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OpenAdvisories
Medium ALSA-2023:6707 3 CVEs

Moderate: avahi security update

Published Nov 7, 2023 · Updated Oct 29, 2026

Summary

Avahi is an implementation of the DNS Service Discovery and Multicast DNS specifications for Zero Configuration Networking. It facilitates service discovery on a local network. Avahi and Avahi-aware applications allow you to plug your computer into a network and, with no configuration, view other people to chat with, view printers to print with, and find shared files on other computers.

Security Fix(es):

* avahi: Local DoS by event-busy-loop from writing long lines to /run/avahi-daemon/socket (CVE-2021-3468)
* avahi: reachable assertion in avahi_s_host_name_resolver_start when trying to resolve badly-formatted hostnames (CVE-2021-3502)
* avahi: avahi-daemon can be crashed via DBus (CVE-2023-1981)

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.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

Fixed packages 10

ReleasePackageFixed in
AlmaLinux · 9 avahi 0.8-15.el9
AlmaLinux · 9 avahi-compat-howl 0.8-15.el9
AlmaLinux · 9 avahi-compat-howl-devel 0.8-15.el9
AlmaLinux · 9 avahi-compat-libdns_sd 0.8-15.el9
AlmaLinux · 9 avahi-compat-libdns_sd-devel 0.8-15.el9
AlmaLinux · 9 avahi-devel 0.8-15.el9
AlmaLinux · 9 avahi-glib 0.8-15.el9
AlmaLinux · 9 avahi-glib-devel 0.8-15.el9
AlmaLinux · 9 avahi-libs 0.8-15.el9
AlmaLinux · 9 avahi-tools 0.8-15.el9

Vulnerabilities 3

References

  • report
    https://access.redhat.com/security/cve/CVE-2021-3468
  • report
    https://access.redhat.com/security/cve/CVE-2021-3502
  • report
    https://access.redhat.com/security/cve/CVE-2023-1981
  • report
    https://bugzilla.redhat.com/1939614
  • report
    https://bugzilla.redhat.com/1946914
  • report
    https://bugzilla.redhat.com/2185911
  • advisory
    https://errata.almalinux.org/9/ALSA-2023-6707.html