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32 lines
1006 B
32 lines
1006 B
7 years ago
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From c14b8b511ac55f6933aebefbd6cc27c1ec74ad58 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 18:47:15 +0100
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Subject: [PATCH 2/9] Security fix, CVE-2017-14492, DHCPv6 RA heap
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overflow.
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Fix heap overflow in IPv6 router advertisement code.
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This is a potentially serious security hole, as a
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crafted RA request can overflow a buffer and crash or
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control dnsmasq. Attacker must be on the local network.
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---
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src/radv.c | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/src/radv.c b/src/radv.c
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index 749b666..d09fe0e 100644
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--- a/src/radv.c
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+++ b/src/radv.c
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@@ -198,6 +198,9 @@ void icmp6_packet(time_t now)
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/* look for link-layer address option for logging */
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if (sz >= 16 && packet[8] == ICMP6_OPT_SOURCE_MAC && (packet[9] * 8) + 8 <= sz)
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{
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+ if ((packet[9] * 8 - 2) * 3 - 1 >= MAXDNAME) {
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+ return;
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+ }
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print_mac(daemon->namebuff, &packet[10], (packet[9] * 8) - 2);
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mac = daemon->namebuff;
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}
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--
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2.9.5
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