USN-5300-2: PHP vulnerabilities

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USN-5300-1 fixed vulnerabilities in PHP. This update provides the
corresponding updates for Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.

Original advisory details:

It was discovered that PHP incorrectly handled certain scripts.
An attacker could possibly use this issue to cause a denial of service.
(CVE-2015-9253, CVE-2017-8923, CVE-2017-9118, CVE-2017-9120)

It was discovered that PHP incorrectly handled certain inputs.
An attacker could possibly use this issue to cause a denial of service,
or possibly obtain sensitive information. (CVE-2017-9119)

It was discovered that PHP incorrectly handled certain scripts with XML
parsing functions.
An attacker could possibly use this issue to obtain sensitive information.
(CVE-2021-21707)

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