界: Input Validation and Representation
输入验证与表示问题是由元字符、交替编码和数字表示引起的。安全问题源于信任输入。这些问题包括：“Buffer Overflows”、“Cross-Site Scripting”攻击、“SQL Injection”等其他问题。
Denial of Service: Format String
Abstract
如果允许用户输入控制格式参数，则攻击者能够借此造成异常抛出或信息泄露。
Explanation
攻击者可以修改格式字符串参数，以造成异常抛出。如果未能捕获此异常，则可能导致应用程序崩溃。或者，如果其他参数中使用了敏感信息，攻击者可能会更改格式字符串以泄露此信息。
示例 1：用户可通过以下代码指定
此程序的最初设计旨在让用户指定所显示余额的小数点。但在现实情况中，对此并没有限制。如果用户可以指定所有内容，则可能会导致抛出如
针对此示例，更严重的情况是：如果攻击者可以指定用户输入 "2f %3$s %4$.2"，则格式字符串可能会是 "The customer: %s %s has the balance %4$.2f %3$s %4$.2"。这可能会导致敏感的
示例 1：用户可通过以下代码指定
Formatter.format() 的格式字符串参数。
...
Formatter formatter = new Formatter(Locale.US);
String format = "The customer: %s %s has the balance %4$." + userInput + "f";
formatter.format(format, firstName, lastName, accountNo, balance);
...
此程序的最初设计旨在让用户指定所显示余额的小数点。但在现实情况中，对此并没有限制。如果用户可以指定所有内容，则可能会导致抛出如
java.util.MissingFormatArgumentException 等异常。此外，由于它不在 try 块中，因此可能会造成应用程序故障。 针对此示例，更严重的情况是：如果攻击者可以指定用户输入 "2f %3$s %4$.2"，则格式字符串可能会是 "The customer: %s %s has the balance %4$.2f %3$s %4$.2"。这可能会导致敏感的
accountNo 包含在生成的字符串中。References
[1] IDS06-J. Exclude unsanitized user input from format strings CERT
[2] Standards Mapping - Common Weakness Enumeration CWE ID 730
[3] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001094, CCI-001310
[4] Standards Mapping - NIST Special Publication 800-53 Revision 4 SC-5 Denial of Service Protection (P1), SI-10 Information Input Validation (P1)
[5] Standards Mapping - NIST Special Publication 800-53 Revision 5 SC-5 Denial of Service Protection, SI-10 Information Input Validation
[6] Standards Mapping - OWASP API 2023 API8 Security Misconfiguration
[7] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[8] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[9] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4
[10] Standards Mapping - OWASP Top 10 2004 A9 Application Denial of Service
[11] Standards Mapping - OWASP Top 10 2013 A1 Injection
[12] Standards Mapping - OWASP Top 10 2017 A1 Injection
[13] Standards Mapping - OWASP Top 10 2021 A03 Injection
[14] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.9
[15] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.6
[16] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.6
[17] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.6
[18] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.6
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[21] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[22] 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
[23] 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
[24] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP6080 CAT II
[25] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP6080 CAT II
[26] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP6080 CAT II
[27] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP6080 CAT II
[28] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP6080 CAT II
[29] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP6080 CAT II
[30] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP6080 CAT II
[31] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002400 CAT II
[32] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002400 CAT II
[33] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002400 CAT II
[34] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002400 CAT II
[35] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002400 CAT II
[36] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002400 CAT II
[37] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002400 CAT II
[38] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002400 CAT II
[39] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002400 CAT II
[40] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002400 CAT II
[41] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002400 CAT II
[42] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002400 CAT II
[43] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002400 CAT II
[44] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002400 CAT II, APSC-DV-002530 CAT II
[45] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002400 CAT II, APSC-DV-002530 CAT II
[46] Standards Mapping - Web Application Security Consortium Version 2.00 Denial of Service (WASC-10)
[47] Standards Mapping - Web Application Security Consortium 24 + 2 Denial of Service
desc.dataflow.java.denial_of_service_format_string