CWE-636 未能安全地进行程序失效（Failing Open）

Not Failing Securely ('Failing Open')

结构: Simple

Abstraction: Class

状态: Draft

被利用可能性: unkown

基本描述

When the product encounters an error condition or failure, its design requires it to fall back to a state that is less secure than other options that are available, such as selecting the weakest encryption algorithm or using the most permissive access control restrictions.

扩展描述

By entering a less secure state, the product inherits the weaknesses associated with that state, making it easier to compromise. At the least, it causes administrators to have a false sense of security. This weakness typically occurs as a result of wanting to "fail functional" to minimize administration and support costs, instead of "failing safe."

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	Bypass Protection Mechanism	Intended access restrictions can be bypassed, which is often contradictory to what the product's administrator expects.

可能的缓解方案

Architecture and Design

策略:

Subdivide and allocate resources and components so that a failure in one part does not affect the entire product.

示例代码

例

Switches may revert their functionality to that of hubs when the table used to map ARP information to the switch interface overflows, such as when under a spoofing attack. This results in traffic being broadcast to an eavesdropper, instead of being sent only on the relevant switch interface. To mitigate this type of problem, the developer could limit the number of ARP entries that can be recorded for a given switch interface, while other interfaces may keep functioning normally. Configuration options can be provided on the appropriate actions to be taken in case of a detected failure, but safe defaults should be used.

分析过的案例

标识	说明	链接
CVE-2007-5277	The failure of connection attempts in a web browser resets DNS pin restrictions. An attacker can then bypass the same origin policy by rebinding a domain name to a different IP address. This was an attempt to "fail functional."	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5277
CVE-2006-4407	Incorrect prioritization leads to the selection of a weaker cipher. Although it is not known whether this issue occurred in implementation or design, it is feasible that a poorly designed algorithm could be a factor.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4407

Notes

分类映射

映射的分类名	ImNode ID	Fit	Mapped Node Name
OWASP Top Ten 2004	A7	CWE More Specific	Improper Error Handling

VULHUB ™