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    RedHat: RHSA-2021-0245:01 Moderate: dnsmasq security update

    Date 25 Jan 2021
    136
    Posted By LinuxSecurity Advisories
    An update for dnsmasq is now available for Red Hat Enterprise Linux 7.3 Advanced Update Support. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
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    =====================================================================
                       Red Hat Security Advisory
    
    Synopsis:          Moderate: dnsmasq security update
    Advisory ID:       RHSA-2021:0245-01
    Product:           Red Hat Enterprise Linux
    Advisory URL:      https://access.redhat.com/errata/RHSA-2021:0245
    Issue date:        2021-01-25
    CVE Names:         CVE-2020-25684 CVE-2020-25685 CVE-2020-25686 
    =====================================================================
    
    1. Summary:
    
    An update for dnsmasq is now available for Red Hat Enterprise Linux 7.3
    Advanced Update Support.
    
    Red Hat Product Security has rated this update as having a security impact
    of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
    gives a detailed severity rating, is available for each vulnerability from
    the CVE link(s) in the References section.
    
    2. Relevant releases/architectures:
    
    Red Hat Enterprise Linux Server AUS (v. 7.3) - x86_64
    Red Hat Enterprise Linux Server Optional AUS (v. 7.3) - x86_64
    
    3. Description:
    
    The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name
    Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.
    
    Security Fix(es):
    
    * dnsmasq: loose address/port check in reply_query() makes forging replies
    easier for an off-path attacker (CVE-2020-25684)
    
    * dnsmasq: loose query name check in reply_query() makes forging replies
    easier for an off-path attacker (CVE-2020-25685)
    
    * dnsmasq: multiple queries forwarded for the same name makes forging
    replies easier for an off-path attacker (CVE-2020-25686)
    
    For more details about the security issue(s), including the impact, a CVSS
    score, acknowledgments, and other related information, refer to the CVE
    page(s) listed in the References section.
    
    4. Solution:
    
    For details on how to apply this update, which includes the changes
    described in this advisory, refer to:
    
    https://access.redhat.com/articles/11258
    
    5. Bugs fixed (https://bugzilla.redhat.com/):
    
    1889686 - CVE-2020-25684 dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker
    1889688 - CVE-2020-25685 dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker
    1890125 - CVE-2020-25686 dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker
    
    6. Package List:
    
    Red Hat Enterprise Linux Server AUS (v. 7.3):
    
    Source:
    dnsmasq-2.66-21.el7_3.3.src.rpm
    
    x86_64:
    dnsmasq-2.66-21.el7_3.3.x86_64.rpm
    dnsmasq-debuginfo-2.66-21.el7_3.3.x86_64.rpm
    
    Red Hat Enterprise Linux Server Optional AUS (v. 7.3):
    
    x86_64:
    dnsmasq-debuginfo-2.66-21.el7_3.3.x86_64.rpm
    dnsmasq-utils-2.66-21.el7_3.3.x86_64.rpm
    
    These packages are GPG signed by Red Hat for security.  Our key and
    details on how to verify the signature are available from
    https://access.redhat.com/security/team/key/
    
    7. References:
    
    https://access.redhat.com/security/cve/CVE-2020-25684
    https://access.redhat.com/security/cve/CVE-2020-25685
    https://access.redhat.com/security/cve/CVE-2020-25686
    https://access.redhat.com/security/updates/classification/#moderate
    https://access.redhat.com/security/vulnerabilities/RHSB-2021-001
    
    8. Contact:
    
    The Red Hat security contact is . More contact
    details at https://access.redhat.com/security/team/contact/
    
    Copyright 2021 Red Hat, Inc.
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