msrc_cve-2021-23017
Vulnerability from csaf_microsoft
Published
2021-06-02 00:00
Modified
2021-06-11 00:00
Summary
A security issue in nginx resolver was identified which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite resulting in worker process crash or potential other impact.
Notes
Additional Resources
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer
The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
{
"document": {
"category": "csaf_vex",
"csaf_version": "2.0",
"distribution": {
"text": "Public",
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
}
},
"lang": "en-US",
"notes": [
{
"category": "general",
"text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
"title": "Additional Resources"
},
{
"category": "legal_disclaimer",
"text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
"title": "Disclaimer"
}
],
"publisher": {
"category": "vendor",
"contact_details": "secure@microsoft.com",
"name": "Microsoft Security Response Center",
"namespace": "https://msrc.microsoft.com"
},
"references": [
{
"category": "self",
"summary": "CVE-2021-23017 A security issue in nginx resolver was identified which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite resulting in worker process crash or potential other impact. - VEX",
"url": "https://msrc.microsoft.com/csaf/vex/2021/msrc_cve-2021-23017.json"
},
{
"category": "external",
"summary": "Microsoft Support Lifecycle",
"url": "https://support.microsoft.com/lifecycle"
},
{
"category": "external",
"summary": "Common Vulnerability Scoring System",
"url": "https://www.first.org/cvss"
}
],
"title": "A security issue in nginx resolver was identified which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite resulting in worker process crash or potential other impact.",
"tracking": {
"current_release_date": "2021-06-11T00:00:00.000Z",
"generator": {
"date": "2025-10-19T22:02:44.740Z",
"engine": {
"name": "MSRC Generator",
"version": "1.0"
}
},
"id": "msrc_CVE-2021-23017",
"initial_release_date": "2021-06-02T00:00:00.000Z",
"revision_history": [
{
"date": "2021-06-11T00:00:00.000Z",
"legacy_version": "1",
"number": "1",
"summary": "Information published."
}
],
"status": "final",
"version": "1"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"category": "product_version",
"name": "1.0",
"product": {
"name": "CBL Mariner 1.0",
"product_id": "16820"
}
}
],
"category": "product_name",
"name": "Azure Linux"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003ccm1 nginx 1.20.1-1",
"product": {
"name": "\u003ccm1 nginx 1.20.1-1",
"product_id": "1"
}
},
{
"category": "product_version",
"name": "cm1 nginx 1.20.1-1",
"product": {
"name": "cm1 nginx 1.20.1-1",
"product_id": "17079"
}
}
],
"category": "product_name",
"name": "nginx"
}
],
"category": "vendor",
"name": "Microsoft"
}
],
"relationships": [
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ccm1 nginx 1.20.1-1 as a component of CBL Mariner 1.0",
"product_id": "16820-1"
},
"product_reference": "1",
"relates_to_product_reference": "16820"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "cm1 nginx 1.20.1-1 as a component of CBL Mariner 1.0",
"product_id": "17079-16820"
},
"product_reference": "17079",
"relates_to_product_reference": "16820"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2021-23017",
"cwe": {
"id": "CWE-193",
"name": "Off-by-one Error"
},
"notes": [
{
"category": "general",
"text": "f5",
"title": "Assigning CNA"
}
],
"product_status": {
"fixed": [
"17079-16820"
],
"known_affected": [
"16820-1"
]
},
"references": [
{
"category": "self",
"summary": "CVE-2021-23017 A security issue in nginx resolver was identified which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite resulting in worker process crash or potential other impact. - VEX",
"url": "https://msrc.microsoft.com/csaf/vex/2021/msrc_cve-2021-23017.json"
}
],
"remediations": [
{
"category": "vendor_fix",
"date": "2021-06-11T00:00:00.000Z",
"details": "1.20.1-1:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
"product_ids": [
"16820-1"
],
"url": "https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 7.7,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"environmentalsScore": 0.0,
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"temporalScore": 7.7,
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
"version": "3.1"
},
"products": [
"16820-1"
]
}
],
"title": "A security issue in nginx resolver was identified which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite resulting in worker process crash or potential other impact."
}
]
}
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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.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- 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.
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