USN-5034-2

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    USN-5034-2

    Published: 10 Aug 2021Last Modified: 25 Jun 2026

    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: https://ubuntu.com/security/notices/USN-5034-2, https://ubuntu.com/security/CVE-2021-3672

    Affected packages

    Package

    Name: c-ares

    Purl: pkg:deb/ubuntu/c-ares?arch=source&distro=esm-infra%2Fxenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.10.0-3ubuntu0.2+esm1

    Affected versions

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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    USN-5034-2 | CVE-DB