CWE-91 XML注入（XPath盲注）

XML Injection (aka Blind XPath Injection)

结构: Simple

Abstraction: Base

状态: Draft

被利用可能性: unkown

基本描述

The software does not properly neutralize special elements that are used in XML, allowing attackers to modify the syntax, content, or commands of the XML before it is processed by an end system.

扩展描述

Within XML, special elements could include reserved words or characters such as "", """, and "&", which could then be used to add new data or modify XML syntax.

相关缺陷

• cwe_Nature: ChildOf cwe_CWE_ID: 74 cwe_View_ID: 1000 cwe_Ordinal: Primary

• cwe_Nature: ChildOf cwe_CWE_ID: 74 cwe_View_ID: 1003 cwe_Ordinal: Primary

• cwe_Nature: ChildOf cwe_CWE_ID: 74 cwe_View_ID: 699 cwe_Ordinal: Primary

适用平台

Language: {'cwe_Class': 'Language-Independent', 'cwe_Prevalence': 'Undetermined'}

常见的影响

可能的缓解方案

MIT-5 Implementation

策略: Input Validation

Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a whitelist of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
Do not rely exclusively on looking for malicious or malformed inputs (i.e., do not rely on a blacklist). A blacklist is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, blacklists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.

Notes

Maintenance
The description for this entry is generally applicable to XML, but the name includes "blind XPath injection" which is more closely associated with CWE-643. Therefore this entry might need to be deprecated or converted to a general category - although injection into raw XML is not covered by CWE-643 or CWE-652.
Theoretical
In vulnerability theory terms, this is a representation-specific case of a Data/Directive Boundary Error.
Research Gap
Under-reported. This is likely found regularly by third party code auditors, but there are very few publicly reported examples.

分类映射

相关攻击模式

• CAPEC-250
• CAPEC-484
• CAPEC-83

引用

• REF-882 Blind XPath Injection

• REF-62 The Art of Software Security Assessment

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