==========================================================================
Ubuntu Security Notice USN-4289-1
February 20, 2020

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

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

- Ubuntu 19.10
- 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:

Jeriko One discovered that Squid incorrectly handled memory when connected
to an FTP server. A remote attacker could possibly use this issue to obtain
sensitive information from Squid memory. (CVE-2019-12528)

Regis Leroy discovered that Squid incorrectly handled certain HTTP
requests. A remote attacker could possibly use this issue to access server
resources prohibited by earlier security filters. (CVE-2020-8449)

Guido Vranken discovered that Squid incorrectly handled certain buffer
operations when acting as a reverse proxy. A remote attacker could use
this issue to cause Squid to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2020-8450)

Aaron Costello discovered that Squid incorrectly handled certain NTLM
authentication credentials. A remote attacker could possibly use this issue
to cause Squid to crash, resulting in a denial of service. (CVE-2020-8517)

Update instructions:

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

Ubuntu 19.10:
  squid                           4.8-1ubuntu2.2

Ubuntu 18.04 LTS:
  squid                           3.5.27-1ubuntu1.5

Ubuntu 16.04 LTS:
  squid                           3.5.12-1ubuntu7.10

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

References:
  https://usn.ubuntu.com/4289-1
  CVE-2019-12528, CVE-2020-8449, CVE-2020-8450, CVE-2020-8517

Package Information:
  https://launchpad.net/ubuntu/+source/squid/4.8-1ubuntu2.2
  https://launchpad.net/ubuntu/+source/squid3/3.5.27-1ubuntu1.5
  https://launchpad.net/ubuntu/+source/squid3/3.5.12-1ubuntu7.10