How to Block Script Uploads in Node.JS

Apart from all the usual infected file uploads, script attacks are a particularly difficult attack to block, slipping right past most forms of security that don’t specifically screen for malicious scripts. To fully protect yourself, you are going to need something ironclad, and I have just the thing. Today, I will be demonstrating how to set up Cloudmersive’s advanced virus scanning API, which can not only block scripts, but also detect masked executable files.

To start off, we need to install the client library for the API:

npm install cloudmersive-virus-api-client --save

Now we can call the advanced virus scanning function:

var CloudmersiveVirusApiClient = require('cloudmersive-virus-api-client');var defaultClient = CloudmersiveVirusApiClient.ApiClient.instance;// Configure API key authorization: Apikeyvar Apikey = defaultClient.authentications['Apikey'];Apikey.apiKey = 'YOUR API KEY';// Uncomment the following line to set a prefix for the API key, e.g. "Token" (defaults to null)//Apikey.apiKeyPrefix = 'Token';var apiInstance = new CloudmersiveVirusApiClient.ScanApi();var inputFile = "/path/to/file"; // File | Input file to perform the operation on.var opts = {'allowExecutables': true, // Boolean | Set to false to block executable files (program code) from being allowed in the input file.  Default is false (recommended).'allowInvalidFiles': true, // Boolean | Set to false to block invalid files, such as a PDF file that is not really a valid PDF file, or a Word Document that is not a valid Word Document.  Default is false (recommended).'allowScripts': true, // Boolean | Set to false to block script files, such as a PHP files, Pythong scripts, and other malicious content or security threats that can be embedded in the file.  Set to true to allow these file types.  Default is false (recommended).'allowPasswordProtectedFiles': true, // Boolean | Set to false to block password protected and encrypted files, such as encrypted zip and rar files, and other files that seek to circumvent scanning through passwords.  Set to true to allow these file types.  Default is false (recommended).'restrictFileTypes': "restrictFileTypes_example" // String | Specify a restricted set of file formats to allow as clean as a comma-separated list of file formats, such as .pdf,.docx,.png would allow only PDF, PNG and Word document files.  All files must pass content verification against this list of file formats, if they do not, then the result will be returned as CleanResult=false.  Set restrictFileTypes parameter to null or empty string to disable; default is disabled.};var callback = function(error, data, response) {if (error) {console.error(error);} else {console.log('API called successfully. Returned data: ' + data);}};apiInstance.scanFileAdvanced(inputFile, opts, callback);

Besides performing triple layered malware scanning, this API also detects scripts, executables, invalid files, and password protected files.

There’s an API for that. Cloudmersive is a leader in Highly Scalable Cloud APIs.

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