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Security fix, CVE-2017-14492, DHCPv6 RA heap overflow.

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Fix heap overflow in IPv6 router advertisement code.
This is a potentially serious security hole, as a
crafted RA request can overflow a buffer and crash or
control dnsmasq. Attacker must be on the local network.

Signed-off-by: Petr Menšík <pemensik@redhat.com>
This commit is contained in:
Petr Menšík 2017-09-26 17:48:44 +02:00
parent bd80bf435e
commit 2daf3ff20f
2 changed files with 33 additions and 0 deletions
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30
dnsmasq-2.77-CVE-2017-14492.patch Normal file
View File

@ -0,0 +1,30 @@
From 24036ea507862c7b7898b68289c8130f85599c10 Mon Sep 17 00:00:00 2001
From: Simon Kelley <simon@thekelleys.org.uk>
Date: Mon, 25 Sep 2017 18:47:15 +0100
Subject: [PATCH 3/9] Security fix, CVE-2017-14492, DHCPv6 RA heap overflow.
Fix heap overflow in IPv6 router advertisement code.
This is a potentially serious security hole, as a
crafted RA request can overflow a buffer and crash or
control dnsmasq. Attacker must be on the local network.
---
src/radv.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/src/radv.c b/src/radv.c
index 1032189..9b7e52c 100644
--- a/src/radv.c
+++ b/src/radv.c
@@ -198,6 +198,9 @@ void icmp6_packet(time_t now)
/* look for link-layer address option for logging */
if (sz >= 16 && packet[8] == ICMP6_OPT_SOURCE_MAC && (packet[9] * 8) + 8 <= sz)
{
+ if ((packet[9] * 8 - 2) * 3 - 1 >= MAXDNAME) {
+ return;
+ }
print_mac(daemon->namebuff, &packet[10], (packet[9] * 8) - 2);
mac = daemon->namebuff;
}
--
2.9.5

3
dnsmasq.spec
View File

@ -24,6 +24,7 @@ Source1: %{name}.service
Patch1: dnsmasq-2.77-CVE-2017-13704.patch
Patch2: dnsmasq-2.77-CVE-2017-14491.patch
Patch3: dnsmasq-2.77-CVE-2017-14492.patch
BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
@ -60,6 +61,7 @@ query/remove a DHCP server's leases.
%setup -q -n %{name}-%{version}%{?extraversion}
%patch1 -p1 -b .CVE-2017-13704
%patch2 -p1 -b .CVE-2017-14491
%patch3 -p1 -b .CVE-2017-14492
# use /var/lib/dnsmasq instead of /var/lib/misc
for file in dnsmasq.conf.example man/dnsmasq.8 man/es/dnsmasq.8 src/config.h; do
@ -148,6 +150,7 @@ rm -rf $RPM_BUILD_ROOT
%changelog
* Mon Oct 02 2017 Petr Menšík <pemensik@redhat.com> - 2.77-8
- Security fix, CVE-2017-14491 DNS heap buffer overflow
- Security fix, CVE-2017-14492 DHCPv6 RA heap overflow
* Thu Sep 14 2017 Petr Menšík <pemensik@redhat.com> - 2.77-7
- Fix CVE-2017-13704