usn-4992-1
Vulnerability from osv_ubuntu
Published
2021-06-18 03:57
Modified
2026-04-27 14:11
Summary
grub2-signed, grub2-unsigned vulnerabilities
Details
Máté Kukri discovered that the acpi command in GRUB 2 allowed privileged users to load crafted ACPI tables when secure boot is enabled. An attacker could use this to bypass UEFI Secure Boot restrictions. (CVE-2020-14372)
Chris Coulson discovered that the rmmod command in GRUB 2 contained a use- after-free vulnerability. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-25632)
Chris Coulson discovered that a buffer overflow existed in the command line parser in GRUB 2. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-27749)
It was discovered that the cutmem command in GRUB 2 did not honor secure boot locking. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-27779)
It was discovered that the option parser in GRUB 2 contained a heap overflow vulnerability. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2021-20225)
It was discovered that the menu rendering implementation in GRUB 2 did not properly calculate the amount of memory needed in some situations, leading to out-of-bounds writes. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2021-20233)
References
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2020-14372",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2020-25632",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2020-27749",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2020-27779",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-20225",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-20233",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "grub-efi-amd64-signed",
"binary_version": "1.167~18.04.5+2.04-1ubuntu44.1.2"
},
{
"binary_name": "grub-efi-arm64-signed",
"binary_version": "1.167~18.04.5+2.04-1ubuntu44.1.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "grub2-signed",
"purl": "pkg:deb/ubuntu/grub2-signed@1.167~18.04.5?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.167~18.04.5"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.85",
"1.86",
"1.87",
"1.89",
"1.91",
"1.92",
"1.93",
"1.93.1",
"1.93.2",
"1.93.3",
"1.93.4",
"1.93.5",
"1.93.7",
"1.93.8",
"1.93.10",
"1.93.11",
"1.93.13",
"1.93.14",
"1.93.15",
"1.93.16",
"1.93.18",
"1.93.19",
"1.93.20",
"1.93.21",
"1.93.22",
"1.93.24",
"1.167~18.04.1",
"1.167~18.04.3"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2020-14372",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2020-25632",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2020-27749",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2020-27779",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-20225",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-20233",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "grub-efi-amd64",
"binary_version": "2.04-1ubuntu44.1.2"
},
{
"binary_name": "grub-efi-amd64-bin",
"binary_version": "2.04-1ubuntu44.1.2"
},
{
"binary_name": "grub-efi-arm64",
"binary_version": "2.04-1ubuntu44.1.2"
},
{
"binary_name": "grub-efi-arm64-bin",
"binary_version": "2.04-1ubuntu44.1.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "grub2-unsigned",
"purl": "pkg:deb/ubuntu/grub2-unsigned@2.04-1ubuntu44.1.2?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.04-1ubuntu44.1.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.04-1ubuntu44",
"2.04-1ubuntu44.1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2020-14372",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2020-25632",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2020-27749",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2020-27779",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-20225",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-20233",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "grub-efi-amd64-signed",
"binary_version": "1.167.2+2.04-1ubuntu44.2"
},
{
"binary_name": "grub-efi-arm64-signed",
"binary_version": "1.167.2+2.04-1ubuntu44.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "grub2-signed",
"purl": "pkg:deb/ubuntu/grub2-signed@1.167.2?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.167.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.128",
"1.129",
"1.130",
"1.131",
"1.133",
"1.134",
"1.135",
"1.136",
"1.137",
"1.138",
"1.139",
"1.140",
"1.141",
"1.142",
"1.142.1",
"1.142.3",
"1.142.4",
"1.142.5",
"1.142.6",
"1.142.8",
"1.142.9",
"1.142.10",
"1.142.11",
"1.167"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2020-14372",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2020-25632",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2020-27749",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2020-27779",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-20225",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-20233",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "grub-efi-amd64",
"binary_version": "2.04-1ubuntu44.2"
},
{
"binary_name": "grub-efi-amd64-bin",
"binary_version": "2.04-1ubuntu44.2"
},
{
"binary_name": "grub-efi-arm64",
"binary_version": "2.04-1ubuntu44.2"
},
{
"binary_name": "grub-efi-arm64-bin",
"binary_version": "2.04-1ubuntu44.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "grub2-unsigned",
"purl": "pkg:deb/ubuntu/grub2-unsigned@2.04-1ubuntu44.2?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.04-1ubuntu44.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.04-1ubuntu44"
]
}
],
"aliases": [],
"details": "M\u00e1t\u00e9 Kukri discovered that the acpi command in GRUB 2 allowed privileged\nusers to load crafted ACPI tables when secure boot is enabled. An attacker\ncould use this to bypass UEFI Secure Boot restrictions. (CVE-2020-14372)\n\nChris Coulson discovered that the rmmod command in GRUB 2 contained a use-\nafter-free vulnerability. A local attacker could use this to execute\narbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-25632)\n\nChris Coulson discovered that a buffer overflow existed in the command line\nparser in GRUB 2. A local attacker could use this to execute arbitrary code\nand bypass UEFI Secure Boot restrictions. (CVE-2020-27749)\n\nIt was discovered that the cutmem command in GRUB 2 did not honor secure\nboot locking. A local attacker could use this to execute arbitrary code and\nbypass UEFI Secure Boot restrictions. (CVE-2020-27779)\n\nIt was discovered that the option parser in GRUB 2 contained a heap\noverflow vulnerability. A local attacker could use this to execute\narbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2021-20225)\n\nIt was discovered that the menu rendering implementation in GRUB 2 did not\nproperly calculate the amount of memory needed in some situations, leading\nto out-of-bounds writes. A local attacker could use this to execute\narbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2021-20233)\n",
"id": "USN-4992-1",
"modified": "2026-04-27T14:11:27Z",
"published": "2021-06-18T03:57:46Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-4992-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2020-14372"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2020-25632"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2020-27749"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2020-27779"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-20225"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-20233"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "grub2-signed, grub2-unsigned vulnerabilities",
"upstream": [
"UBUNTU-CVE-2020-14372",
"UBUNTU-CVE-2020-25632",
"UBUNTU-CVE-2020-27749",
"UBUNTU-CVE-2020-27779",
"UBUNTU-CVE-2021-20225",
"UBUNTU-CVE-2021-20233"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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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