USN-4705-1 (UBUNTU-CVE-2021-3156)
Vulnerability from osv_ubuntu – Published: 2021-01-26 18:48 – Updated: 2026-04-27 14:11 – Source website
VLAI
Summary
sudo vulnerabilities
Details
It was discovered that Sudo incorrectly handled memory when parsing command lines. A local attacker could possibly use this issue to obtain unintended access to the administrator account. (CVE-2021-3156)
It was discovered that the Sudo sudoedit utility incorrectly handled checking directory permissions. A local attacker could possibly use this issue to bypass file permissions and determine if a directory exists or not. (CVE-2021-23239)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2021-3156",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "high",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-23239",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:16.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "sudo",
"binary_version": "1.8.16-0ubuntu1.10"
},
{
"binary_name": "sudo-ldap",
"binary_version": "1.8.16-0ubuntu1.10"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "sudo",
"purl": "pkg:deb/ubuntu/sudo@1.8.16-0ubuntu1.10?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.8.16-0ubuntu1.10"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.8.12-1ubuntu3",
"1.8.16-0ubuntu1",
"1.8.16-0ubuntu1.1",
"1.8.16-0ubuntu1.2",
"1.8.16-0ubuntu1.3",
"1.8.16-0ubuntu1.4",
"1.8.16-0ubuntu1.5",
"1.8.16-0ubuntu1.6",
"1.8.16-0ubuntu1.7",
"1.8.16-0ubuntu1.8",
"1.8.16-0ubuntu1.9"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2021-3156",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "high",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-23239",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "sudo",
"binary_version": "1.8.21p2-3ubuntu1.4"
},
{
"binary_name": "sudo-ldap",
"binary_version": "1.8.21p2-3ubuntu1.4"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "sudo",
"purl": "pkg:deb/ubuntu/sudo@1.8.21p2-3ubuntu1.4?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.8.21p2-3ubuntu1.4"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.8.20p2-1ubuntu1",
"1.8.21p2-2ubuntu1",
"1.8.21p2-3ubuntu1",
"1.8.21p2-3ubuntu1.1",
"1.8.21p2-3ubuntu1.2",
"1.8.21p2-3ubuntu1.3"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2021-3156",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "high",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-23239",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "sudo",
"binary_version": "1.8.31-1ubuntu1.2"
},
{
"binary_name": "sudo-ldap",
"binary_version": "1.8.31-1ubuntu1.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "sudo",
"purl": "pkg:deb/ubuntu/sudo@1.8.31-1ubuntu1.2?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.8.31-1ubuntu1.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.8.27-1ubuntu4",
"1.8.29-1ubuntu1",
"1.8.31-1ubuntu1",
"1.8.31-1ubuntu1.1"
]
}
],
"aliases": [],
"details": "It was discovered that Sudo incorrectly handled memory when parsing command\nlines. A local attacker could possibly use this issue to obtain unintended\naccess to the administrator account. (CVE-2021-3156)\n\nIt was discovered that the Sudo sudoedit utility incorrectly handled\nchecking directory permissions. A local attacker could possibly use this\nissue to bypass file permissions and determine if a directory exists or\nnot. (CVE-2021-23239)\n",
"id": "USN-4705-1",
"modified": "2026-04-27T14:11:26Z",
"published": "2021-01-26T18:48:16Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-4705-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-3156"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-23239"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "sudo vulnerabilities",
"upstream": [
"UBUNTU-CVE-2021-3156",
"UBUNTU-CVE-2021-23239"
]
}
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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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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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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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