==========================================================================
Ubuntu Security Notice USN-3557-1
February 05, 2018

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

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

- Ubuntu 17.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in Squid.

Software Description:
- squid3: Web proxy cache server

Details:

Mathias Fischer discovered that Squid incorrectly handled certain long
strings in headers. A malicious remote server could possibly cause Squid to
crash, resulting in a denial of service. This issue was only addressed in
Ubuntu 16.04 LTS. (CVE-2016-2569)

William Lima discovered that Squid incorrectly handled XML parsing when
processing Edge Side Includes (ESI). A malicious remote server could
possibly cause Squid to crash, resulting in a denial of service. This issue
was only addressed in Ubuntu 16.04 LTS. (CVE-2016-2570)

Alex Rousskov discovered that Squid incorrectly handled response-parsing
failures. A malicious remote server could possibly cause Squid to crash,
resulting in a denial of service. This issue only applied to Ubuntu 16.04
LTS. (CVE-2016-2571)

Santiago Ruano RincA3n discovered that Squid incorrectly handled certain
Vary headers. A remote attacker could possibly use this issue to cause
Squid to crash, resulting in a denial of service. This issue was only
addressed in Ubuntu 16.04 LTS. (CVE-2016-3948)

Louis Dion-Marcil discovered that Squid incorrectly handled certain Edge
Side Includes (ESI) responses. A malicious remote server could possibly
cause Squid to crash, resulting in a denial of service. (CVE-2018-1000024)

Louis Dion-Marcil discovered that Squid incorrectly handled certain Edge
Side Includes (ESI) responses. A malicious remote server could possibly
cause Squid to crash, resulting in a denial of service. (CVE-2018-1000027)

Update instructions:

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

Ubuntu 17.10:
  squid3                          3.5.23-5ubuntu1.1

Ubuntu 16.04 LTS:
  squid3                          3.5.12-1ubuntu7.5

Ubuntu 14.04 LTS:
  squid3                          3.3.8-1ubuntu6.11

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

References:
  https://www.ubuntu.com/usn/usn-3557-1
  CVE-2016-2569, CVE-2016-2570, CVE-2016-2571, CVE-2016-3948,
  CVE-2018-1000024, CVE-2018-1000027

Package Information:
  https://launchpad.net/ubuntu/+source/squid3/3.5.23-5ubuntu1.1
  https://launchpad.net/ubuntu/+source/squid3/3.5.12-1ubuntu7.5
  https://launchpad.net/ubuntu/+source/squid3/3.3.8-1ubuntu6.11