Medium: avahi

Issue Overview:

A flaw was found in avahi in versions 0.6 up to 0.8. The event used to signal the termination of the client connection on the avahi Unix socket is not correctly handled in the client_work function, allowing a local attacker to trigger an infinite loop. The highest threat from this vulnerability is to the availability of the avahi service, which becomes unresponsive after this flaw is triggered. (CVE-2021-3468)

Affected Packages:

avahi

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update avahi to update your system.

New Packages:

aarch64:  
    avahi-0.6.31-20.amzn2.0.3.aarch64  
    avahi-tools-0.6.31-20.amzn2.0.3.aarch64  
    avahi-ui-tools-0.6.31-20.amzn2.0.3.aarch64  
    avahi-glib-0.6.31-20.amzn2.0.3.aarch64  
    avahi-glib-devel-0.6.31-20.amzn2.0.3.aarch64  
    avahi-gobject-0.6.31-20.amzn2.0.3.aarch64  
    avahi-gobject-devel-0.6.31-20.amzn2.0.3.aarch64  
    avahi-ui-0.6.31-20.amzn2.0.3.aarch64  
    avahi-ui-gtk3-0.6.31-20.amzn2.0.3.aarch64  
    avahi-ui-devel-0.6.31-20.amzn2.0.3.aarch64  
    avahi-qt3-0.6.31-20.amzn2.0.3.aarch64  
    avahi-qt3-devel-0.6.31-20.amzn2.0.3.aarch64  
    avahi-qt4-0.6.31-20.amzn2.0.3.aarch64  
    avahi-qt4-devel-0.6.31-20.amzn2.0.3.aarch64  
    avahi-libs-0.6.31-20.amzn2.0.3.aarch64  
    avahi-devel-0.6.31-20.amzn2.0.3.aarch64  
    avahi-compat-howl-0.6.31-20.amzn2.0.3.aarch64  
    avahi-compat-howl-devel-0.6.31-20.amzn2.0.3.aarch64  
    avahi-compat-libdns_sd-0.6.31-20.amzn2.0.3.aarch64  
    avahi-compat-libdns_sd-devel-0.6.31-20.amzn2.0.3.aarch64  
    avahi-autoipd-0.6.31-20.amzn2.0.3.aarch64  
    avahi-dnsconfd-0.6.31-20.amzn2.0.3.aarch64  
    avahi-debuginfo-0.6.31-20.amzn2.0.3.aarch64  
  
i686:  
    avahi-0.6.31-20.amzn2.0.3.i686  
    avahi-tools-0.6.31-20.amzn2.0.3.i686  
    avahi-ui-tools-0.6.31-20.amzn2.0.3.i686  
    avahi-glib-0.6.31-20.amzn2.0.3.i686  
    avahi-glib-devel-0.6.31-20.amzn2.0.3.i686  
    avahi-gobject-0.6.31-20.amzn2.0.3.i686  
    avahi-gobject-devel-0.6.31-20.amzn2.0.3.i686  
    avahi-ui-0.6.31-20.amzn2.0.3.i686  
    avahi-ui-gtk3-0.6.31-20.amzn2.0.3.i686  
    avahi-ui-devel-0.6.31-20.amzn2.0.3.i686  
    avahi-qt3-0.6.31-20.amzn2.0.3.i686  
    avahi-qt3-devel-0.6.31-20.amzn2.0.3.i686  
    avahi-qt4-0.6.31-20.amzn2.0.3.i686  
    avahi-qt4-devel-0.6.31-20.amzn2.0.3.i686  
    avahi-libs-0.6.31-20.amzn2.0.3.i686  
    avahi-devel-0.6.31-20.amzn2.0.3.i686  
    avahi-compat-howl-0.6.31-20.amzn2.0.3.i686  
    avahi-compat-howl-devel-0.6.31-20.amzn2.0.3.i686  
    avahi-compat-libdns_sd-0.6.31-20.amzn2.0.3.i686  
    avahi-compat-libdns_sd-devel-0.6.31-20.amzn2.0.3.i686  
    avahi-autoipd-0.6.31-20.amzn2.0.3.i686  
    avahi-dnsconfd-0.6.31-20.amzn2.0.3.i686  
    avahi-debuginfo-0.6.31-20.amzn2.0.3.i686  
  
src:  
    avahi-0.6.31-20.amzn2.0.3.src  
  
x86_64:  
    avahi-0.6.31-20.amzn2.0.3.x86_64  
    avahi-tools-0.6.31-20.amzn2.0.3.x86_64  
    avahi-ui-tools-0.6.31-20.amzn2.0.3.x86_64  
    avahi-glib-0.6.31-20.amzn2.0.3.x86_64  
    avahi-glib-devel-0.6.31-20.amzn2.0.3.x86_64  
    avahi-gobject-0.6.31-20.amzn2.0.3.x86_64  
    avahi-gobject-devel-0.6.31-20.amzn2.0.3.x86_64  
    avahi-ui-0.6.31-20.amzn2.0.3.x86_64  
    avahi-ui-gtk3-0.6.31-20.amzn2.0.3.x86_64  
    avahi-ui-devel-0.6.31-20.amzn2.0.3.x86_64  
    avahi-qt3-0.6.31-20.amzn2.0.3.x86_64  
    avahi-qt3-devel-0.6.31-20.amzn2.0.3.x86_64  
    avahi-qt4-0.6.31-20.amzn2.0.3.x86_64  
    avahi-qt4-devel-0.6.31-20.amzn2.0.3.x86_64  
    avahi-libs-0.6.31-20.amzn2.0.3.x86_64  
    avahi-devel-0.6.31-20.amzn2.0.3.x86_64  
    avahi-compat-howl-0.6.31-20.amzn2.0.3.x86_64  
    avahi-compat-howl-devel-0.6.31-20.amzn2.0.3.x86_64  
    avahi-compat-libdns_sd-0.6.31-20.amzn2.0.3.x86_64  
    avahi-compat-libdns_sd-devel-0.6.31-20.amzn2.0.3.x86_64  
    avahi-autoipd-0.6.31-20.amzn2.0.3.x86_64  
    avahi-dnsconfd-0.6.31-20.amzn2.0.3.x86_64  
    avahi-debuginfo-0.6.31-20.amzn2.0.3.x86_64  

Additional References

Red Hat: CVE-2021-3468

Mitre: CVE-2021-3468