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Security fix, CVE-2017-14494, Infoleak handling DHCPv6 forwarded requests.

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Fix information leak in DHCPv6. A crafted DHCPv6 packet can
    cause dnsmasq to forward memory from outside the packet
    buffer to a DHCPv6 server when acting as a relay.

Signed-off-by: Petr Menšík <pemensik@redhat.com>
This commit is contained in:
Petr Menšík 2017-09-26 17:55:20 +02:00
parent e84d4fc50e
commit e66c11835d
2 changed files with 33 additions and 0 deletions
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30
dnsmasq-2.77-CVE-2017-14494.patch Normal file
View File

@ -0,0 +1,30 @@
From 33e3f1029c9ec6c63e430ff51063a6301d4b2262 Mon Sep 17 00:00:00 2001
From: Simon Kelley <simon@thekelleys.org.uk>
Date: Mon, 25 Sep 2017 20:05:11 +0100
Subject: [PATCH 5/9] Security fix, CVE-2017-14494, Infoleak handling DHCPv6
forwarded requests.
Fix information leak in DHCPv6. A crafted DHCPv6 packet can
cause dnsmasq to forward memory from outside the packet
buffer to a DHCPv6 server when acting as a relay.
---
src/rfc3315.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/src/rfc3315.c b/src/rfc3315.c
index 920907c..4ca43e0 100644
--- a/src/rfc3315.c
+++ b/src/rfc3315.c
@@ -216,6 +216,9 @@ static int dhcp6_maybe_relay(struct state *state, void *inbuff, size_t sz,
for (opt = opts; opt; opt = opt6_next(opt, end))
{
+ if (opt6_ptr(opt, 0) + opt6_len(opt) >= end) {
+ return 0;
+ }
int o = new_opt6(opt6_type(opt));
if (opt6_type(opt) == OPTION6_RELAY_MSG)
{
--
2.9.5

3
dnsmasq.spec
View File

@ -26,6 +26,7 @@ Patch1: dnsmasq-2.77-CVE-2017-13704.patch
Patch2: dnsmasq-2.77-CVE-2017-14491.patch
Patch3: dnsmasq-2.77-CVE-2017-14492.patch
Patch4: dnsmasq-2.77-CVE-2017-14493.patch
Patch5: dnsmasq-2.77-CVE-2017-14494.patch
BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
@ -64,6 +65,7 @@ query/remove a DHCP server's leases.
%patch2 -p1 -b .CVE-2017-14491
%patch3 -p1 -b .CVE-2017-14492
%patch4 -p1 -b .CVE-2017-14493
%patch5 -p1 -b .CVE-2017-14494
# 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
@ -154,6 +156,7 @@ rm -rf $RPM_BUILD_ROOT
- Security fix, CVE-2017-14491, DNS heap buffer overflow
- Security fix, CVE-2017-14492, DHCPv6 RA heap overflow
- Security fix, CVE-2017-14493, DHCPv6 - Stack buffer overflow
- Security fix, CVE-2017-14494, Infoleak handling DHCPv6
* Thu Sep 14 2017 Petr Menšík <pemensik@redhat.com> - 2.77-7
- Fix CVE-2017-13704