20.18",
"204-5ubuntu20.19",
"204-5ubuntu20.20",
"204-5ubuntu20.21",
"204-5ubuntu20.22",
"204-5ubuntu20.24",
"204-5ubuntu20.25",
"204-5ubuntu20.26",
"204-5ubuntu20.28",
"204-5ubuntu20.29"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libnss-myhostname",
"binary_version": "229-4ubuntu21.21"
},
{
"binary_name": "libnss-mymachines",
"binary_version": "229-4ubuntu21.21"
},
{
"binary_name": "libnss-resolve",
"binary_version": "229-4ubuntu21.21"
},
{
"binary_name": "libpam-systemd",
"binary_version": "229-4ubuntu21.21"
},
{
"binary_name": "libsystemd0",
"binary_version": "229-4ubuntu21.21"
},
{
"binary_name": "libudev1",
"binary_version": "229-4ubuntu21.21"
},
{
"binary_name": "systemd",
"binary_version": "229-4ubuntu21.21"
},
{
"binary_name": "systemd-container",
"binary_version": "229-4ubuntu21.21"
},
{
"binary_name": "systemd-coredump",
"binary_version": "229-4ubuntu21.21"
},
{
"binary_name": "systemd-journal-remote",
"binary_version": "229-4ubuntu21.21"
},
{
"binary_name": "systemd-sysv",
"binary_version": "229-4ubuntu21.21"
},
{
"binary_name": "udev",
"binary_version": "229-4ubuntu21.21"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "systemd",
"purl": "pkg:deb/ubuntu/systemd@229-4ubuntu21.21?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "229-4ubuntu21.21"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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",
"229-4ubuntu21.1",
"229-4ubuntu21.2",
"229-4ubuntu21.3",
"229-4ubuntu21.4",
"229-4ubuntu21.5",
"229-4ubuntu21.6",
"229-4ubuntu21.8",
"229-4ubuntu21.9",
"229-4ubuntu21.10",
"229-4ubuntu21.15",
"229-4ubuntu21.16",
"229-4ubuntu21.17",
"229-4ubuntu21.19"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libnss-myhostname",
"binary_version": "237-3ubuntu10.19"
},
{
"binary_name": "libnss-mymachines",
"binary_version": "237-3ubuntu10.19"
},
{
"binary_name": "libnss-resolve",
"binary_version": "237-3ubuntu10.19"
},
{
"binary_name": "libnss-systemd",
"binary_version": "237-3ubuntu10.19"
},
{
"binary_name": "libpam-systemd",
"binary_version": "237-3ubuntu10.19"
},
{
"binary_name": "libsystemd0",
"binary_version": "237-3ubuntu10.19"
},
{
"binary_name": "libudev1",
"binary_version": "237-3ubuntu10.19"
},
{
"binary_name": "systemd",
"binary_version": "237-3ubuntu10.19"
},
{
"binary_name": "systemd-container",
"binary_version": "237-3ubuntu10.19"
},
{
"binary_name": "systemd-coredump",
"binary_version": "237-3ubuntu10.19"
},
{
"binary_name": "systemd-journal-remote",
"binary_version": "237-3ubuntu10.19"
},
{
"binary_name": "systemd-sysv",
"binary_version": "237-3ubuntu10.19"
},
{
"binary_name": "systemd-tests",
"binary_version": "237-3ubuntu10.19"
},
{
"binary_name": "udev",
"binary_version": "237-3ubuntu10.19"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "systemd",
"purl": "pkg:deb/ubuntu/systemd@237-3ubuntu10.19?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "237-3ubuntu10.19"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"234-2ubuntu12",
"235-2ubuntu3",
"235-3ubuntu2",
"235-3ubuntu3",
"237-3ubuntu3",
"237-3ubuntu4",
"237-3ubuntu6",
"237-3ubuntu7",
"237-3ubuntu8",
"237-3ubuntu10",
"237-3ubuntu10.2",
"237-3ubuntu10.3",
"237-3ubuntu10.4",
"237-3ubuntu10.6",
"237-3ubuntu10.9",
"237-3ubuntu10.11",
"237-3ubuntu10.12",
"237-3ubuntu10.13",
"237-3ubuntu10.15",
"237-3ubuntu10.17"
]
}
],
"aliases": [],
"details": "In systemd before v242-rc4, it was discovered that pam_systemd does not properly sanitize the environment before using the XDG_SEAT variable. It is possible for an attacker, in some particular configurations, to set a XDG_SEAT environment variable which allows for commands to be checked against polkit policies using the \"allow_active\" element rather than \"allow_any\".",
"id": "UBUNTU-CVE-2019-3842",
"modified": "2026-04-22T07:38:52Z",
"published": "2019-04-08T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2019-3842"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-3938-1"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-3842"
}
],
"related": [
"USN-3938-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2019-3842"
]
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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