Remove all open_basedir restrictions in Plesk

If you want to remove all of the open_basedir restrictions for all sites in Plesk, simply create a file called /etc/httpd/conf.d/zzz_openbasedir_removal.conf and add this text within it:

Plesk 0-Day Exploit

A 0-day vulnerability has been publicly posted which affects older versions of Parallels Plesk software. The author of the exploit included an informational text file which appears indicate public servers have already been exploited. This vulnerability does not affect the latest major version of the software, nevertheless we expect to see widespread exploitation, due to the age of the affected versions — sites still running these versions of Plesk, which should enter End of Life of June 9, are unlikely to be regularly maintained. The vulnerable versions of the Plesk control panel by injecting malicious PHP code, allowing successful attackers to execute arbitrary commands with the privileges of the Apache server userid.