CWE-650 在服务器端信任HTTP权限模型

Trusting HTTP Permission Methods on the Server Side

结构: Simple

Abstraction: Variant

状态: Incomplete

被利用可能性: High

基本描述

The server contains a protection mechanism that assumes that any URI that is accessed using HTTP GET will not cause a state change to the associated resource. This might allow attackers to bypass intended access restrictions and conduct resource modification and deletion attacks, since some applications allow GET to modify state.

扩展描述

The HTTP GET method and some other methods are designed to retrieve resources and not to alter the state of the application or resources on the server side. Furthermore, the HTTP specification requires that GET requests (and other requests) should not have side effects. Believing that it will be enough to prevent unintended resource alterations, an application may disallow the HTTP requests to perform DELETE, PUT and POST operations on the resource representation. However, there is nothing in the HTTP protocol itself that actually prevents the HTTP GET method from performing more than just query of the data. Developers can easily code programs that accept a HTTP GET request that do in fact create, update or delete data on the server. For instance, it is a common practice with REST based Web Services to have HTTP GET requests modifying resources on the server side. However, whenever that happens, the access control needs to be properly enforced in the application. No assumptions should be made that only HTTP DELETE, PUT, POST, and other methods have the power to alter the representation of the resource being accessed in the request.

相关缺陷

• cwe_Nature: ChildOf cwe_CWE_ID: 436 cwe_View_ID: 1000 cwe_Ordinal: Primary

• cwe_Nature: ChildOf cwe_CWE_ID: 436 cwe_View_ID: 699 cwe_Ordinal: Primary

适用平台

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

常见的影响

范围	影响	注释
Access Control	Gain Privileges or Assume Identity	An attacker could escalate privileges.
Integrity	Modify Application Data	An attacker could modify resources.
Confidentiality	Read Application Data	An attacker could obtain sensitive information.

可能的缓解方案

System Configuration

策略:

Configure ACLs on the server side to ensure that proper level of access control is defined for each accessible resource representation.

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