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Ubuntu Security Notice USN-4723-1
February 08, 2021

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

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

PEAR could be made to overwrite files as the administrator.

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

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 20.10:
  php-pear                        1:1.10.9+submodules+notgz-1ubuntu0.20.10.2

Ubuntu 20.04 LTS:
  php-pear                        1:1.10.9+submodules+notgz-1ubuntu0.20.04.2

Ubuntu 18.04 LTS:
  php-pear                        1:1.10.5+submodules+notgz-1ubuntu1.18.04.3

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

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

References:
  https://usn.ubuntu.com/4723-1
  CVE-2020-36193

Package Information:

https://launchpad.net/ubuntu/+source/php-pear/1:1.10.9+submodules+notgz-1ubuntu0.20.10.2

https://launchpad.net/ubuntu/+source/php-pear/1:1.10.9+submodules+notgz-1ubuntu0.20.04.2

https://launchpad.net/ubuntu/+source/php-pear/1:1.10.5+submodules+notgz-1ubuntu1.18.04.3
  https://launchpad.net/ubuntu/+source/php-pear/1:1.10.1+submodules+notgz-6ubuntu0.3