PHP: Is it safe to add /usr/bin to open_basedir?

No, it isn't safe to add /usr/bin to open_basedir. Once an attacker can execute arbitrary PHP code they will then be able to execute any command in /usr/bin. To limit the attack surface area you could create a bin directory under open_basedir and make a link to convert in it. Make sure it isn't under your web root.

 

 

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