界: Input Validation and Representation

輸入驗證和表示法問題是由中繼字元、替代編碼和數值表示法引起的。信任輸入會導致安全問題。問題包括：「Buffer Overflows」、「Cross-Site Scripting」攻擊、「SQL Injection」及其他許多問題。

Possible Variable Overwrite

Abstract
這將會覆寫變數，但也等於是為攻擊者製造機會。
Explanation
函數若可覆寫已初始化的變數，則會讓攻擊者得以影響依賴已覆寫變數的程式碼執行。
可以覆寫變數。

範例 1：若攻擊者在以下 ColdFusion 程式碼區段中為 varName 提供惡意值，則呼叫 SetVariable() 時可能會覆寫包括 #first# 在內的任意變數。在此案例中，若包含 JavaScript 的惡意值覆寫 #first#，此程式會容易受到 Cross-Site Scripting 攻擊。 


<cfset first = "User">
<cfscript>
SetVariable(url.varName, url.varValue);
</cfscript>
<cfoutput>
#first#
</cfoutput>
References
[1] Standards Mapping - Common Weakness Enumeration CWE ID 473
[2] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001310
[3] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[4] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[5] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[6] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4
[7] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.6
[8] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.6
[9] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.6
[10] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.6
[11] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[12] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[13] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[14] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[15] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[16] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II
[17] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II
desc.dataflow.cfml.possible_variable_overwrite