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gnu: avahi: Fix CVE-2018-1000845 and duplicate CVE-2017-6519.

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* gnu/packages/avahi.scm (avahi/fixed): New variable.
(avahi)[replacement]: Use it.
* gnu/packages/patches/avahi-CVE-2018-1000845.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
This commit is contained in:
Tobias Geerinckx-Rice 2019-10-23 19:43:02 +02:00
parent dff0eedb04
commit 3f4ea9a62b
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3 changed files with 54 additions and 0 deletions
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1
gnu/local.mk
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@ -706,6 +706,7 @@ dist_patch_DATA = \
%D%/packages/patches/ath9k-htc-firmware-objcopy.patch \
%D%/packages/patches/audacity-build-with-system-portaudio.patch \
%D%/packages/patches/automake-skip-amhello-tests.patch \
%D%/packages/patches/avahi-CVE-2018-1000845.patch \
%D%/packages/patches/avahi-localstatedir.patch \
%D%/packages/patches/avogadro-boost148.patch \
%D%/packages/patches/avogadro-eigen3-update.patch \

11
gnu/packages/avahi.scm
View file

@ -35,6 +35,7 @@ (define-public avahi
(package
(name "avahi")
(version "0.7")
(replacement avahi/fixed)
(home-page "http://avahi.org")
(source (origin
(method url-fetch)
@ -74,6 +75,16 @@ (define-public avahi
DNS-SD (for \"DNS-Based Service Discovery\") protocols.")
(license lgpl2.1+)))
(define avahi/fixed
(package/inherit avahi
(source (origin
(inherit (package-source avahi))
(patches
(append (search-patches "avahi-CVE-2018-1000845.patch")
(origin-patches (package-source avahi))))))
;; Hide a duplicate of the CVE fixed above.
(properties `((lint-hidden-cve . ("CVE-2017-6519"))))))
(define-public nss-mdns
(package
(name "nss-mdns")

42
gnu/packages/patches/avahi-CVE-2018-1000845.patch Normal file
View file

@ -0,0 +1,42 @@
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 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);