USN-4969-2

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Source
https://ubuntu.com/security/notices/USN-4969-2
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4969-2.json
JSON Data
https://api.osv.dev/v1/vulns/USN-4969-2
Upstream
Related
Published
2021-05-27T12:07:22.939807Z
Modified
2025-10-13T04:35:30Z
Summary
isc-dhcp vulnerability
Details

USN-4969-1 fixed a vulnerability in DHCP. This update provides the corresponding update for Ubuntu 14.04 ESM and 16.04 ESM.

Original advisory details:

Jon Franklin and Pawel Wieczorkiewicz discovered that DHCP incorrectly handled lease file parsing. A remote attacker could possibly use this issue to cause DHCP to crash, resulting in a denial of service.

References

Affected packages

Ubuntu:Pro:14.04:LTS / isc-dhcp

Package

Name
isc-dhcp
Purl
pkg:deb/ubuntu/isc-dhcp@4.2.4-7ubuntu12.13+esm1?arch=source&distro=trusty/esm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.2.4-7ubuntu12.13+esm1

Affected versions

4.*

4.2.4-7ubuntu8
4.2.4-7ubuntu9
4.2.4-7ubuntu10
4.2.4-7ubuntu11
4.2.4-7ubuntu12
4.2.4-7ubuntu12.1
4.2.4-7ubuntu12.2
4.2.4-7ubuntu12.3
4.2.4-7ubuntu12.4
4.2.4-7ubuntu12.5
4.2.4-7ubuntu12.6
4.2.4-7ubuntu12.7
4.2.4-7ubuntu12.8
4.2.4-7ubuntu12.9
4.2.4-7ubuntu12.10
4.2.4-7ubuntu12.12
4.2.4-7ubuntu12.13

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "4.2.4-7ubuntu12.13+esm1",
            "binary_name": "isc-dhcp-client"
        },
        {
            "binary_version": "4.2.4-7ubuntu12.13+esm1",
            "binary_name": "isc-dhcp-client-noddns"
        },
        {
            "binary_version": "4.2.4-7ubuntu12.13+esm1",
            "binary_name": "isc-dhcp-common"
        },
        {
            "binary_version": "4.2.4-7ubuntu12.13+esm1",
            "binary_name": "isc-dhcp-dev"
        },
        {
            "binary_version": "4.2.4-7ubuntu12.13+esm1",
            "binary_name": "isc-dhcp-relay"
        },
        {
            "binary_version": "4.2.4-7ubuntu12.13+esm1",
            "binary_name": "isc-dhcp-server"
        },
        {
            "binary_version": "4.2.4-7ubuntu12.13+esm1",
            "binary_name": "isc-dhcp-server-ldap"
        }
    ]
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:Pro:14.04:LTS",
    "cves": [
        {
            "id": "CVE-2021-25217",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}

Ubuntu:Pro:16.04:LTS / isc-dhcp

Package

Name
isc-dhcp
Purl
pkg:deb/ubuntu/isc-dhcp@4.3.3-5ubuntu12.10+esm1?arch=source&distro=esm-infra/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.3.3-5ubuntu12.10+esm1

Affected versions

4.*

4.3.1-5ubuntu3
4.3.1-5ubuntu4
4.3.1-5ubuntu5
4.3.3-5ubuntu1
4.3.3-5ubuntu2
4.3.3-5ubuntu4
4.3.3-5ubuntu5
4.3.3-5ubuntu7
4.3.3-5ubuntu8
4.3.3-5ubuntu9
4.3.3-5ubuntu10
4.3.3-5ubuntu11
4.3.3-5ubuntu12
4.3.3-5ubuntu12.1
4.3.3-5ubuntu12.3
4.3.3-5ubuntu12.4
4.3.3-5ubuntu12.6
4.3.3-5ubuntu12.7
4.3.3-5ubuntu12.9
4.3.3-5ubuntu12.10

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "4.3.3-5ubuntu12.10+esm1",
            "binary_name": "isc-dhcp-client"
        },
        {
            "binary_version": "4.3.3-5ubuntu12.10+esm1",
            "binary_name": "isc-dhcp-client-ddns"
        },
        {
            "binary_version": "4.3.3-5ubuntu12.10+esm1",
            "binary_name": "isc-dhcp-common"
        },
        {
            "binary_version": "4.3.3-5ubuntu12.10+esm1",
            "binary_name": "isc-dhcp-dev"
        },
        {
            "binary_version": "4.3.3-5ubuntu12.10+esm1",
            "binary_name": "isc-dhcp-relay"
        },
        {
            "binary_version": "4.3.3-5ubuntu12.10+esm1",
            "binary_name": "isc-dhcp-server"
        },
        {
            "binary_version": "4.3.3-5ubuntu12.10+esm1",
            "binary_name": "isc-dhcp-server-ldap"
        }
    ]
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:Pro:16.04:LTS",
    "cves": [
        {
            "id": "CVE-2021-25217",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}