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31 lines
952 B
31 lines
952 B
7 years ago
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From 8c8fe650dc17aad0fbafc920fde719218dc4568d Mon Sep 17 00:00:00 2001
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From: Simon Kelley <simon@thekelleys.org.uk>
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Date: Mon, 25 Sep 2017 20:05:11 +0100
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Subject: [PATCH 4/9] Security fix, CVE-2017-14494, Infoleak handling
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DHCPv6 forwarded requests.
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Fix information leak in DHCPv6. A crafted DHCPv6 packet can
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cause dnsmasq to forward memory from outside the packet
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buffer to a DHCPv6 server when acting as a relay.
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---
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src/rfc3315.c | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/src/rfc3315.c b/src/rfc3315.c
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index 8d18a28..03b3f84 100644
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--- a/src/rfc3315.c
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+++ b/src/rfc3315.c
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@@ -216,6 +216,9 @@ static int dhcp6_maybe_relay(struct state *state, void *inbuff, size_t sz,
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for (opt = opts; opt; opt = opt6_next(opt, end))
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{
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+ if (opt6_ptr(opt, 0) + opt6_len(opt) >= end) {
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+ return 0;
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+ }
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int o = new_opt6(opt6_type(opt));
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if (opt6_type(opt) == OPTION6_RELAY_MSG)
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{
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--
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2.9.5
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