USN-2995-1: Squid vulnerabilities

Ubuntu Security Notice USN-2995-1

9th June, 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 version:

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

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

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