[USN-2995-1] Squid vulnerabilities

[Marc Deslauriers]

==========================================================================
Ubuntu Security Notice USN-2995-1
June 09, 2016

squid3 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS
- Ubuntu 15.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in Squid.

Software Description:
- squid3: Web proxy cache server

Details:

Yuriy M. Kaminskiy discovered that the Squid pinger utility incorrectly
handled certain ICMPv6 packets. A remote attacker could use this issue to
cause Squid to crash, resulting in a denial of service, or possibly cause
Squid to leak information into log files. (CVE-2016-3947)

Yuriy M. Kaminskiy discovered that the Squid cachemgr.cgi tool incorrectly
handled certain crafted data. A remote attacker could use this issue to
cause Squid to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2016-4051)

It was discovered that Squid incorrectly handled certain Edge Side Includes
(ESI) responses. A remote attacker could possibly use this issue to cause
Squid to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2016-4052, CVE-2016-4053, CVE-2016-4054)

Jianjun Chen discovered that Squid did not correctly ignore the Host header
when absolute-URI is provided. A remote attacker could possibly use this
issue to conduct cache-poisoning attacks. This issue only affected Ubuntu
14.04 LTS, Ubuntu 15.10 and Ubuntu 16.04 LTS. (CVE-2016-4553)

Jianjun Chen discovered that Squid incorrectly handled certain HTTP Host
headers. A remote attacker could possibly use this issue to conduct
cache-poisoning attacks. (CVE-2016-4554)

It was discovered that Squid incorrectly handled certain Edge Side Includes
(ESI) responses. A remote attacker could possibly use this issue to cause
Squid to crash, resulting in a denial of service. (CVE-2016-4555,
CVE-2016-4556)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 LTS:
  squid-cgi                       3.5.12-1ubuntu7.2
  squid3                          3.5.12-1ubuntu7.2

Ubuntu 15.10:
  squid-cgi                       3.3.8-1ubuntu16.3
  squid3                          3.3.8-1ubuntu16.3

Ubuntu 14.04 LTS:
  squid-cgi                       3.3.8-1ubuntu6.8
  squid3                          3.3.8-1ubuntu6.8

Ubuntu 12.04 LTS:
  squid-cgi                       3.1.19-1ubuntu3.12.04.7
  squid3                          3.1.19-1ubuntu3.12.04.7

In general, a standard system update will make all the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-2995-1
  CVE-2016-3947, CVE-2016-4051, CVE-2016-4052, CVE-2016-4053,
  CVE-2016-4054, CVE-2016-4553, CVE-2016-4554, CVE-2016-4555,
  CVE-2016-4556

Package Information:
  https://launchpad.net/ubuntu/+source/squid3/3.5.12-1ubuntu7.2
  https://launchpad.net/ubuntu/+source/squid3/3.3.8-1ubuntu16.3
  https://launchpad.net/ubuntu/+source/squid3/3.3.8-1ubuntu6.8
  https://launchpad.net/ubuntu/+source/squid3/3.1.19-1ubuntu3.12.04.7


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