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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.
This commit is contained in:
Simon Kelley
2017-09-25 18:47:15 +01:00
parent 0549c73b7e
commit 24036ea507
2 changed files with 12 additions and 1 deletions
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3
src/radv.c
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@@ -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;
}