USN-5034-2

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Source
https://ubuntu.com/security/notices/USN-5034-2
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5034-2.json
JSON Data
https://api.osv.dev/v1/vulns/USN-5034-2
Upstream
Related
Published
2021-08-10T17:15:47.447933Z
Modified
2025-10-13T04:35:35Z
Summary
c-ares vulnerability
Details

USN-5034-1 fixed a vulnerability in c-ares. This update provides the corresponding update for Ubuntu 16.04 ESM.

Original advisory details:

Philipp Jeitner and Haya Shulman discovered that c-ares incorrectly validated certain hostnames returned by DNS servers. A remote attacker could possibly use this issue to perform Domain Hijacking attacks.

References

Affected packages

Ubuntu:Pro:16.04:LTS / c-ares

Package

Name
c-ares
Purl
pkg:deb/ubuntu/c-ares@1.10.0-3ubuntu0.2+esm1?arch=source&distro=esm-infra/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.10.0-3ubuntu0.2+esm1

Affected versions

1.*

1.10.0-2
1.10.0-3
1.10.0-3ubuntu0.1
1.10.0-3ubuntu0.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libc-ares-dev",
            "binary_version": "1.10.0-3ubuntu0.2+esm1"
        },
        {
            "binary_name": "libc-ares2",
            "binary_version": "1.10.0-3ubuntu0.2+esm1"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:Pro:16.04:LTS",
    "cves": [
        {
            "id": "CVE-2021-3672",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}