Kingdom: Environment
This section includes everything that is outside of the source code but is still critical to the security of the product that is being created. Because the issues covered by this kingdom are not directly related to source code, we separated it from the rest of the kingdoms.
Weak XML Schema: Unbounded Occurrences
Abstract
Setting a
maxOccurs value to unbounded can lead to resources exhaustion and ultimately a denial of service.Explanation
Processing XML documents can be computationally expensive. Attackers may take advantage of schemas that allow unbounded elements by supplying an application with a very large number elements causing the application to exhaust system resources.
The following is an example of a schema that allows unbounded
The following is an example of a schema that allows unbounded
bar elements.
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" >
<xs:element name="foo" >
<xs:complexType>
<xs:sequence>
<xs:element name="bar" maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
References
[1] XML Schema Part 1: Structures Second Edition W3C
[2] Roger L. Costello Constrain the Number of Occurrences of Elements in your XML Schema
[3] Standards Mapping - Common Weakness Enumeration CWE ID 400, CWE ID 770
[4] Standards Mapping - Common Weakness Enumeration Top 25 2019 [20] CWE ID 400
[5] Standards Mapping - Common Weakness Enumeration Top 25 2020 [23] CWE ID 400
[6] Standards Mapping - Common Weakness Enumeration Top 25 2022 [23] CWE ID 400
[7] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001094, CCI-001310, CCI-002385
[8] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[9] Standards Mapping - NIST Special Publication 800-53 Revision 4 SC-5 Denial of Service Protection (P1), SI-10 Information Input Validation (P1)
[10] Standards Mapping - NIST Special Publication 800-53 Revision 5 SC-5 Denial of Service Protection, SI-10 Information Input Validation
[11] Standards Mapping - OWASP API 2023 API8 Security Misconfiguration
[12] Standards Mapping - OWASP Application Security Verification Standard 4.0 8.1.4 General Data Protection (L2 L3), 11.1.3 Business Logic Security Requirements (L1 L2 L3), 11.1.4 Business Logic Security Requirements (L1 L2 L3), 12.1.1 File Upload Requirements (L1 L2 L3), 12.1.3 File Upload Requirements (L2 L3), 13.2.4 RESTful Web Service Verification Requirements (L2 L3)
[13] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[14] Standards Mapping - OWASP Mobile 2024 M8 Security Misconfiguration
[15] Standards Mapping - OWASP Top 10 2004 A9 Application Denial of Service
[16] Standards Mapping - OWASP Top 10 2010 A6 Security Misconfiguration
[17] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration
[18] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration
[19] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.9
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.6
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.6
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.6
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.6
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[26] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[27] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - SANS Top 25 2010 Risky Resource Management - CWE ID 770
[30] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP6080 CAT II
[31] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP6080 CAT II
[32] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP6080 CAT II
[33] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP6080 CAT II
[34] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP6080 CAT II
[35] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP6080 CAT II
[36] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP6080 CAT II
[37] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002390 CAT II, APSC-DV-002400 CAT II, APSC-DV-002550 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002390 CAT II, APSC-DV-002400 CAT II, APSC-DV-002550 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002390 CAT II, APSC-DV-002400 CAT II, APSC-DV-002550 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002390 CAT II, APSC-DV-002400 CAT II, APSC-DV-002550 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002390 CAT II, APSC-DV-002400 CAT II, APSC-DV-002550 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002390 CAT II, APSC-DV-002400 CAT II, APSC-DV-002550 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002390 CAT II, APSC-DV-002400 CAT II, APSC-DV-002550 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002390 CAT II, APSC-DV-002400 CAT II, APSC-DV-002550 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002390 CAT II, APSC-DV-002400 CAT II, APSC-DV-002550 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002390 CAT II, APSC-DV-002400 CAT II, APSC-DV-002550 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002390 CAT II, APSC-DV-002400 CAT II, APSC-DV-002550 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002390 CAT II, APSC-DV-002400 CAT II, APSC-DV-002550 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002390 CAT II, APSC-DV-002400 CAT II, APSC-DV-002550 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002390 CAT II, APSC-DV-002400 CAT II, APSC-DV-002550 CAT I
[51] Standards Mapping - Web Application Security Consortium Version 2.00 Denial of Service (WASC-10)
[52] Standards Mapping - Web Application Security Consortium 24 + 2 Denial of Service
desc.config.xml.weak_xml_schema_unbounded_occurrences