diff options
Diffstat (limited to 'net-dns/avahi/files/avahi-0.7-CVE-2017-6519.patch')
| -rw-r--r-- | net-dns/avahi/files/avahi-0.7-CVE-2017-6519.patch | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/net-dns/avahi/files/avahi-0.7-CVE-2017-6519.patch b/net-dns/avahi/files/avahi-0.7-CVE-2017-6519.patch new file mode 100644 index 000000000000..5fadfbc28928 --- /dev/null +++ b/net-dns/avahi/files/avahi-0.7-CVE-2017-6519.patch @@ -0,0 +1,45 @@ +From e111def44a7df4624a4aa3f85fe98054bffb6b4f Mon Sep 17 00:00:00 2001 +From: Trent Lloyd <trent@lloyd.id.au> +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 a2cb19a..a2580e3 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. Until the day we add +@@ -947,6 +948,13 @@ static void dispatch_packet(AvahiServer *s, AvahiDnsPacket *p, const AvahiAddres + legacy_unicast = 1; + } + ++ if (!is_mdns_mcast_address(dst_address) && ++ !avahi_interface_address_on_link(i, src_address)) { ++ ++ avahi_log_debug("Received non-local unicast query from host %s on interface '%s.%i'.", avahi_address_snprint(t, sizeof(t), src_address), i->hardware->name, i->protocol); ++ return; ++ } ++ + if (legacy_unicast) + reflect_legacy_unicast_query_packet(s, p, i, src_address, port); + +-- +2.21.0 + |