B-swiss 3 Digital Signage System version 3.6.5 suffers from an authenticated arbitrary PHP code execution vulnerability. The vulnerability is caused due to the improper verification of uploaded files in index.php script thru the rec_poza POST parameter. This can be exploited to execute arbitrary PHP code by uploading a malicious PHP script file that will be stored in the /usr/users directory. Due to an undocumented and hidden maintenance account admin_m which has the highest privileges in the application, an attacker can use these hard-coded credentials to authenticate and use the vulnerable image upload functionality to execute code on the server.
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