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Date: Tue, 27 Nov 2018 13:11:05 +0100
From: Krzysztof Burghardt <>
Subject: Avahi 0.7 missing link-local checks in Legacy Unicast Responses cause
 information disclosure and makes DDoS with mDNS traffic reflection possible


Avahi-daemon in Avahi through 0.7 inadvertently sends Legacy Unicast
Responses to IPv4 unicast queries with source addresses that are not
link-local, which allows remote attackers to cause a denial of service
(traffic amplification) or obtain potentially sensitive information
via port-5353 UDP packets.

dport=5353)/DNS(rd=1,qd=DNSQR(qtype="PTR", qname="_ssh._tcp.local.")))

Author was notified by his bug tracker:

Krzysztof Burghardt <>

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