LDAP Manipulation

ABSTRACT

執行一個 LDAP 指令，該指令包含了由用戶控制的數值字符串，且使用濾字符串以外的字符，這可能會使攻擊者改變指令的含義或執行非法 LDAP 命令。

EXPLANATION

LDAP manipulation 錯誤在以下情況中出現：

1. 數據從一個不可信賴的數據源進入程序。

2. 數據在一個動態 LDAP 指令的濾字符串之外使用。

例 1：以下代碼從一個 HTTP 請求里讀取用戶名和密碼，并且使用它去執行 LDAP 查詢。


env.put(Context.SECURITY_AUTHENTICATION, "none");
DirContext ctx = new InitialDirContext(env);

String empID = request.getParameter("empID");

try
{
BasicAttribute attr = new BasicAttribute("empID", empID);

NamingEnumeration employee = 
ctx.search("ou=People,dc=example,dc=com",attr);  
...

因為該查詢包含用戶輸入，且會在匿名綁定下執行，因此，該查詢會返回所有指定用戶名的詳細信息，而不會考慮其密碼是否與指定密碼相匹配。攻擊者可以有效使用以下代碼查詢系統中任意雇員的詳細信息，這是一個嚴重的 privacy violation。問題在于開發人員沒能充分利用適當的 access control 機制來限制查詢，使查詢只能讀取那些允許當前用戶讀取的雇員記錄。

REFERENCES

[1] Standards Mapping - OWASP Top 10 2004 - (OWASP 2004) A1 Unvalidated Input

[2] Standards Mapping - OWASP Top 10 2004 - (OWASP 2004) A2 Broken Access Control

[3] Standards Mapping - OWASP Top 10 2007 - (OWASP 2007) A4 Insecure Direct Object Reference

[4] Standards Mapping - OWASP Top 10 2010 - (OWASP 2010) A4 Insecure Direct Object References

[5] Standards Mapping - FIPS200 - (FISMA) AC

[6] Standards Mapping - Security Technical Implementation Guide Version 3 - (STIG 3) APP3510 CAT I

[7] Standards Mapping - Security Technical Implementation Guide Version 3.4 - (STIG 3.4) APP3510 CAT I

[8] Standards Mapping - Common Weakness Enumeration - (CWE) CWE ID 639

[9] Standards Mapping - Common Weakness Enumeration - (CWE) CWE ID 90

[10] Standards Mapping - SANS Top 25 2009 - (SANS 2009) Insecure Interaction - CWE ID 116

[11] Standards Mapping - Web Application Security Consortium 24 + 2 - (WASC 24 + 2) Insufficient Authorization

[12] Standards Mapping - SANS Top 25 2011 - (SANS Top 25 2011) Porous Defenses - CWE ID 863

[13] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 - (PCI 1.2) Requirement 6.3.1.1

[14] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 - (PCI 1.1) Requirement 6.5.1

[15] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 - (PCI 1.1) Requirement 6.5.2

[16] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 - (PCI 1.2) Requirement 6.5.4

[17] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 - (PCI 2.0) Requirement 6.5.8

[18] Standards Mapping - FIPS200 - (FISMA) SI

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