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C#

C# static code analysis

Unique rules to find Bugs, Vulnerabilities, Security Hotspots, and Code Smells in your C# code

  • All rules 493
  • Vulnerability46
  • Bug88
  • Security Hotspot24
  • Code Smell335

  • Quick Fix 61
 
Tags
    Impact
      Clean code attribute
        1. Using unsafe code blocks is security-sensitive

           Security Hotspot
        2. Not specifying a timeout for regular expressions is security-sensitive

           Security Hotspot
        3. Hard-coded secrets are security-sensitive

           Security Hotspot
        4. Constructing arguments of system commands from user input is security-sensitive

           Security Hotspot
        5. Deserializing objects without performing data validation is security-sensitive

           Security Hotspot
        6. Disabling ASP.NET "Request Validation" feature is security-sensitive

           Security Hotspot
        7. Allowing requests with excessive content length is security-sensitive

           Security Hotspot
        8. Using publicly writable directories is security-sensitive

           Security Hotspot
        9. Using clear-text protocols is security-sensitive

           Security Hotspot
        10. Having a permissive Cross-Origin Resource Sharing policy is security-sensitive

           Security Hotspot
        11. Expanding archive files without controlling resource consumption is security-sensitive

           Security Hotspot
        12. Configuring loggers is security-sensitive

           Security Hotspot
        13. Using weak hashing algorithms is security-sensitive

           Security Hotspot
        14. Delivering code in production with debug features activated is security-sensitive

           Security Hotspot
        15. Disabling CSRF protections is security-sensitive

           Security Hotspot
        16. Searching OS commands in PATH is security-sensitive

           Security Hotspot
        17. Creating cookies without the "HttpOnly" flag is security-sensitive

           Security Hotspot
        18. Setting loose file permissions is security-sensitive

           Security Hotspot
        19. Using non-standard cryptographic algorithms is security-sensitive

           Security Hotspot
        20. Using pseudorandom number generators (PRNGs) is security-sensitive

           Security Hotspot
        21. Creating cookies without the "secure" flag is security-sensitive

           Security Hotspot
        22. Formatting SQL queries is security-sensitive

           Security Hotspot
        23. Hard-coded credentials are security-sensitive

           Security Hotspot
        24. Using hardcoded IP addresses is security-sensitive

           Security Hotspot

        Creating cookies without the "secure" flag is security-sensitive

        intentionality - complete
        security
        Security Hotspot
        • cwe
        • privacy

        When a cookie is protected with the secure attribute set to true it will not be send by the browser over an unencrypted HTTP request and thus cannot be observed by an unauthorized person during a man-in-the-middle attack.

        Ask Yourself Whether

        • the cookie is for instance a session-cookie not designed to be sent over non-HTTPS communication.
        • it’s not sure that the website contains mixed content or not (ie HTTPS everywhere or not)

        There is a risk if you answered yes to any of those questions.

        Recommended Secure Coding Practices

        • It is recommended to use HTTPs everywhere so setting the secure flag to true should be the default behaviour when creating cookies.
        • Set the secure flag to true for session-cookies.

        Sensitive Code Example

        When the HttpCookie.Secure property is set to false then the cookie will be send during an unencrypted HTTP request:

        HttpCookie myCookie = new HttpCookie("Sensitive cookie");
        myCookie.Secure = false; //  Sensitive: a security-sensitive cookie is created with the secure flag set to false
        

        The default value of Secure flag is false, unless overwritten by an application’s configuration file:

        HttpCookie myCookie = new HttpCookie("Sensitive cookie");
        //  Sensitive: a security-sensitive cookie is created with the secure flag not defined (by default set to false)
        

        Compliant Solution

        Set the HttpCookie.Secure property to true:

        HttpCookie myCookie = new HttpCookie("Sensitive cookie");
        myCookie.Secure = true; // Compliant
        

        Or change the default flag values for the whole application by editing the Web.config configuration file:

        <httpCookies httpOnlyCookies="true" requireSSL="true" />
        
        • the requireSSL attribute corresponds programmatically to the Secure field.
        • the httpOnlyCookies attribute corresponds programmatically to the httpOnly field.

        See

        • OWASP - Top 10 2021 Category A4 - Insecure Design
        • OWASP - Top 10 2021 Category A5 - Security Misconfiguration
        • OWASP - Top 10 2017 Category A3 - Sensitive Data Exposure
        • CWE - CWE-311 - Missing Encryption of Sensitive Data
        • CWE - CWE-315 - Cleartext Storage of Sensitive Information in a Cookie
        • CWE - CWE-614 - Sensitive Cookie in HTTPS Session Without 'Secure' Attribute
        • STIG Viewer - Application Security and Development: V-222576 - The application must set the secure flag on session cookies.
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          on-premise CI
          Available Since
          9.1
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          Developer Edition
          Available Since
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