Refactor this code to not place tainted, user-controlled data in the header

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Refactor this code to not place tainted, user-controlled data in the header

  1. Refactor this code to not place tainted, user-controlled data in the header

    The problem is because you are using a header name (“SampleHeader”) to make a logical decision in your code.

  2. Refactor this code to not place tainted, user-controlled data in the header

    The problem is because you are using a header name (“SampleHeader”) to make a logical decision in your code.

Solution 1

The problem is because you are using a header name (“SampleHeader”) to make a logical decision in your code.

User provided data, such as URL parameters, POST data payloads or cookies, should always be considered untrusted and tainted. Applications logging tainted data could enable an attacker to inject characters that would break the log file pattern. This could be used to block monitors and SIEM (Security Information and Event Management) systems from detecting other malicious events.

In this case if I wanted to fool your program into adding a new header into the headers list I would simply need to send a curl like this:

curl -X GET http://localhost/your/path --header 'SampleHeader: someValue'  

This problem could be mitigated by sanitizing the user provided data before logging it.

What SonarQube is trying to tell you is that you are exposing your logic to input from the clients. A better solution would be to refactor your code to not depend on a specific header from the client to perform some action. Its hard to suggest sample code without seeing a little more of the codebase.

Hope this helps!

Original Author Of This Content

Solution 2

You can use OWASP Encoder to encode user input:

<dependency>
    <groupId>org.owasp.encoder</groupId>
    <artifactId>encoder</artifactId>
    <version>1.2.3</version>
</dependency>

Add Encode.forJava(userInput) for user input which will:

Encodes for a Java string. This method will use “\b”, “\t”, “\r”,
“\f”, “\n”, “””, “‘”, “\”, octal and unicode escapes. Valid
surrogate pairing is not checked. The caller must provide the
enclosing quotation characters. This method is useful for when writing
code generators and outputting debug messages.

So in your case it may be:

Enumeration<String> headerNames = request.getHeaderNames();
while (headerNames.hasMoreElements()) {
    String headerName = Encode.forJava(headerNames.nextElement());
    if (headerName.equalsIgnoreCase("SampleHeader"){
        headers.add(headerName, request.getHeader(headerName));
    }
}

Original Author Of This Content

Conclusion

So This is all About This Tutorial. Hope This Tutorial Helped You. Thank You.

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Siddharth

I am an Information Technology Engineer. I have Completed my MCA And I have 4 Year Plus Experience, I am a web developer with knowledge of multiple back-end platforms Like PHP, Node.js, Python and frontend JavaScript frameworks Like Angular, React, and Vue.

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