dns_internal.cc in Squid 3.1.6, when IPv6 DNS resolution is not enabled,
accesses an invalid socket during an IPv4 TCP DNS query, which allows
remote attackers to cause a denial of service (assertion failure and daemon
exit) via vectors that trigger an IPv4 DNS response with the TC bit set.
jdstrand> per upstream, 3.1 only
Updated: 2016-01-26 17:36:52 UTC (commit 10507)