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php recommend disable_functions

Discussion in 'Security' started by Venomous21, Sep 16, 2014.

  1. Venomous21

    Venomous21 Well-Known Member

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    Hello,

    Got a question about hardening php and figure I will ask it here since so many of us use it on our servers.

    PHP.INI settings: Disable exec, shell_exec, system, popen and Other Functions To Improve Security

    That article recommends setting these directives in php.ini:

    disable_functions =exec,passthru,shell_exec,system,proc_open,popen,curl_exec,curl_multi_exec,parse_ini_file,show_source

    Is it likely that disabling these functions will have any affect on standard drupal or wordpress installs? Do you recommend disabling any others? Or any other general hardening tips?

    I use modsuphp, disabled shell access, latest version of php 5.3 & 5.4 (migrating all to 5.4), keep apache up-to-date, etc.

    Thank you.
     
    #1 Venomous21, Sep 16, 2014
  2. quizknows

    quizknows Well-Known Member

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    I have used this for disable_functions for a long time and never had any problems with wordpress or other common CMS software:

    disable_functions = show_source,system,shell_exec,passthru,exec,phpinfo,popen,proc_open,allow_url_fopen

    The other ones you listed are probably OK to disable too.

    Other than that make sure you have some form of cross-account symlink protection, even if it's just the patch in EA.
     
    #2 quizknows, Sep 16, 2014
  3. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello :)

    The "Security Advisor" option in WHM is a good place to start for tips on how to improve security on your server.

    Thank you.
     
    #3 cPanelMichael, Sep 17, 2014
  4. Venomous21

    Venomous21 Well-Known Member

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    quizknows, thank you. Is the allow_url_fopen needed in disable_functions if I have it set globally to Off already in php.ini? I am also already using the EA symlink patch and security advisor :) Thanks for the info!
     
    #4 Venomous21, Sep 17, 2014
  5. quizknows

    quizknows Well-Known Member

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    It's probably not needed, but it also won't hurt anything.
     
    #5 quizknows, Sep 17, 2014
  6. storminternet

    storminternet Well-Known Member

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    If you have disabled allow_url_fopen in php.ini then there is no need to add it in list of disable functions list.
     
    #6 storminternet, Sep 18, 2014
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