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            Password Management: Weak Cryptography

            ABSTRACT

            采用一些簡單的編碼方式給密碼加密并不能有效地保護密碼。

            EXPLANATION

            當密碼以明文形式存儲在應用程序的屬性文件或其他配置文件中時,會發生 password management 漏洞。程序員試圖通過編碼函數來遮蔽密碼,以修補 password management 漏洞,例如使用 64 位基址編碼方式,但都不能起到充分保護密碼的作用。


            示例:以下代碼可以從屬性文件中讀取密碼,并使用該密碼連接到數據庫。


            ...
            ...
            Private Declare Function GetPrivateProfileString _
            Lib "kernel32" Alias "GetPrivateProfileStringA" _
            (ByVal lpApplicationName As String, _
            ByVal lpKeyName As Any, ByVal lpDefault As String, _
            ByVal lpReturnedString As String, ByVal nSize As Long, _
            ByVal lpFileName As String) As Long
            ...
            Dim password As String
            ...
            password = StrConv(DecodeBase64(GetPrivateProfileString("MyApp", "Password", _
            "", value, Len(value), _
            App.Path & "\" & "Config.ini")), vbUnicode)
            ...
            con.ConnectionString = "Driver={Microsoft ODBC for Oracle};Server=OracleServer.world;Uid=scott;Pwd=" & password &";"
            ...



            這組代碼可以順利運行,但是任何對 Config.ini 具有訪問權限的人都能讀取 Password 中的值,并且很容易確定這個值是否經過 64 位基址編碼。而這給了心懷不軌的雇員利用這一信息破壞系統的機會。

            REFERENCES

            [1] Standards Mapping - OWASP Top 10 2010 - (OWASP 2010) A7 Insecure Cryptographic Storage

            [2] Standards Mapping - OWASP Top 10 2007 - (OWASP 2007) A8 Insecure Cryptographic Storage

            [3] Standards Mapping - OWASP Top 10 2004 - (OWASP 2004) A8 Insecure Storage

            [4] Standards Mapping - Security Technical Implementation Guide Version 3 - (STIG 3) APP3150.1 CAT II

            [5] Standards Mapping - Security Technical Implementation Guide Version 3.4 - (STIG 3.4) APP3150.1 CAT II

            [6] Standards Mapping - Security Technical Implementation Guide Version 3 - (STIG 3) APP3210.1 CAT II, APP3340 CAT I

            [7] Standards Mapping - Security Technical Implementation Guide Version 3.4 - (STIG 3.4) APP3210.1 CAT II, APP3340 CAT I

            [8] Standards Mapping - Common Weakness Enumeration - (CWE) CWE ID 256

            [9] Standards Mapping - Common Weakness Enumeration - (CWE) CWE ID 261

            [10] Standards Mapping - FIPS200 - (FISMA) IA

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

            [12] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 - (PCI 1.2) Requirement 3.4, Requirement 6.3.1.3, Requirement 6.5.8, Requirement 8.4

            [13] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 - (PCI 2.0) Requirement 3.4, Requirement 6.5.3, Requirement 8.4

            [14] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 - (PCI 1.1) Requirement 3.4, Requirement 6.5.8, Requirement 8.4


            Copyright 2013 Fortify Software - All rights reserved.
            (Generated from version 2013.1.1.0008 of the Fortify Secure Coding Rulepacks)
            desc.dataflow.vb.password_management_weak_cryptography

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