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Ubuntu Security Notice USN-4065-1
July 18, 2019

squid, squid3 vulnerabilities
==========================================================================

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

- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Squid.

Software Description:
- squid: Web proxy cache server
- squid3: Web proxy cache server

Details:

It was discovered that Squid incorrectly handled Digest authentication. A
remote attacker could possibly use this issue to cause Squid to crash,
resulting in a denial of service. (CVE-2019-12525)

It was discovered that Squid incorrectly handled Basic authentication. A
remote attacker could use this issue to cause Squid to crash, resulting in
a denial of service, or possibly execute arbitrary code. This issue only
affected Ubuntu 19.04. (CVE-2019-12527)

It was discovered that Squid incorrectly handled Basic authentication. A
remote attacker could possibly use this issue to cause Squid to crash,
resulting in a denial of service. (CVE-2019-12529)

Update instructions:

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

Ubuntu 19.04:
  squid                           4.4-1ubuntu2.2

Ubuntu 18.04 LTS:
  squid3                          3.5.27-1ubuntu1.3

Ubuntu 16.04 LTS:
  squid3                          3.5.12-1ubuntu7.8

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

References:
  https://usn.ubuntu.com/4065-1
  CVE-2019-12525, CVE-2019-12527, CVE-2019-12529

Package Information:
  https://launchpad.net/ubuntu/+source/squid/4.4-1ubuntu2.2
  https://launchpad.net/ubuntu/+source/squid3/3.5.27-1ubuntu1.3
  https://launchpad.net/ubuntu/+source/squid3/3.5.12-1ubuntu7.8