USN-4967-1

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Source
https://ubuntu.com/security/notices/USN-4967-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4967-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-4967-1
Upstream
Related
Published
2021-05-26T13:50:49.029312Z
Modified
2025-10-13T04:35:30Z
Summary
nginx vulnerability
Details

Luis Merino, Markus Vervier, and Eric Sesterhenn discovered that nginx incorrectly handled responses to the DNS resolver. A remote attacker could use this issue to cause nginx to crash, resulting in a denial of service, or possibly execute arbitrary code.

References

Affected packages

Ubuntu:18.04:LTS / nginx

Package

Name
nginx
Purl
pkg:deb/ubuntu/nginx@1.14.0-0ubuntu1.9?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.14.0-0ubuntu1.9

Affected versions

1.*

1.12.1-0ubuntu2
1.13.6-2ubuntu1
1.13.6-2ubuntu2
1.13.10-1ubuntu1
1.13.12-0ubuntu1
1.14.0-0ubuntu1
1.14.0-0ubuntu1.1
1.14.0-0ubuntu1.2
1.14.0-0ubuntu1.3
1.14.0-0ubuntu1.4
1.14.0-0ubuntu1.5
1.14.0-0ubuntu1.6
1.14.0-0ubuntu1.7

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-http-auth-pam"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-http-cache-purge"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-http-dav-ext"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-http-echo"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-http-fancyindex"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-http-geoip"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-http-headers-more-filter"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-http-image-filter"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-http-lua"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-http-ndk"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-http-perl"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-http-subs-filter"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-http-uploadprogress"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-http-upstream-fair"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-http-xslt-filter"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-mail"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-nchan"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-rtmp"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "libnginx-mod-stream"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "nginx"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "nginx-common"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "nginx-core"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "nginx-extras"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "nginx-full"
        },
        {
            "binary_version": "1.14.0-0ubuntu1.9",
            "binary_name": "nginx-light"
        }
    ]
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:18.04:LTS",
    "cves": [
        {
            "id": "CVE-2021-23017",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}

Ubuntu:20.04:LTS / nginx

Package

Name
nginx
Purl
pkg:deb/ubuntu/nginx@1.18.0-0ubuntu1.2?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.18.0-0ubuntu1.2

Affected versions

1.*

1.16.1-0ubuntu2
1.16.1-0ubuntu3
1.17.5-0ubuntu1
1.17.6-0ubuntu1
1.17.7-0ubuntu1
1.17.8-0ubuntu1
1.17.8-0ubuntu2
1.17.8-0ubuntu3
1.17.9-0ubuntu1
1.17.9-0ubuntu2
1.17.9-0ubuntu3
1.17.10-0ubuntu1
1.18.0-0ubuntu1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-http-auth-pam"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-http-cache-purge"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-http-dav-ext"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-http-echo"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-http-fancyindex"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-http-geoip"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-http-geoip2"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-http-headers-more-filter"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-http-image-filter"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-http-lua"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-http-ndk"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-http-perl"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-http-subs-filter"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-http-uploadprogress"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-http-upstream-fair"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-http-xslt-filter"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-mail"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-nchan"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-rtmp"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "libnginx-mod-stream"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "nginx"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "nginx-common"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "nginx-core"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "nginx-extras"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "nginx-full"
        },
        {
            "binary_version": "1.18.0-0ubuntu1.2",
            "binary_name": "nginx-light"
        }
    ]
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:20.04:LTS",
    "cves": [
        {
            "id": "CVE-2021-23017",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}