MGASA-2021-0231

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    MGASA-2021-0231

    Published: 8 Jun 2021Last Modified: 16 Apr 2026
    Upstream:
    CVE-2021-3448

    Summary: Updated dnsmasq packages fix a security vulnerability

    Details: A flaw was found in dnsmasq in versions before 2.85. When configured to use a specific server for a given network interface, dnsmasq uses a fixed port while forwarding queries. An attacker on the network, able to find the outgoing port used by dnsmasq, only needs to guess the random transmission ID to forge a reply and get it accepted by dnsmasq. This flaw makes a DNS Cache Poisoning attack much easier (CVE-2021-3448). This kind of configuration is the default when network-manager uses dnsmasq.

    References: https://advisories.mageia.org/MGASA-2021-0231.html, https://bugs.mageia.org/show_bug.cgi?id=29030, https://bugzilla.redhat.com/show_bug.cgi?id=1939368, https://lists.fedoraproject.org/archives/list/[email protected]/thread/GHURNEHHUBSW45KMIZ4FNBCSUPWPGV5V/

    Affected packages

    Package

    Name: dnsmasq

    Purl: pkg:rpm/mageia/dnsmasq?arch=source&distro=mageia-7

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.85-1.mga7

    Affected versions

    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
    MGASA-2021-0231 | CVE-DB