RHSA-2021:2278
Vulnerability from csaf_redhat - Published: 2021-06-07 17:59 - Updated: 2026-01-13 21:16Summary
Red Hat Security Advisory: rh-nginx116-nginx security update
Severity
Important
Notes
Topic: An update for rh-nginx116-nginx is now available for Red Hat Software Collections.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: nginx is a web and proxy server supporting HTTP and other protocols, with a focus on high concurrency, performance, and low memory usage.
Security Fix(es):
* nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a pointer to a root domain name (CVE-2021-23017)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in nginx. An off-by-one error while processing DNS responses allows a network attacker to write a dot character out of bounds in a heap allocated buffer which can allow overwriting the least significant byte of next heap chunk metadata likely leading to a remote code execution in certain circumstances. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
8.1 (High)
Affected products
Fixed
66 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-1:1.16.1-6.el7.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-debuginfo-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-debuginfo-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-debuginfo-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-mod-http-image-filter-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-mod-http-image-filter-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-mod-http-image-filter-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-mod-http-perl-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-mod-http-perl-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-mod-http-perl-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-mod-http-xslt-filter-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-mod-http-xslt-filter-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-mod-http-xslt-filter-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-mod-mail-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-mod-mail-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-mod-mail-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-mod-stream-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-mod-stream-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7-7.7.Z:rh-nginx116-nginx-mod-stream-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-1:1.16.1-6.el7.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-debuginfo-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-debuginfo-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-debuginfo-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-mod-http-image-filter-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-mod-http-image-filter-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-mod-http-image-filter-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-mod-http-perl-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-mod-http-perl-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-mod-http-perl-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-mod-http-xslt-filter-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-mod-http-xslt-filter-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-mod-http-xslt-filter-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-mod-mail-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-mod-mail-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-mod-mail-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-mod-stream-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-mod-stream-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Server-RHSCL-3.7:rh-nginx116-nginx-mod-stream-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-1:1.16.1-6.el7.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-debuginfo-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-debuginfo-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-debuginfo-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-mod-http-image-filter-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-mod-http-image-filter-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-mod-http-image-filter-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-mod-http-perl-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-mod-http-perl-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-mod-http-perl-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-mod-http-xslt-filter-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-mod-http-xslt-filter-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-mod-http-xslt-filter-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-mod-mail-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-mod-mail-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-mod-mail-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-mod-stream-1:1.16.1-6.el7.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-mod-stream-1:1.16.1-6.el7.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: 7Workstation-RHSCL-3.7:rh-nginx116-nginx-mod-stream-1:1.16.1-6.el7.x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Important
References
8 references
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"cve": "CVE-2021-23017",
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"name": "Off-by-one Error"
},
"discovery_date": "2021-05-19T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1963121"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in nginx. An off-by-one error while processing DNS responses allows a network attacker to write a dot character out of bounds in a heap allocated buffer which can allow overwriting the least significant byte of next heap chunk metadata likely leading to a remote code execution in certain circumstances. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a pointer to a root domain name",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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},
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},
{
"category": "external",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-23017"
}
],
"release_date": "2021-05-25T00:00:00+00:00",
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"category": "vendor_fix",
"date": "2021-06-07T17:59:31+00:00",
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{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a pointer to a root domain name"
}
]
}
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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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