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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.
This commit is contained in:
Simon Kelley
2017-09-25 20:05:11 +01:00
parent 3d4ff1ba84
commit 33e3f1029c
2 changed files with 11 additions and 0 deletions
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8
CHANGELOG
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@@ -51,6 +51,14 @@ version 2.78
Credit to Felix Wilhelm, Fermin J. Serna, Gabriel Campana
and Kevin Hamacher of the Google Security Team for
finding this.
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.
CVE-2017-14494 applies.
Credit to Felix Wilhelm, Fermin J. Serna, Gabriel Campana
and Kevin Hamacher of the Google Security Team for
finding this.
version 2.77

3
src/rfc3315.c
View File

@@ -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)
{