USN-4424-1 (UBUNTU-CVE-2020-11933)
Vulnerability from osv_ubuntu – Published: 2020-07-15 14:49 – Updated: 2026-02-10 04:41 – Source website
VLAI
Summary
snapd vulnerabilities
Details
It was discovered that cloud-init as managed by snapd on Ubuntu Core 16 and Ubuntu Core 18 devices ran on every boot without restrictions. A physical attacker could exploit this to craft cloud-init user-data/meta-data via external media to perform arbitrary changes on the device to bypass intended security mechanisms such as full disk encryption. This issue did not affect traditional Ubuntu systems. (CVE-2020-11933)
It was discovered that snapctl user-open allowed altering the XDG_DATA_DIRS environment variable when calling the system xdg-open. A malicious snap could exploit this to bypass intended access restrictions to control how the host system xdg-open script opens the URL. This issue did not affect Ubuntu Core systems. (CVE-2020-11934)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2020-11934",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:16.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "golang-github-snapcore-snapd-dev",
"binary_version": "2.45.1ubuntu0.2"
},
{
"binary_name": "golang-github-ubuntu-core-snappy-dev",
"binary_version": "2.45.1ubuntu0.2"
},
{
"binary_name": "snap-confine",
"binary_version": "2.45.1ubuntu0.2"
},
{
"binary_name": "snapd",
"binary_version": "2.45.1ubuntu0.2"
},
{
"binary_name": "snapd-xdg-open",
"binary_version": "2.45.1ubuntu0.2"
},
{
"binary_name": "ubuntu-core-launcher",
"binary_version": "2.45.1ubuntu0.2"
},
{
"binary_name": "ubuntu-core-snapd-units",
"binary_version": "2.45.1ubuntu0.2"
},
{
"binary_name": "ubuntu-snappy",
"binary_version": "2.45.1ubuntu0.2"
},
{
"binary_name": "ubuntu-snappy-cli",
"binary_version": "2.45.1ubuntu0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "snapd",
"purl": "pkg:deb/ubuntu/snapd@2.45.1ubuntu0.2?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.45.1ubuntu0.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.9",
"1.9.1.1",
"1.9.2",
"2.0",
"2.0.1",
"2.0.2",
"2.0.3",
"2.0.5",
"2.0.8",
"2.0.9",
"2.0.10",
"2.11+0.16.04",
"2.12+0.16.04",
"2.13",
"2.14.2~16.04",
"2.15.2ubuntu1",
"2.16ubuntu3",
"2.17.1ubuntu1",
"2.20.1ubuntu1",
"2.21",
"2.22.2",
"2.22.3",
"2.22.6",
"2.23.1",
"2.24.1",
"2.25",
"2.26.10",
"2.27.5",
"2.28.5",
"2.29.4.2",
"2.32.3.2",
"2.32.9",
"2.33.1ubuntu2",
"2.34.2",
"2.34.2ubuntu0.1",
"2.37.4",
"2.37.4ubuntu0.1",
"2.38",
"2.39.2",
"2.39.2ubuntu0.2",
"2.40",
"2.42.1",
"2.45.1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2020-11934",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "golang-github-snapcore-snapd-dev",
"binary_version": "2.45.1+18.04.2"
},
{
"binary_name": "golang-github-ubuntu-core-snappy-dev",
"binary_version": "2.45.1+18.04.2"
},
{
"binary_name": "snap-confine",
"binary_version": "2.45.1+18.04.2"
},
{
"binary_name": "snapd",
"binary_version": "2.45.1+18.04.2"
},
{
"binary_name": "snapd-xdg-open",
"binary_version": "2.45.1+18.04.2"
},
{
"binary_name": "ubuntu-core-launcher",
"binary_version": "2.45.1+18.04.2"
},
{
"binary_name": "ubuntu-core-snapd-units",
"binary_version": "2.45.1+18.04.2"
},
{
"binary_name": "ubuntu-snappy",
"binary_version": "2.45.1+18.04.2"
},
{
"binary_name": "ubuntu-snappy-cli",
"binary_version": "2.45.1+18.04.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "snapd",
"purl": "pkg:deb/ubuntu/snapd@2.45.1+18.04.2?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.45.1+18.04.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.28.5+17.10",
"2.29.4.1+18.04",
"2.29.4.2+18.04",
"2.31.1+18.04",
"2.32+18.04~pre5",
"2.32+18.04~pre6",
"2.32+18.04",
"2.32.3.2+18.04",
"2.32.5+18.04",
"2.32.8+18.04",
"2.32.9+18.04",
"2.33.1+18.04ubuntu2",
"2.34.2+18.04",
"2.34.2+18.04.1",
"2.37.1+18.04",
"2.37.1.1+18.04",
"2.37.4+18.04",
"2.37.4+18.04.1",
"2.38+18.04",
"2.39.2+18.04",
"2.40+18.04",
"2.42.1+18.04",
"2.45.1+18.04"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2020-11934",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "golang-github-snapcore-snapd-dev",
"binary_version": "2.45.1+20.04.2"
},
{
"binary_name": "golang-github-ubuntu-core-snappy-dev",
"binary_version": "2.45.1+20.04.2"
},
{
"binary_name": "snap-confine",
"binary_version": "2.45.1+20.04.2"
},
{
"binary_name": "snapd",
"binary_version": "2.45.1+20.04.2"
},
{
"binary_name": "snapd-xdg-open",
"binary_version": "2.45.1+20.04.2"
},
{
"binary_name": "ubuntu-core-launcher",
"binary_version": "2.45.1+20.04.2"
},
{
"binary_name": "ubuntu-core-snapd-units",
"binary_version": "2.45.1+20.04.2"
},
{
"binary_name": "ubuntu-snappy",
"binary_version": "2.45.1+20.04.2"
},
{
"binary_name": "ubuntu-snappy-cli",
"binary_version": "2.45.1+20.04.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "snapd",
"purl": "pkg:deb/ubuntu/snapd@2.45.1+20.04.2?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.45.1+20.04.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.41+19.10.1",
"2.42.1+20.04",
"2.43.3+git1.8109f8",
"2.44~pre1+20.04",
"2.44+20.04",
"2.44.2+20.04",
"2.44.3+20.04",
"2.45.1+20.04"
]
}
],
"aliases": [],
"details": "It was discovered that cloud-init as managed by snapd on Ubuntu Core 16 and\nUbuntu Core 18 devices ran on every boot without restrictions. A physical\nattacker could exploit this to craft cloud-init user-data/meta-data via\nexternal media to perform arbitrary changes on the device to bypass\nintended security mechanisms such as full disk encryption. This issue did\nnot affect traditional Ubuntu systems. (CVE-2020-11933)\n\nIt was discovered that snapctl user-open allowed altering the XDG_DATA_DIRS \nenvironment variable when calling the system xdg-open. A malicious snap \ncould exploit this to bypass intended access restrictions to control how\nthe host system xdg-open script opens the URL. This issue did not affect \nUbuntu Core systems. (CVE-2020-11934)\n",
"id": "USN-4424-1",
"modified": "2026-02-10T04:41:52Z",
"published": "2020-07-15T14:49:53Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-4424-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2020-11933"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2020-11934"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "snapd vulnerabilities",
"upstream": [
"UBUNTU-CVE-2020-11933",
"UBUNTU-CVE-2020-11934"
]
}
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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.
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- 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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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