Java


JAVA.CLASS.ACCESS.BYPASS : Reflection Bypasses Member Accessibility (Java)

要旨

Accessibility of a program member is bypassed through reflection.

It is considered to be a bad practice to bypass and not consider the accessibility of a method or a field. So one should never change or ignore accessibility of classes, methods or fields since it could lead to security issues. This checker warns if this is achieved through reflection.

プロパティ

クラス名 Reflection Bypasses Member Accessibility (Java)
日本語クラス名 Reflection Bypasses Member Accessibility (Java)
クラス分類 信頼性 (reliability)
ニーモニック JAVA.CLASS.ACCESS.BYPASS
カテゴリー
CWE CWE:915 Improperly Controlled Modification of Dynamically-Determined Object Attributes
CERT-Java CERT-Java:SEC05-J Do not use reflection to increase accessibility of classes, methods, or fields
対応言語 Java で利用可能です。
有効/無効設定 このワーニングクラスのチェックはデフォルトで有効になっています。チェックを無効にするにはプロジェクト設定ファイル (configuration file)に以下の WARNING_FILTER ルールを追加してください。
WARNING_FILTER += discard class="Reflection Bypasses Member Accessibility (Java)"

public class ReflectionCode
{
  public void reflectionExample(int newValue) throws NoSuchMethodException{
      PrivateMembers pm = new PrivateMembers();
      Class<PrivateMembers> class1 = PrivateMembers.class;

      class1.getMethod("privateMethod").setAccessible(true);  /* Reflection Modifies Member Accessibility (Java) warning issued here: 
                                                               * setAccessible(true) will disable accessibility checks from the JVM on the
                                                               * target program member, allowing it to be accessed even when its visibility
                                                               * would prevent it.
                                                               */ 

      class1.getDeclaredField("myInt").setInt(pm, newValue);  /* Reflection Bypasses Member Accessibility (Java) warning issued here: 
                                                               * invoking getDeclaredXXX methods of java.lang.Class will also 
                                                               * retrieve non-visible members
                                                               */ 
  } 
}

public class PrivateMembers {
  private int myInt;

  private void privateMethod() {
      System.out.println(myInt);
  }
}

解決法

Don't change or bypass the accessibility level of program members. Only use reflective method calls that take into account the visibility of the target member.

関連のある設定ファイルパラメータ

設定ファイルの以下のパラメータがこのワーニングクラスのチェックに影響します。