名称: Signal Handler Use of a Non-reentrant Function

The product defines a signal handler that calls a non-reentrant function.

基本信息

背景详情

引入方式

Implementation

适用平台

编程语言

名称： C (Undetermined)
名称： C++ (Undetermined)

常见后果

影响范围	影响	可能性
Integrity Confidentiality Availability	Execute Unauthorized Code or Commands 注意： It may be possible to execute arbitrary code through the use of a write-what-where condition.
Integrity	Modify Memory, Modify Application Data 注意： Many functions are not reentrant, but some of them can result in the corruption of memory if they are used in a signal handler.
Availability	Unexpected State, DoS: Crash, Exit, or Restart 注意： This can lead to an unexpected system state and unpredictable results with a variety of potential consequences depending on context, including program crash.

观察示例

参考资料	描述
CVE-2005-0893	signal handler calls function that ultimately uses malloc()
CVE-2004-2259	SIGCHLD signal to FTP server can cause crash under heavy load while executing non-reentrant functions like malloc/free.

潜在缓解措施

Phases : Requirements
Require languages or libraries that provide reentrant functionality, or otherwise make it easier to avoid this weakness.
Phases : Architecture and Design
Design signal handlers to only set flags rather than perform complex functionality.
Phases : Implementation
Ensure that non-reentrant functions are not found in signal handlers.
Phases : Implementation
Use sanity checks to reduce the timing window for exploitation of race conditions. This is only a partial solution, since many attacks might fail, but other attacks still might work within the narrower window, even accidentally.

检测方法

Automated Static Analysis

Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)
有效性 : High

漏洞映射说明

依据 : This CWE entry is at the Variant level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.
备注 : Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.

参考资料

REF-18

The CLASP Application Security Process
Secure Software, Inc..
https://cwe.mitre.org/documents/sources/TheCLASPApplicationSecurityProcess.pdf

REF-62

The Art of Software Security Assessment
Mark Dowd, John McDonald, Justin Schuh.

提交记录

名称	组织	日期	发布日期	Version
CLASP		2006-07-19 +00:00	2006-07-19 +00:00	Draft 3

修改记录

名称	组织	日期	备注
Eric Dalci	Cigital	2008-07-01 +00:00	updated Time_of_Introduction
CWE Content Team	MITRE	2008-09-08 +00:00	updated Applicable_Platforms, Common_Consequences, Description, Relationships, Other_Notes, Taxonomy_Mappings
CWE Content Team	MITRE	2008-11-24 +00:00	updated Relationships, Taxonomy_Mappings
CWE Content Team	MITRE	2010-09-27 +00:00	updated Relationships
CWE Content Team	MITRE	2010-12-13 +00:00	updated Demonstrative_Examples, Description, Name, Observed_Examples, Other_Notes, Potential_Mitigations, Relationships
CWE Content Team	MITRE	2011-06-01 +00:00	updated Common_Consequences, Relationships, Taxonomy_Mappings
CWE Content Team	MITRE	2011-06-27 +00:00	updated Common_Consequences
CWE Content Team	MITRE	2011-09-13 +00:00	updated Relationships, Taxonomy_Mappings
CWE Content Team	MITRE	2012-05-11 +00:00	updated References, Relationships, Taxonomy_Mappings
CWE Content Team	MITRE	2012-10-30 +00:00	updated Demonstrative_Examples
CWE Content Team	MITRE	2014-07-30 +00:00	updated Relationships, Taxonomy_Mappings
CWE Content Team	MITRE	2017-11-08 +00:00	updated Observed_Examples, Relationships, Taxonomy_Mappings
CWE Content Team	MITRE	2019-01-03 +00:00	updated Relationships, Taxonomy_Mappings
CWE Content Team	MITRE	2020-02-24 +00:00	updated Description, References, Relationships
CWE Content Team	MITRE	2020-12-10 +00:00	updated Common_Consequences
CWE Content Team	MITRE	2023-01-31 +00:00	updated Description
CWE Content Team	MITRE	2023-04-27 +00:00	updated Detection_Factors, Relationships, Time_of_Introduction
CWE Content Team	MITRE	2023-06-29 +00:00	updated Mapping_Notes
CWE Content Team	MITRE	2023-10-26 +00:00	updated Demonstrative_Examples
CWE Content Team	MITRE	2025-04-03 +00:00	updated Demonstrative_Examples
CWE Content Team	MITRE	2025-12-11 +00:00	updated Weakness_Ordinalities
CWE Content Team	MITRE	2026-10-28 +00:00	updated Background_Details, Common_Consequences, Description

CWE-479 详情

CWE-479