Security update for squid3 (important)

This update for squid3 fixes the following issues:

• Multiple issues in pinger ICMP processing. (CVE-2014-7141,
  CVE-2014-7142)

• CVE-2016-3947: Buffer overrun issue in pinger ICMPv6 processing.
  (bsc#973782)

• CVE-2016-4554: fix header smuggling issue in HTTP Request processing
  (bsc#979010)

• Fix multiple Denial of Service issues in HTTP Response processing.
  (CVE-2016-2569, CVE-2016-2570, CVE-2016-2571, CVE-2016-2572, bsc#968392,
  bsc#968393, bsc#968394, bsc#968395)

• Regression caused by the DoS fixes above (bsc#993299)

• CVE-2016-3948: Fix denial of service in HTTP Response processing
  (bsc#973783)

• CVE-2016-4051: fixes buffer overflow in cachemgr.cgi (bsc#976553)

• CVE-2016-4052, CVE-2016-4053, CVE-2016-4054:

  • fixes multiple issues in ESI processing (bsc#976556)

• CVE-2016-4556: fixes double free vulnerability in Esi.cc (bsc#979008)

• CVE-2015-5400: Improper Protection of Alternate Path (bsc#938715)

• CVE-2014-6270: fix off-by-one in snmp subsystem (bsc#895773)

• Memory leak in squid3 when using external_acl (bsc#976708)