GSD-2020-8557
Vulnerability from gsd - Updated: 2023-12-13 01:21Details
The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2020-8557",
"description": "The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.",
"id": "GSD-2020-8557",
"references": [
"https://www.suse.com/security/cve/CVE-2020-8557.html",
"https://access.redhat.com/errata/RHSA-2021:3915",
"https://access.redhat.com/errata/RHSA-2020:3809",
"https://access.redhat.com/errata/RHSA-2020:3808",
"https://access.redhat.com/errata/RHSA-2020:3580",
"https://access.redhat.com/errata/RHSA-2020:3579",
"https://access.redhat.com/errata/RHSA-2020:3520",
"https://access.redhat.com/errata/RHSA-2020:3519",
"https://linux.oracle.com/cve/CVE-2020-8557.html"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2020-8557"
],
"details": "The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.",
"id": "GSD-2020-8557",
"modified": "2023-12-13T01:21:53.615552Z",
"schema_version": "1.4.0"
}
},
"namespaces": {
"cve.org": {
"CVE_data_meta": {
"ASSIGNER": "security@kubernetes.io",
"DATE_PUBLIC": "2020-07-15T00:00:00.000Z",
"ID": "CVE-2020-8557",
"STATE": "PUBLIC",
"TITLE": "Kubernetes node disk Denial of Service by writing to container /etc/hosts"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "Kubernetes",
"version": {
"version_data": [
{
"version_affected": "\u003c",
"version_name": "1.18",
"version_value": "1.18.6"
},
{
"version_affected": "\u003c",
"version_name": "1.17",
"version_value": "1.17.9"
},
{
"version_affected": "\u003c",
"version_name": "1.16",
"version_value": "1.16.13"
},
{
"version_value": "1.15"
},
{
"version_value": "1.14"
},
{
"version_value": "1.13"
},
{
"version_value": "1.12"
},
{
"version_value": "1.11"
},
{
"version_value": "1.10"
},
{
"version_value": "1.9"
},
{
"version_value": "1.8"
},
{
"version_value": "1.7"
},
{
"version_value": "1.6"
},
{
"version_value": "1.5"
},
{
"version_value": "1.4"
},
{
"version_value": "1.3"
},
{
"version_value": "1.2"
},
{
"version_value": "1.1"
}
]
}
}
]
},
"vendor_name": "Kubernetes"
}
]
}
},
"credit": [
{
"lang": "eng",
"value": "Kebe Liu of DaoCloud"
}
],
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail."
}
]
},
"generator": {
"engine": "Vulnogram 0.0.9"
},
"impact": {
"cvss": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "CWE-400 Uncontrolled Resource Consumption"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://github.com/kubernetes/kubernetes/issues/93032",
"refsource": "CONFIRM",
"url": "https://github.com/kubernetes/kubernetes/issues/93032"
},
{
"name": "[Security Advisory] CVE-2020-8557: Node disk DOS by writing to container /etc/hosts",
"refsource": "MLIST",
"url": "https://groups.google.com/g/kubernetes-security-announce/c/cB_JUsYEKyY/m/vVSO61AhBwAJ"
},
{
"name": "https://security.netapp.com/advisory/ntap-20200821-0002/",
"refsource": "CONFIRM",
"url": "https://security.netapp.com/advisory/ntap-20200821-0002/"
}
]
},
"source": {
"discovery": "USER"
}
},
"gitlab.com": {
"advisories": [
{
"affected_range": "\u003cv1.16.13 || \u003e=v1.17.0 \u003cv1.17.9 || \u003e=v1.18.0 \u003cv1.18.6",
"affected_versions": "All versions before 1.16.13, all versions starting from 1.17.0 before 1.17.9, all versions starting from 1.18.0 before 1.18.6",
"cvss_v2": "AV:L/AC:L/Au:N/C:N/I:N/A:P",
"cvss_v3": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"cwe_ids": [
"CWE-1035",
"CWE-400",
"CWE-937"
],
"date": "2020-08-21",
"description": "The `/etc/hosts` file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the `/etc/hosts` file, it could fill the storage space of the node and cause the node to fail.",
"fixed_versions": [
"v1.16.13",
"v1.17.9",
"v1.18.6"
],
"identifier": "CVE-2020-8557",
"identifiers": [
"CVE-2020-8557"
],
"not_impacted": "All versions starting from 1.16.13 before 1.17.0, all versions starting from v1.17.9 before v1.18.0, all versions startin from v1.18.6",
"package_slug": "go/github.com/kubernetes/kubelet",
"pubdate": "2020-07-23",
"solution": "Upgrade to versions 1.16.13, 1.17.9, 1.18.6 or above.",
"title": "Uncontrolled Resource Consumption",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2020-8557"
],
"uuid": "d94d0cec-7394-4341-b127-aac8e07c79c9",
"versions": [
{
"commit": {
"sha": "151c1e40350fc26156093f2c0400eb4b60bb88e1",
"tags": [
"kubernetes-1.17.0"
],
"timestamp": "20191211003115"
},
"number": "v1.17.0"
},
{
"commit": {
"sha": "e54015b524d2efd26fc3fab5c2259e808d1d357d",
"tags": [
"kubernetes-1.18.0"
],
"timestamp": "20200326042227"
},
"number": "v1.18.0"
},
{
"commit": {
"sha": "95dded27a4045677ac882943855514319096c4d5",
"tags": [
"kubernetes-1.16.13"
],
"timestamp": "20200716002139"
},
"number": "v1.16.13"
},
{
"commit": {
"sha": "b0aaaa17b6b3f826a00ac196d007304ebf9b4d64",
"tags": [
"kubernetes-1.17.9"
],
"timestamp": "20200716002222"
},
"number": "v1.17.9"
},
{
"commit": {
"sha": "a6ba72d3025c835ddfdd437778cb9003eac3c1d0",
"tags": [
"kubernetes-1.18.6"
],
"timestamp": "20200716002306"
},
"number": "v1.18.6"
}
]
},
{
"affected_range": "\u003c1.16.13||\u003e=1.17.0 \u003c1.17.9||\u003e=1.18.0 \u003c1.18.6",
"affected_versions": "All versions before 1.16.13, all versions starting from 1.17.0 before 1.17.9, all versions starting from 1.18.0 before 1.18.6",
"cvss_v2": "AV:L/AC:L/Au:N/C:N/I:N/A:P",
"cvss_v3": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"cwe_ids": [
"CWE-1035",
"CWE-400",
"CWE-937"
],
"date": "2020-08-21",
"description": "The Kubernetes kubelet component do not account for disk usage by a pod which writes to its own `/etc/hosts` file. The `/etc/hosts` file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the `/etc/hosts` file, it could fill the storage space of the node and cause the node to fail.",
"fixed_versions": [
"1.16.13",
"1.17.9",
"1.18.6"
],
"identifier": "CVE-2020-8557",
"identifiers": [
"CVE-2020-8557"
],
"not_impacted": "All versions starting from 1.16.13 before 1.17.0, all versions starting from 1.17.9 before 1.18.0, all versions starting from 1.18.6",
"package_slug": "go/k8s.io/kubernetes/pkg/apis/apps/validation",
"pubdate": "2020-07-23",
"solution": "Upgrade to version 1.16.13, 1.17.9, 1.18.6 or above.",
"title": "Uncontrolled Resource Consumption",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2020-8557"
],
"uuid": "d3e4fe07-ce1a-40a1-8edc-148e09ecf36b"
}
]
},
"nvd.nist.gov": {
"configurations": {
"CVE_data_version": "4.0",
"nodes": [
{
"children": [],
"cpe_match": [
{
"cpe23Uri": "cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*",
"cpe_name": [],
"versionEndExcluding": "1.18.6",
"versionStartIncluding": "1.18.0",
"vulnerable": true
},
{
"cpe23Uri": "cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*",
"cpe_name": [],
"versionEndExcluding": "1.17.9",
"versionStartIncluding": "1.17.0",
"vulnerable": true
},
{
"cpe23Uri": "cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*",
"cpe_name": [],
"versionEndExcluding": "1.16.13",
"vulnerable": true
}
],
"operator": "OR"
}
]
},
"cve": {
"CVE_data_meta": {
"ASSIGNER": "security@kubernetes.io",
"ID": "CVE-2020-8557"
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
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{
"lang": "en",
"value": "The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail."
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "en",
"value": "CWE-400"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://github.com/kubernetes/kubernetes/issues/93032",
"refsource": "CONFIRM",
"tags": [
"Issue Tracking",
"Patch",
"Third Party Advisory"
],
"url": "https://github.com/kubernetes/kubernetes/issues/93032"
},
{
"name": "[Security Advisory] CVE-2020-8557: Node disk DOS by writing to container /etc/hosts",
"refsource": "MLIST",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://groups.google.com/g/kubernetes-security-announce/c/cB_JUsYEKyY/m/vVSO61AhBwAJ"
},
{
"name": "https://security.netapp.com/advisory/ntap-20200821-0002/",
"refsource": "CONFIRM",
"tags": [
"Third Party Advisory"
],
"url": "https://security.netapp.com/advisory/ntap-20200821-0002/"
}
]
}
},
"impact": {
"baseMetricV2": {
"acInsufInfo": false,
"cvssV2": {
"accessComplexity": "LOW",
"accessVector": "LOCAL",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 2.1,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:P",
"version": "2.0"
},
"exploitabilityScore": 3.9,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"severity": "LOW",
"userInteractionRequired": false
},
"baseMetricV3": {
"cvssV3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6
}
},
"lastModifiedDate": "2023-01-27T20:35Z",
"publishedDate": "2020-07-23T17:15Z"
}
}
}
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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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