Several security issues were fixed in Squid.
It was discovered that Squid incorrectly handled certain SNMP packets. A remote attacker could possibly use this issue to cause memory consumption, leading to a denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-19132)
15 July 2019
A security issue affects these releases of Ubuntu and its derivatives:
Several security issues were fixed in Squid.
It was discovered that Squid incorrectly handled certain SNMP packets. A remote attacker could possibly use this issue to cause memory consumption, leading to a denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-19132)
It was discovered that Squid incorrectly handled the cachemgr.cgi web module. A remote attacker could possibly use this issue to conduct cross-site scripting (XSS) attacks. (CVE-2019-13345)
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.