[UNIX] PHP-Ping Arbitrary Command Execution

From: SecuriTeam (support_at_securiteam.com)
Date: 12/29/03

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Date: 29 Dec 2003 18:24:03 +0200

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      PHP-Ping Arbitrary Command Execution
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.theworldsend.net/> PHP-Ping is "a simple ping utility written
    in PHP". A vulnerability in the script allows remote attackers to cause
    the script to execute arbitrary code.

    DETAILS

    Due to improper filtering of the count variable, a remote attacker can
    insert arbitrary commands into the command executed by the PHP script (the
    ping command).

    Example:
    You can use one of the following to verify whether your system is
    vulnerable or not:
    http://www.example.com/php-ping.php?count=1+%26+ls%20-l+%26&submit=Ping%21
    http://www.example.com/php-ping.php?count=1+%26+cat%20/etc/passwd+%26&submit=Ping%21

    Solution:
    Add the following (proper) filtering lines:
          // replace bad chars
          $host= preg_replace ("/[^A-Za-z0-9.]/","",$host);
          $count= preg_replace ("/[^0-9.]/","",$count);

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:security@ppp-design.de>
    ppp-design.

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