Several security issues were fixed in Squid.
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)
9 June 2016
A security issue affects these releases of Ubuntu and its derivatives:
Several security issues were fixed in Squid.
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)
The problem can be corrected by updating your system to the following package versions:
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.
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