USN-6199-2: PHP vulnerability

USN-6199-1 fixed a vulnerability in PHP. This update provides the
corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.

Original advisory details:

It was discovered that PHP incorrectly handled certain Digest
authentication for SOAP. An attacker could possibly use this issue
to expose sensitive information.

advisory attacker authentication digest expose information issue lts php sensitive sensitive information soap ubuntu update usn vulnerability