UBUNTU-CVE-2023-50387

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    UBUNTU-CVE-2023-50387

    Published: 13 Feb 2024Last Modified: 6 Oct 2026
    Upstream:
    CVE-2023-50387
    Aliases:
    USN-6633-1
    USN-6642-1
    USN-6657-1

    Summary:

    Details: Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.

    References: https://ubuntu.com/security/CVE-2023-50387, https://kb.isc.org/docs/cve-2023-50387, https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html, https://www.knot-resolver.cz/2024-02-13-knot-resolver-5.7.1.html, https://blog.powerdns.com/2024/02/13/powerdns-recursor-4-8-6-4-9-3-5-0-2-released, https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/, https://nlnetlabs.nl/downloads/unbound/CVE-2023-50387_CVE-2023-50868.txt, https://ubuntu.com/security/notices/USN-6633-1, https://ubuntu.com/security/notices/USN-6642-1, https://ubuntu.com/security/notices/USN-6657-1, https://ubuntu.com/security/notices/USN-6665-1, https://ubuntu.com/security/notices/USN-6723-1, https://www.cve.org/CVERecord?id=CVE-2023-50387, https://ubuntu.com/security/notices/USN-6657-2

    Affected packages

    Package

    Name: bind9

    Purl: pkg:deb/ubuntu/bind9?arch=source&distro=trusty%2Fesm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1:9.9.5.dfsg-3ubuntu0.19+esm12

    Affected versions

    1:9.9.3.dfsg.P2-4ubuntu1
    1:9.9.3.dfsg.P2-4ubuntu2
    1:9.9.3.dfsg.P2-4ubuntu3
    1:9.9.5.dfsg-2
    1:9.9.5.dfsg-3
    1:9.9.5.dfsg-3ubuntu0.1
    1:9.9.5.dfsg-3ubuntu0.2
    1:9.9.5.dfsg-3ubuntu0.3
    1:9.9.5.dfsg-3ubuntu0.4
    1:9.9.5.dfsg-3ubuntu0.5
    1:9.9.5.dfsg-3ubuntu0.6
    1:9.9.5.dfsg-3ubuntu0.7
    1:9.9.5.dfsg-3ubuntu0.8
    1:9.9.5.dfsg-3ubuntu0.9
    1:9.9.5.dfsg-3ubuntu0.10
    1:9.9.5.dfsg-3ubuntu0.11
    1:9.9.5.dfsg-3ubuntu0.12
    1:9.9.5.dfsg-3ubuntu0.13
    1:9.9.5.dfsg-3ubuntu0.14
    1:9.9.5.dfsg-3ubuntu0.15
    1:9.9.5.dfsg-3ubuntu0.16
    1:9.9.5.dfsg-3ubuntu0.17
    1:9.9.5.dfsg-3ubuntu0.18
    1:9.9.5.dfsg-3ubuntu0.19
    1:9.9.5.dfsg-3ubuntu0.19+esm1
    1:9.9.5.dfsg-3ubuntu0.19+esm2
    1:9.9.5.dfsg-3ubuntu0.19+esm3
    1:9.9.5.dfsg-3ubuntu0.19+esm4
    1:9.9.5.dfsg-3ubuntu0.19+esm5
    1:9.9.5.dfsg-3ubuntu0.19+esm6
    1:9.9.5.dfsg-3ubuntu0.19+esm7
    1:9.9.5.dfsg-3ubuntu0.19+esm9
    1:9.9.5.dfsg-3ubuntu0.19+esm10
    1:9.9.5.dfsg-3ubuntu0.19+esm11

    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
    UBUNTU-CVE-2023-50387 | CVE-DB