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authorGravatar Artem Panfilov <panfilov.artyom@gmail.com>2019-03-13 02:46:51 +0300
committerGravatar Peter Korsgaard <peter@korsgaard.com>2019-03-25 21:21:22 +0100
commit46f6b048ecad5a11d755f374048166ef78604f3d (patch)
tree1dc27b5a3b608489c47076ad7863cfc5c1c90080
parent1a0cee96f23e60cd5bbf90c111fe6328536ba2bb (diff)
downloadbuildroot-46f6b048ecad5a11d755f374048166ef78604f3d.tar.gz
buildroot-46f6b048ecad5a11d755f374048166ef78604f3d.tar.bz2
package/avahi: add upstream security fix
Fixes CVE-2017-6519: avahi-daemon in Avahi through 0.6.32 and 0.7 inadvertently responds to IPv6 unicast queries with source addresses that are not on-link, which allows remote attackers to cause a denial of service (traffic amplification) and may cause information leakage by obtaining potentially sensitive information from the responding device via port-5353 UDP packets. Signed-off-by: Artem Panfilov <panfilov.artyom@gmail.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> (cherry picked from commit 1e17adf1c5ee1cecd747f84fff8f6261c1e8a476) Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
-rw-r--r--package/avahi/0001-Drop-legacy-unicast-queries-from-address-not-on-loca.patch48
1 files changed, 48 insertions, 0 deletions
diff --git a/package/avahi/0001-Drop-legacy-unicast-queries-from-address-not-on-loca.patch b/package/avahi/0001-Drop-legacy-unicast-queries-from-address-not-on-loca.patch
new file mode 100644
index 0000000000..0e8408c830
--- /dev/null
+++ b/package/avahi/0001-Drop-legacy-unicast-queries-from-address-not-on-loca.patch
@@ -0,0 +1,48 @@
+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
+
+Backported from: e111def44a7df4624a4aa3f85fe98054bffb6b4f
+Signed-off-by: Artem Panfilov <panfilov.artyom@gmail.com>
+---
+ 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. 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);
+
+--
+2.19.1
+