GSD-2021-27861
Vulnerability from gsd - Updated: 2023-12-13 01:23Details
Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length (and optionally VLAN0 headers)
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2021-27861",
"id": "GSD-2021-27861",
"references": [
"https://www.suse.com/security/cve/CVE-2021-27861.html"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2021-27861"
],
"details": "Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length (and optionally VLAN0 headers)",
"id": "GSD-2021-27861",
"modified": "2023-12-13T01:23:36.008885Z",
"schema_version": "1.4.0"
}
},
"namespaces": {
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"ASSIGNER": "cert@cert.org",
"DATE_PUBLIC": "2022-09-27T01:00:00.000Z",
"ID": "CVE-2021-27861",
"STATE": "PUBLIC",
"TITLE": "L2 network filtering bypass using stacked VLAN0 and LLC/SNAP headers with invalid lengths"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "802.2",
"version": {
"version_data": [
{
"version_affected": "\u003c=",
"version_name": "802.2h-1997",
"version_value": "802.2h-1997"
}
]
}
}
]
},
"vendor_name": "IEEE"
},
{
"product": {
"product_data": [
{
"product_name": "draft-ietf-v6ops-ra-guard",
"version": {
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{
"version_affected": "\u003c=",
"version_name": "08",
"version_value": "08"
}
]
}
}
]
},
"vendor_name": "IETF"
},
{
"product": {
"product_data": [
{
"product_name": "P802.1Q",
"version": {
"version_data": [
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"version_affected": "\u003c=",
"version_name": "D1.0",
"version_value": "D1.0"
}
]
}
}
]
},
"vendor_name": "IETF"
}
]
}
},
"credit": [
{
"lang": "eng",
"value": "Etienne Champetier (@champtar) \u003cchampetier.etienne@gmail.com\u003e "
}
],
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}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "CWE-130 Improper Handling of Length Parameter"
}
]
},
{
"description": [
{
"lang": "eng",
"value": "CWE-290: Authentication Bypass by Spoofing"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/",
"refsource": "MISC",
"url": "https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/"
},
{
"name": "https://standards.ieee.org/ieee/802.2/1048/",
"refsource": "MISC",
"url": "https://standards.ieee.org/ieee/802.2/1048/"
},
{
"name": "https://standards.ieee.org/ieee/802.1Q/10323/",
"refsource": "MISC",
"url": "https://standards.ieee.org/ieee/802.1Q/10323/"
},
{
"name": "https://kb.cert.org/vuls/id/855201",
"refsource": "MISC",
"url": "https://kb.cert.org/vuls/id/855201"
},
{
"name": "https://blog.champtar.fr/VLAN0_LLC_SNAP/",
"refsource": "MISC",
"url": "https://blog.champtar.fr/VLAN0_LLC_SNAP/"
}
]
},
"source": {
"discovery": "EXTERNAL"
}
},
"nvd.nist.gov": {
"configurations": {
"CVE_data_version": "4.0",
"nodes": [
{
"children": [],
"cpe_match": [
{
"cpe23Uri": "cpe:2.3:a:ieee:ieee_802.2:*:*:*:*:*:*:*:*",
"cpe_name": [],
"versionEndIncluding": "802.2h-1997",
"vulnerable": true
}
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"operator": "OR"
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{
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"cpe_match": [
{
"cpe23Uri": "cpe:2.3:a:ietf:p802.1q:*:*:*:*:*:*:*:*",
"cpe_name": [],
"versionEndIncluding": "d1.0",
"vulnerable": true
}
],
"operator": "OR"
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]
},
"cve": {
"CVE_data_meta": {
"ASSIGNER": "cert@cert.org",
"ID": "CVE-2021-27861"
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
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{
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"value": "Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length (and optionally VLAN0 headers)"
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
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"value": "CWE-290"
}
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}
]
},
"references": {
"reference_data": [
{
"name": "N/A",
"refsource": "CONFIRM",
"tags": [
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],
"url": "https://standards.ieee.org/ieee/802.2/1048/"
},
{
"name": "N/A",
"refsource": "CONFIRM",
"tags": [
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"url": "https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/"
},
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"url": "https://standards.ieee.org/ieee/802.1Q/10323/"
},
{
"name": "https://kb.cert.org/vuls/id/855201",
"refsource": "MISC",
"tags": [],
"url": "https://kb.cert.org/vuls/id/855201"
},
{
"name": "https://blog.champtar.fr/VLAN0_LLC_SNAP/",
"refsource": "MISC",
"tags": [],
"url": "https://blog.champtar.fr/VLAN0_LLC_SNAP/"
}
]
}
},
"impact": {
"baseMetricV3": {
"cvssV3": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.7,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 1.4
}
},
"lastModifiedDate": "2022-10-12T13:15Z",
"publishedDate": "2022-09-27T19:15Z"
}
}
}
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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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