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CodeSonar® 9.2p0 CONFIDENTIAL CodeSecure Inc
C#


CSHARP.CRYPTO.WIV : Weak Initialization Vector Value (C#)

Summary

A weak, possibly reversible initialization vector is passed as a parameter.

Some cryptography algorithms are nowadays considered as outdated and unsafe or actually broken, since they are too easy to decode. This checker identifies uses of unsafe algorithms for cryptography.

Properties

Class Name Weak Initialization Vector Value (C#)
Significance security
Mnemonic CSHARP.CRYPTO.WIV
Categories
CWE CWE:1204 Generation of Weak Initialization Vector (IV)
OWASP-2017 OWASP-2017:A2 Broken authentication
OWASP-2021 OWASP-2021:A2 Cryptographic failures
  OWASP-2021:A7 Identification and authorization failures
OWASP-2025 OWASP-2025:A04 Cryptographic Failures
Availability Available for C# only.
Enabling Checks for this warning class are enabled by default. To disable them, add the following WARNING_FILTER rule to the project configuration file.
WARNING_FILTER += discard class="Weak Initialization Vector Value (C#)"

Example

using System.Security.Cryptography;

namespace TestNameSpace
{
    class MyClass
    {
        public static ICryptoTransform CreateEncryptor(SymmetricAlgorithm alg, byte[] key) {
            return alg.CreateEncryptor(key, new byte[2] { 0, 2 }); // 'Weak Initialization Vector Value (C#)'
                                                                   // warning issued here
        }
    }
}

Resolution

Generate a secure random Initialization Vector.

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.

 

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