BADFUNC.WEAKCRYPTO : 脆弱な暗号関数の使用

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以下の関数のいずれかが使用されており、暗号として脆弱であるため、セキュアなアプリケーションでは信頼されません。

DESファミリ (チェックでは、関数名の接頭辞である DES_ を大文字・小文字で区別しません)。

DES_ecb_encrypt(), DES_ecb2_encrypt()

DES_xcbc_encrypt(), DES_ncbc_encrypt(), DES_pcbc_encrypt()

DES_cfb_encrypt(), DES_ofb_encrypt(), DES_cfb64_encrypt(), DES_ofb64_encrypt()

DES_ede2_cbc_encrypt(), DES_ede2_cfb64_encrypt(), DES_ede2_ofb64_encrypt()

DES_crypt(), DES_fcrypt()

MD5ファミリ

MD2_Init(), MD4_Init(), MD5_Init()

MD2_Update(), MD4_Update(), MD5_Update()

MD2_Final(), MD4_Final(), MD5_Final()

Use of crypt も参照してください。

クラス名

Weak Cryptography

日本語クラス名

脆弱な暗号関数の使用

クラス分類

セキュリティ (security)

ニーモニック

BADFUNC.WEAKCRYPTO

カテゴリー

CWE	CWE:326	Inadequate Encryption Strength
	CWE:327	Use of a Broken or Risky Cryptographic Algorithm
	CWE:330	Use of Insufficiently Random Values
	CWE:338	Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
	CWE:676	Use of Potentially Dangerous Function
CERT-C	CERT-C:MSC25-C	Do not use insecure or weak cryptographic algorithms
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-6r1:V-222589	The application must use appropriate cryptography in order to protect stored DoD information when required by the information owner or DoD policy.
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-5r3:V-70229	The application must use appropriate cryptography in order to protect stored DoD information when required by the information owner or DoD policy.
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-4r3:V-70229	The application must use appropriate cryptography in order to protect stored DoD information when required by the information owner or DoD policy.
OWASP-2017	OWASP-2017:A2	Broken authentication
	OWASP-2017:A3	Sensitive data exposure
	OWASP-2017:A5	Broken access control
	OWASP-2017:A9	Using components with known vulnerabilities
OWASP-2021	OWASP-2021:A1	Broken access control
	OWASP-2021:A2	Cryptographic failures
	OWASP-2021:A6	Vulnerable and outdated components
	OWASP-2021:A7	Identification and authorization failures

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="Weak Cryptography"

#include <openssl/md2.h>

void weakcrypto(MD2_CTX *ctx){
  if (MD2_Init(ctx)){  /* 'Weak Cryptography' warning issued here */
    /* ... */
  }
  /* ... */
}

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。

BADFUNC.WEAKCRYPTO : 脆弱な暗号関数の使用

要旨

プロパティ

例

関連のある設定ファイルパラメータ