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Security fix, CVE-2017-14493, DHCPv6 - Stack buffer overflow.

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Fix stack overflow in DHCPv6 code. An attacker who can send
a DHCPv6 request to dnsmasq can overflow the stack frame and
crash or control dnsmasq.
This commit is contained in:
Simon Kelley
2017-09-25 18:52:50 +01:00
parent 24036ea507
commit 3d4ff1ba84
2 changed files with 11 additions and 0 deletions
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8
CHANGELOG
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@@ -44,6 +44,14 @@ version 2.78
and Kevin Hamacher of the Google Security Team for
finding this.
Fix stack overflow in DHCPv6 code. An attacker who can send
a DHCPv6 request to dnsmasq can overflow the stack frame and
crash or control dnsmasq.
CVE-2017-14493 applies.
Credit to Felix Wilhelm, Fermin J. Serna, Gabriel Campana
and Kevin Hamacher of the Google Security Team for
finding this.
version 2.77
Generate an error when configured with a CNAME loop,

3
src/rfc3315.c
View File

@@ -206,6 +206,9 @@ static int dhcp6_maybe_relay(struct state *state, void *inbuff, size_t sz,
/* RFC-6939 */
if ((opt = opt6_find(opts, end, OPTION6_CLIENT_MAC, 3)))
{
if (opt6_len(opt) - 2 > DHCP_CHADDR_MAX) {
return 0;
}
state->mac_type = opt6_uint(opt, 0, 2);
state->mac_len = opt6_len(opt) - 2;
memcpy(&state->mac[0], opt6_ptr(opt, 2), state->mac_len);