From e111def44a7df4624a4aa3f85fe98054bffb6b4f Mon Sep 17 00:00:00 2001 From: Trent Lloyd Date: Sat, 22 Dec 2018 09:06:07 +0800 Subject: [PATCH] Drop legacy unicast queries from address not on local link When handling legacy unicast queries, ensure that the source IP is inside a subnet on the local link, otherwise drop the packet. Fixes #145 Fixes #203 CVE-2017-6519 CVE-2018-100084 --- avahi-core/server.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/avahi-core/server.c b/avahi-core/server.c index a2cb19a8..a2580e38 100644 --- a/avahi-core/server.c +++ b/avahi-core/server.c @@ -930,6 +930,7 @@ static void dispatch_packet(AvahiServer *s, AvahiDnsPacket *p, const AvahiAddres if (avahi_dns_packet_is_query(p)) { int legacy_unicast = 0; + char t[AVAHI_ADDRESS_STR_MAX]; /* For queries EDNS0 might allow ARCOUNT != 0. We ignore the * AR section completely here, so far. Unti
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