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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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8
CHANGELOG
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@@ -35,6 +35,14 @@ version 2.78
and Kevin Hamacher of the Google Security Team for and Kevin Hamacher of the Google Security Team for
finding this. finding this.
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.
CVE-2017-14492 applies.
Credit to Felix Wilhelm, Fermin J. Serna, Gabriel Campana
and Kevin Hamacher of the Google Security Team for
finding this.
version 2.77 version 2.77

3
src/radv.c
View File

@@ -198,6 +198,9 @@ void icmp6_packet(time_t now)
/* look for link-layer address option for logging */ /* look for link-layer address option for logging */
if (sz >= 16 && packet[8] == ICMP6_OPT_SOURCE_MAC && (packet[9] * 8) + 8 <= sz) 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); print_mac(daemon->namebuff, &packet[10], (packet[9] * 8) - 2);
mac = daemon->namebuff; mac = daemon->namebuff;
} }