CWE-827 文档类型定义的不恰当控制

Improper Control of Document Type Definition

结构: Simple

Abstraction: Variant

状态: Incomplete

被利用可能性: unkown


The software does not restrict a reference to a Document Type Definition (DTD) to the intended control sphere. This might allow attackers to reference arbitrary DTDs, possibly causing the software to expose files, consume excessive system resources, or execute arbitrary http requests on behalf of the attacker.


As DTDs are processed, they might try to read or include files on the machine performing the parsing. If an attacker is able to control the DTD, then the attacker might be able to specify sensitive resources or requests or provide malicious content.

For example, the SOAP specification prohibits SOAP messages from containing DTDs.


  • cwe_Nature: ChildOf cwe_CWE_ID: 706 cwe_View_ID: 1000 cwe_Ordinal: Primary

  • cwe_Nature: ChildOf cwe_CWE_ID: 829 cwe_View_ID: 1000

  • cwe_Nature: CanPrecede cwe_CWE_ID: 776 cwe_View_ID: 1000


Language: {'cwe_Name': 'XML', 'cwe_Prevalence': 'Undetermined'}

Paradigm: {'cwe_Name': 'Web Based', 'cwe_Prevalence': 'Undetermined'}


范围 影响 注释
Confidentiality Read Files or Directories If the attacker is able to include a crafted DTD and a default entity resolver is enabled, the attacker may be able to access arbitrary files on the system.
Availability ['DoS: Resource Consumption (CPU)', 'DoS: Resource Consumption (Memory)'] The DTD may cause the parser to consume excessive CPU cycles or memory using techniques such as nested or recursive entity references (CWE-776).
['Integrity', 'Confidentiality', 'Availability', 'Access Control'] ['Execute Unauthorized Code or Commands', 'Gain Privileges or Assume Identity'] The DTD may include arbitrary HTTP requests that the server may execute. This could lead to other attacks leveraging the server's trust relationship with other entities.


标识 说明 链接