USN-6500-2: Squid vulnerabilities

USN-6500-1 fixed several vulnerabilities in Squid. This update provides
the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.

Original advisory details:

Joshua Rogers discovered that Squid incorrectly handled the Gopher
protocol. A remote attacker could possibly use this issue to cause Squid to
crash, resulting in a denial of service. Gopher support has been disabled
in this update. (CVE-2023-46728)

Joshua Rogers discovered that Squid incorrectly handled HTTP Digest
Authentication. A remote attacker could possibly use this issue to …

advisory attacker crash denial of service disabled issue lts protocol rogers service squid support ubuntu update usn vulnerabilities