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Ubuntu Security Notice USN-5027-2
August 04, 2021

php-pear vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 ESM

Summary:

PEAR could be made to overwrite files as the administrator.

Software Description:
- php-pear: PHP Extension and Application Repository

Details:

USN-5027-1 fixed a vulnerability in PEAR. This update provides
the corresponding update for Ubuntu 16.04 ESM.

Original advisory details:

 It was discovered that PEAR incorrectly handled symbolic links in archives.
 A remote attacker could possibly use this issue to execute arbitrary code.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 ESM:
  php-pear                        1:1.10.1+submodules+notgz-6ubuntu0.3+esm1

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5027-2
  https://ubuntu.com/security/notices/USN-5027-1
  CVE-2021-32610