Low: avahi

Issue Overview:

avahi-daemon in Avahi through 0.6.32 and 0.7 inadvertently responds to IPv6 unicast queries with source addresses that are not on-link, which allows remote attackers to cause a denial of service (traffic amplification) and may cause information leakage by obtaining potentially sensitive information from the responding device via port-5353 UDP packets. NOTE: this may overlap CVE-2015-2809. (CVE-2017-6519)

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

Additional References

Red Hat: CVE-2017-6519

Mitre: CVE-2017-6519