Ubuntu Security Update USN-6841-2: PHP vulnerability

[LinuxBot]

USN-6841-1 fixed a vulnerability in PHP. This update provides the corresponding updates for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Original advisory details: It was discovered that PHP could early return in the filter_var function resulting in invalid user information being treated as valid user information. An attacker could possibly use this issue to expose raw user input information.

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