CWE-773 对活跃文件描述符或句柄丧失索引

Missing Reference to Active File Descriptor or Handle

结构: Simple

Abstraction: Variant

状态: Incomplete

被利用可能性: unkown

基本描述

The software does not properly maintain references to a file descriptor or handle, which prevents that file descriptor/handle from being reclaimed.

扩展描述

This can cause the software to consume all available file descriptors or handles, which can prevent other processes from performing critical file processing operations.

相关缺陷

• cwe_Nature: ChildOf cwe_CWE_ID: 771 cwe_View_ID: 1000 cwe_Ordinal: Primary

• cwe_Nature: ChildOf cwe_CWE_ID: 771 cwe_View_ID: 699 cwe_Ordinal: Primary

常见的影响

范围	影响	注释
Availability	DoS: Resource Consumption (Other)	An attacker that can influence the allocation of resources that are not properly maintained could deplete the available resource pool and prevent all other processes from accessing the same type of resource.

可能的缓解方案

MIT-47 ['Operation', 'Architecture and Design']

策略: Resource Limitation

Use resource-limiting settings provided by the operating system or environment. For example, when managing system resources in POSIX, setrlimit() can be used to set limits for certain types of resources, and getrlimit() can determine how many resources are available. However, these functions are not available on all operating systems.
When the current levels get close to the maximum that is defined for the application (see CWE-770), then limit the allocation of further resources to privileged users; alternately, begin releasing resources for less-privileged users. While this mitigation may protect the system from attack, it will not necessarily stop attackers from adversely impacting other users.
Ensure that the application performs the appropriate error checks and error handling in case resources become unavailable (CWE-703).

分类映射

映射的分类名	ImNode ID	Fit	Mapped Node Name
Software Fault Patterns	SFP14		Failure to release resource
CERT C Secure Coding	FIO42-C	CWE More Abstract	Close files when they are no longer needed

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