gsd-2020-8562
Vulnerability from gsd
Modified
2023-12-13 01:21
Details
As mitigations to a report from 2019 and CVE-2020-8555, Kubernetes attempts to prevent proxied connections from accessing link-local or localhost networks when making user-driven connections to Services, Pods, Nodes, or StorageClass service providers. As part of this mitigation Kubernetes does a DNS name resolution check and validates that response IPs are not in the link-local (169.254.0.0/16) or localhost (127.0.0.0/8) range. Kubernetes then performs a second DNS resolution without validation for the actual connection. If a non-standard DNS server returns different non-cached responses, a user may be able to bypass the proxy IP restriction and access private networks on the control plane.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2020-8562",
"description": "As mitigations to a report from 2019 and CVE-2020-8555, Kubernetes attempts to prevent proxied connections from accessing link-local or localhost networks when making user-driven connections to Services, Pods, Nodes, or StorageClass service providers. As part of this mitigation Kubernetes does a DNS name resolution check and validates that response IPs are not in the link-local (169.254.0.0/16) or localhost (127.0.0.0/8) range. Kubernetes then performs a second DNS resolution without validation for the actual connection. If a non-standard DNS server returns different non-cached responses, a user may be able to bypass the proxy IP restriction and access private networks on the control plane.",
"id": "GSD-2020-8562",
"references": [
"https://www.suse.com/security/cve/CVE-2020-8562.html",
"https://security.archlinux.org/CVE-2020-8562"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2020-8562"
],
"details": "As mitigations to a report from 2019 and CVE-2020-8555, Kubernetes attempts to prevent proxied connections from accessing link-local or localhost networks when making user-driven connections to Services, Pods, Nodes, or StorageClass service providers. As part of this mitigation Kubernetes does a DNS name resolution check and validates that response IPs are not in the link-local (169.254.0.0/16) or localhost (127.0.0.0/8) range. Kubernetes then performs a second DNS resolution without validation for the actual connection. If a non-standard DNS server returns different non-cached responses, a user may be able to bypass the proxy IP restriction and access private networks on the control plane.",
"id": "GSD-2020-8562",
"modified": "2023-12-13T01:21:53.364157Z",
"schema_version": "1.4.0"
}
},
"namespaces": {
"cve.org": {
"CVE_data_meta": {
"ASSIGNER": "security@kubernetes.io",
"DATE_PUBLIC": "2021-05-04T16:51:00.000Z",
"ID": "CVE-2020-8562",
"STATE": "PUBLIC",
"TITLE": "Bypass of Kubernetes API Server proxy TOCTOU"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "Kubernetes",
"version": {
"version_data": [
{
"version_affected": "\u003c=",
"version_value": "v1.18.18"
},
{
"version_affected": "?\u003e",
"version_value": "v1.18.18"
},
{
"version_affected": "\u003c=",
"version_value": "v1.19.10"
},
{
"version_affected": "?\u003e",
"version_value": "v1.19.10"
},
{
"version_affected": "\u003c=",
"version_value": "v1.20.6"
},
{
"version_affected": "?\u003e",
"version_value": "v1.20.6"
},
{
"version_affected": "\u003c=",
"version_value": "v1.21.0"
},
{
"version_affected": "?\u003e",
"version_value": "v1.21.0"
}
]
}
}
]
},
"vendor_name": "Kubernetes"
}
]
}
},
"credit": [
{
"lang": "eng",
"value": "Javier Provecho"
}
],
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "As mitigations to a report from 2019 and CVE-2020-8555, Kubernetes attempts to prevent proxied connections from accessing link-local or localhost networks when making user-driven connections to Services, Pods, Nodes, or StorageClass service providers. As part of this mitigation Kubernetes does a DNS name resolution check and validates that response IPs are not in the link-local (169.254.0.0/16) or localhost (127.0.0.0/8) range. Kubernetes then performs a second DNS resolution without validation for the actual connection. If a non-standard DNS server returns different non-cached responses, a user may be able to bypass the proxy IP restriction and access private networks on the control plane."
}
]
},
"generator": {
"engine": "Vulnogram 0.0.9"
},
"impact": {
"cvss": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 2.2,
"baseSeverity": "LOW",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
}
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://github.com/kubernetes/kubernetes/issues/101493",
"refsource": "MISC",
"url": "https://github.com/kubernetes/kubernetes/issues/101493"
},
{
"name": "https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY",
"refsource": "MISC",
"url": "https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY"
},
{
"name": "https://security.netapp.com/advisory/ntap-20220225-0002/",
"refsource": "CONFIRM",
"url": "https://security.netapp.com/advisory/ntap-20220225-0002/"
}
]
},
"source": {
"defect": [
"https://github.com/kubernetes/kubernetes/issues/101493"
],
"discovery": "EXTERNAL"
},
"work_around": [
{
"lang": "eng",
"value": "If this issue affects your clusters\u2019 control planes, you can use dnsmasq for name resolution and configure the min-cache-ttl and neg-ttl parameters to a low non-zero value to enforce cached replies for proxied connections"
}
]
},
"gitlab.com": {
"advisories": [
{
"affected_range": "\u003e=1.21.0 \u003c1.21.1||\u003e=1.20.0 \u003c1.20.7||\u003e=1.19.0 \u003c1.19.11||\u003c1.18.19",
"affected_versions": "All versions starting from 1.21.0 before 1.21.1, all versions starting from 1.20.0 before 1.20.7, all versions starting from 1.19.0 before 1.19.11, all versions before 1.18.19",
"cvss_v2": "AV:N/AC:M/Au:S/C:P/I:N/A:N",
"cvss_v3": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
"cwe_ids": [
"CWE-1035",
"CWE-367",
"CWE-937"
],
"date": "2022-02-11",
"description": "As mitigations to a report from 2019 and CVE-2020-8555, Kubernetes attempts to prevent proxied connections from accessing link-local or localhost networks when making user-driven connections to Services, Pods, Nodes, or StorageClass service providers. As part of this mitigation Kubernetes does a DNS name resolution check and validates that response IPs are not in the link-local (169.254.0.0/16) or localhost (127.0.0.0/8) range. Kubernetes then performs a second DNS resolution without validation for the actual connection. If a non-standard DNS server returns different non-cached responses, a user may be able to bypass the proxy IP restriction and access private networks on the control plane.",
"fixed_versions": [
"1.21.1",
"1.21.1",
"1.19.11",
"1.18.19",
"1.18.19"
],
"identifier": "CVE-2020-8562",
"identifiers": [
"GHSA-qh36-44jv-c8xj",
"CVE-2020-8562"
],
"not_impacted": "All versions before 1.21.0, all versions starting from 1.21.1, all versions before 1.20.0, all versions starting from 1.20.7, all versions before 1.19.0, all versions starting from 1.18.19 before 1.19.11",
"package_slug": "go/k8s.io/kubernetes",
"pubdate": "2022-02-02",
"solution": "Upgrade to versions 1.21.1, 1.21.1, 1.19.11, 1.18.19, 1.18.19 or above.",
"title": "Time-of-check Time-of-use (TOCTOU) Race Condition",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2020-8562",
"https://github.com/kubernetes/kubernetes/issues/101493",
"https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY",
"https://github.com/advisories/GHSA-qh36-44jv-c8xj"
],
"uuid": "1b421428-da20-49dc-8920-6d0473cc8e4b"
}
]
},
"nvd.nist.gov": {
"configurations": {
"CVE_data_version": "4.0",
"nodes": [
{
"children": [],
"cpe_match": [
{
"cpe23Uri": "cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*",
"cpe_name": [],
"versionEndIncluding": "1.18.18",
"vulnerable": true
},
{
"cpe23Uri": "cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*",
"cpe_name": [],
"versionEndIncluding": "1.19.10",
"versionStartIncluding": "1.19.0",
"vulnerable": true
},
{
"cpe23Uri": "cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*",
"cpe_name": [],
"versionEndIncluding": "1.20.6",
"versionStartIncluding": "1.20.0",
"vulnerable": true
},
{
"cpe23Uri": "cpe:2.3:a:kubernetes:kubernetes:1.21.0:*:*:*:*:*:*:*",
"cpe_name": [],
"vulnerable": true
}
],
"operator": "OR"
}
]
},
"cve": {
"CVE_data_meta": {
"ASSIGNER": "security@kubernetes.io",
"ID": "CVE-2020-8562"
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "en",
"value": "As mitigations to a report from 2019 and CVE-2020-8555, Kubernetes attempts to prevent proxied connections from accessing link-local or localhost networks when making user-driven connections to Services, Pods, Nodes, or StorageClass service providers. As part of this mitigation Kubernetes does a DNS name resolution check and validates that response IPs are not in the link-local (169.254.0.0/16) or localhost (127.0.0.0/8) range. Kubernetes then performs a second DNS resolution without validation for the actual connection. If a non-standard DNS server returns different non-cached responses, a user may be able to bypass the proxy IP restriction and access private networks on the control plane."
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "en",
"value": "CWE-367"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY",
"refsource": "MISC",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY"
},
{
"name": "https://github.com/kubernetes/kubernetes/issues/101493",
"refsource": "MISC",
"tags": [
"Issue Tracking",
"Mitigation",
"Third Party Advisory"
],
"url": "https://github.com/kubernetes/kubernetes/issues/101493"
},
{
"name": "https://security.netapp.com/advisory/ntap-20220225-0002/",
"refsource": "CONFIRM",
"tags": [
"Third Party Advisory"
],
"url": "https://security.netapp.com/advisory/ntap-20220225-0002/"
}
]
}
},
"impact": {
"baseMetricV2": {
"acInsufInfo": false,
"cvssV2": {
"accessComplexity": "MEDIUM",
"accessVector": "NETWORK",
"authentication": "SINGLE",
"availabilityImpact": "NONE",
"baseScore": 3.5,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:M/Au:S/C:P/I:N/A:N",
"version": "2.0"
},
"exploitabilityScore": 6.8,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"severity": "LOW",
"userInteractionRequired": false
},
"baseMetricV3": {
"cvssV3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.1,
"baseSeverity": "LOW",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
},
"exploitabilityScore": 1.6,
"impactScore": 1.4
}
},
"lastModifiedDate": "2022-03-29T16:35Z",
"publishedDate": "2022-02-01T11:15Z"
}
}
}
Loading...
Loading...
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.