界: Security Features

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Access Control: Anonymous LDAP Bind

Abstract

適切な Access Control がない場合、ユーザーの制御下にある値を含む LDAP ステートメントを実行すると、攻撃者は権限のないレコードにアクセスできます。

Explanation

匿名バインドの元で、LDAP クエリを実行すると、事実上 Authentication が行われてなくても、攻撃者は脆弱な設定となっている LDAP 環境を侵害できます。

例 1: 次のコードは、匿名バインドを使用して、DirectoryEntry de を作成します。


...
de = new DirectoryEntry("LDAP://ad.example.com:389/ou=People,dc=example,dc=com");
...

de に対するすべての LDAP クエリは、Authentication および Access Control なしで実行されます。攻撃者は予期しない方法でこれらのクエリのいずれかを操作して、ディレクトリの Access Control メカニズムにより保護されている可能性があるレコードにアクセスする可能性があります。

References

[1] Standards Mapping - Common Weakness Enumeration CWE ID 285

[2] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-000213, CCI-000804, CCI-001084, CCI-002165

[3] Standards Mapping - FIPS200 AC

[4] Standards Mapping - General Data Protection Regulation (GDPR) Access Violation

[5] Standards Mapping - NIST Special Publication 800-53 Revision 4 AC-3 Access Enforcement (P1), IA-2 Identification and Authentication (Organizational Users) (P1), IA-8 Identification and Authentication (Non-Organizational Users) (P1), IA-11 Re-Authentication (P0), SC-3 Security Function Isolation (P1)

[6] Standards Mapping - NIST Special Publication 800-53 Revision 5 AC-3 Access Enforcement, IA-2 Identification and Authentication (Organizational Users), IA-8 Identification and Authentication (Non-Organizational Users), SC-3 Security Function Isolation, SC-11 Trusted Path

[7] Standards Mapping - OWASP Application Security Verification Standard 4.0 4.1.3 General Access Control Design (L1 L2 L3), 4.1.5 General Access Control Design (L1 L2 L3), 4.2.1 Operation Level Access Control (L1 L2 L3), 13.1.4 Generic Web Service Security Verification Requirements (L2 L3)

[8] Standards Mapping - OWASP Mobile 2014 M5 Poor Authorization and Authentication

[9] Standards Mapping - OWASP Mobile 2024 M3 Insecure Authentication/Authorization

[10] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-AUTH-1

[11] Standards Mapping - OWASP Top 10 2004 A2 Broken Access Control

[12] Standards Mapping - OWASP Top 10 2007 A10 Failure to Restrict URL Access

[13] Standards Mapping - OWASP Top 10 2010 A8 Failure to Restrict URL Access

[14] Standards Mapping - OWASP Top 10 2013 A7 Missing Function Level Access Control

[15] Standards Mapping - OWASP Top 10 2017 A5 Broken Access Control

[16] Standards Mapping - OWASP Top 10 2021 A01 Broken Access Control

[17] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.2, Requirement 7.2

[18] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.5.10, Requirement 7.2

[19] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.8, Requirement 7.2

[20] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.8, Requirement 7.2

[21] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.8, Requirement 7.2

[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.8, Requirement 7.2

[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.8, Requirement 7.2

[24] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4, Requirement 7.3.2

[25] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 5.4 - Authentication and Access Control

[26] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 5.4 - Authentication and Access Control

[27] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 5.4 - Authentication and Access Control, Control Objective C.2.3 - Web Software Access Controls

[28] Standards Mapping - SANS Top 25 2009 Porous Defenses - CWE ID 285

[29] Standards Mapping - SANS Top 25 2010 Porous Defenses - CWE ID 285

[30] Standards Mapping - SANS Top 25 2011 Porous Defenses - CWE ID 863

[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3480.1 CAT II

[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3480.1 CAT I

[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3480.1 CAT I

[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3480.1 CAT I

[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3480.1 CAT I

[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3480.1 CAT I

[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3480.1 CAT I

[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-001870 CAT II, APSC-DV-002360 CAT II

[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-001870 CAT II, APSC-DV-002360 CAT II

[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-001870 CAT II, APSC-DV-002360 CAT II

[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-001870 CAT II, APSC-DV-002360 CAT II

[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-001870 CAT II, APSC-DV-002360 CAT II

[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-001870 CAT II, APSC-DV-002360 CAT II

[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-001870 CAT II, APSC-DV-002360 CAT II

[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-001870 CAT II, APSC-DV-002360 CAT II

[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-001870 CAT II, APSC-DV-002360 CAT II

[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-001870 CAT II, APSC-DV-002360 CAT II

[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-001870 CAT II, APSC-DV-002360 CAT II

[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-001870 CAT II, APSC-DV-002360 CAT II

[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-001870 CAT II, APSC-DV-002360 CAT II

[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-001520 CAT II, APSC-DV-001530 CAT II, APSC-DV-001540 CAT I, APSC-DV-001870 CAT II, APSC-DV-002360 CAT II

[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-000460 CAT I, APSC-DV-000470 CAT II, APSC-DV-001520 CAT II, APSC-DV-001530 CAT II, APSC-DV-001540 CAT I, APSC-DV-001870 CAT II, APSC-DV-002360 CAT II

[53] Standards Mapping - Web Application Security Consortium Version 2.00 Insufficient Authorization (WASC-02)

[54] Standards Mapping - Web Application Security Consortium 24 + 2 Insufficient Authorization

desc.dataflow.dotnet.access_control_anonymous_ldap_bind

Abstract

Explanation

匿名バインドの元で、LDAP クエリを実行すると、事実上 Authentication が行われてなくても、攻撃者は脆弱な設定となっている LDAP 環境を侵害できます。

例 1: 次のコードは ldap_simple_bind_s() を使用して、LDAP ディレクトリを匿名でバインドします。


...
rc = ldap_simple_bind_s( ld, NULL, NULL );
  if ( rc != LDAP_SUCCESS ) {
    ...
  }
...

ld に対するすべての LDAP クエリは、Authentication および Access Control なしで実行されます。攻撃者は予期しない方法でこれらのクエリのいずれかを操作して、ディレクトリの Access Control メカニズムにより保護されている可能性があるレコードにアクセスする可能性があります。