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CodeSonar® 9.2p0 CONFIDENTIAL CodeSecure Inc
C and C++
Binaries

BADFUNC.RANDOM.RAND48 : rand48の使用

要旨

rand48 ファミリーの関数を使用しています。 これらの関数はセキュアなアプリケーション向けに十分なランダム性を提供していません。

プロパティ

クラス名 Use of rand48 Function
日本語クラス名 rand48の使用
クラス分類 セキュリティ (security)
ニーモニック BADFUNC.RANDOM.RAND48
カテゴリー
CWE CWE:327 Use of a Broken or Risky Cryptographic Algorithm
  CWE:332 Insufficient Entropy in PRNG
  CWE:334 Small Space of Random Values
  CWE:338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
  CWE:676 Use of Potentially Dangerous Function
DISA-6r1 DISA-6r1:V-222397 The application must implement cryptographic mechanisms to protect the integrity of remote access sessions.
  DISA-6r1:V-222570 The application must utilize FIPS-validated cryptographic modules when signing application components.
  DISA-6r1:V-222571 The application must utilize FIPS-validated cryptographic modules when generating cryptographic hashes.
  DISA-6r1:V-222572 The application must utilize FIPS-validated cryptographic modules when protecting unclassified information that requires cryptographic protection.
  DISA-6r1:V-222583 The application must use the Federal Information Processing Standard (FIPS) 140-2-validated cryptographic modules and random number generator if the application implements encryption, key exchange, digital signature, and hash functionality.
DISA-5r3 DISA-5r3:V-69259 The application must implement cryptographic mechanisms to protect the integrity of remote access sessions.
  DISA-5r3:V-70191 The application must utilize FIPS-validated cryptographic modules when signing application components.
  DISA-5r3:V-70193 The application must utilize FIPS-validated cryptographic modules when generating cryptographic hashes.
  DISA-5r3:V-70195 The application must utilize FIPS-validated cryptographic modules when protecting unclassified information that requires cryptographic protection.
  DISA-5r3:V-70217 The application must use the Federal Information Processing Standard (FIPS) 140-2-validated cryptographic modules and random number generator if the application implements encryption, key exchange, digital signature, and hash functionality.
DISA-4r3 DISA-4r3:V-69259 The application must implement cryptographic mechanisms to protect the integrity of remote access sessions.
  DISA-4r3:V-70191 The application must utilize FIPS-validated cryptographic modules when signing application components.
  DISA-4r3:V-70193 The application must utilize FIPS-validated cryptographic modules when generating cryptographic hashes.
  DISA-4r3:V-70195 The application must utilize FIPS-validated cryptographic modules when protecting unclassified information that requires cryptographic protection.
  DISA-4r3:V-70217 The application must use the Federal Information Processing Standard (FIPS) 140-2-validated cryptographic modules and random number generator if the application implements encryption, key exchange, digital signature, and hash functionality.
DISA-3r10 DISA-3r10:V-6137 The designer will ensure the application uses the Federal Information Processing Standard (FIPS) 140-2 validated cryptographic modules and random number generator if the application implements encryption, key exchange, digital signature, and hash functionality.
BSI BSI:MetaRule  
OWASP-2017 OWASP-2017:A9 Using components with known vulnerabilities
OWASP-2021 OWASP-2021:A2 Cryptographic failures
  OWASP-2021:A4 Insecure design
  OWASP-2021:A6 Vulnerable and outdated components
OWASP-2025 OWASP-2025:A03 Software Supply Chain Failures
  OWASP-2025:A04 Cryptographic Failures
  OWASP-2025:A06 Insecure Design
対応言語 C および C++ 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無効になっています。チェックを有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 += allow class="Use of rand48 Function"
全ての BSI 固有の BADFUNC クラスを含む BSI 関連クラスを有効にするには、 bsi 設定プリセットを使用してください。

ワーニングを引き起こす関数

解決法

暗号的に安全な乱数生成器を使用し、適切な乱数によってシード値が与えられていることを確認してください。

関連のある設定ファイルパラメータ

このクラスは一般テンプレート設定ファイルで BAD_FUNCTION_* ルールセットによって実装されています。

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。

 

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