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High ALSA-2024:1789 6 CVEs

Important: bind security update

Published Apr 11, 2024 · Updated Oct 29, 2026

Ecosystem: AlmaLinux

Summary

The Berkeley Internet Name Domain (BIND) is an implementation of the Domain Name System (DNS) protocols. BIND includes a DNS server (named); a resolver library (routines for applications to use when interfacing with DNS); and tools for verifying that the DNS server is operating correctly.

Security Fix(es):

* bind: Preparing an NSEC3 closest encloser proof can exhaust CPU resources (CVE-2023-50868)
* bind: KeyTrap - Extreme CPU consumption in DNSSEC validator (CVE-2023-50387)
* bind: Specific recursive query patterns may lead to an out-of-memory condition (CVE-2023-6516)
* bind: Enabling both DNS64 and serve-stale may cause an assertion failure during recursive resolution (CVE-2023-5679)
* bind: Querying RFC 1918 reverse zones may cause an assertion failure when “nxdomain-redirect” is enabled (CVE-2023-5517)
* bind: Parsing large DNS messages may cause excessive CPU load (CVE-2023-4408)

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.

Fixed packages 11

ReleasePackageFixed in
AlmaLinux · 9 bind 32:9.16.23-14.el9_3.4
AlmaLinux · 9 bind-chroot 32:9.16.23-14.el9_3.4
AlmaLinux · 9 bind-devel 32:9.16.23-14.el9_3.4
AlmaLinux · 9 bind-dnssec-doc 32:9.16.23-14.el9_3.4
AlmaLinux · 9 bind-dnssec-utils 32:9.16.23-14.el9_3.4
AlmaLinux · 9 bind-doc 32:9.16.23-14.el9_3.4
AlmaLinux · 9 bind-dyndb-ldap 11.9-8.el9_3.3.alma.1
AlmaLinux · 9 bind-libs 32:9.16.23-14.el9_3.4
AlmaLinux · 9 bind-license 32:9.16.23-14.el9_3.4
AlmaLinux · 9 bind-utils 32:9.16.23-14.el9_3.4
AlmaLinux · 9 python3-bind 32:9.16.23-14.el9_3.4

Vulnerabilities 6

  • High 7.5
    CVE-2023-4408

    Parsing large DNS messages may cause excessive CPU load

    The DNS message parsing code in `named` includes a section whose computational complexity is overly high. It does not cause problems for typical DNS traffic, but crafted queries and responses may cause excessive CPU load on the affected `named` instance by ex…

    ISC BIND 9 bind9 bind9 Debian Ubuntu Azure Linux Alpine Wolfi
  • High 7.5
    CVE-2023-50387 Public exploit EPSS 100%

    Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to …

    bind9 bind9 bind unbound Debian Ubuntu Azure Linux Alpine Wolfi
  • High 7.5
    CVE-2023-50868 Public exploit EPSS 74%

    The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote att…

    bind9 bind9 bind unbound Debian Ubuntu Azure Linux Alpine Wolfi
  • High 7.5
    CVE-2023-5517

    Querying RFC 1918 reverse zones may cause an assertion failure when "nxdomain-redirect" is enabled

    A flaw in query-handling code can cause `named` to exit prematurely with an assertion failure when: - `nxdomain-redirect <domain>;` is configured, and - the resolver receives a PTR query for an RFC 1918 address that would normally result in an authoritative N…

    ISC BIND 9 bind9 bind9 Debian Ubuntu Azure Linux Alpine Wolfi
  • High 7.5
    CVE-2023-5679

    Enabling both DNS64 and serve-stale may cause an assertion failure during recursive resolution

    A bad interaction between DNS64 and serve-stale may cause `named` to crash with an assertion failure during recursive resolution, when both of these features are enabled. This issue affects BIND 9 versions 9.16.12 through 9.16.45, 9.18.0 through 9.18.21, 9.19…

    ISC BIND 9 bind9 bind9 Debian Ubuntu Azure Linux Alpine Wolfi
  • High 7.5
    CVE-2023-6516

    Specific recursive query patterns may lead to an out-of-memory condition

    To keep its cache database efficient, `named` running as a recursive resolver occasionally attempts to clean up the database. It uses several methods, including some that are asynchronous: a small chunk of memory pointing to the cache element that can be clea…

    ISC BIND 9 bind9 bind9 Debian Ubuntu Azure Linux Alpine Wolfi

References

  • report
    https://access.redhat.com/security/cve/CVE-2023-4408
  • report
    https://access.redhat.com/security/cve/CVE-2023-50387
  • report
    https://access.redhat.com/security/cve/CVE-2023-50868
  • report
    https://access.redhat.com/security/cve/CVE-2023-5517
  • report
    https://access.redhat.com/security/cve/CVE-2023-5679
  • report
    https://access.redhat.com/security/cve/CVE-2023-6516
  • report
    https://bugzilla.redhat.com/2263896
  • report
    https://bugzilla.redhat.com/2263897
  • report
    https://bugzilla.redhat.com/2263909
  • report
    https://bugzilla.redhat.com/2263911
  • report
    https://bugzilla.redhat.com/2263914
  • report
    https://bugzilla.redhat.com/2263917
  • advisory
    https://errata.almalinux.org/9/ALSA-2024-1789.html