Détail du CWE-585

CWE-585

Empty Synchronized Block
Draft
2006-12-15
00h00 +00:00
2025-04-03
00h00 +00:00
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Nom: Empty Synchronized Block

The product contains an empty synchronized block.

Description du CWE

An empty synchronized block does not actually accomplish any synchronization and may indicate a troubled section of code. An empty synchronized block can occur because code no longer needed within the synchronized block is commented out without removing the synchronized block.

Informations générales

Modes d'introduction

Implementation

Plateformes applicables

Langue

Name: Java (Undetermined)

Conséquences courantes

Portée Impact Probabilité
OtherOther

Note: An empty synchronized block will wait until nobody else is using the synchronizer being specified. While this may be part of the desired behavior, because you haven't protected the subsequent code by placing it inside the synchronized block, nothing is stopping somebody else from modifying whatever it was you were waiting for while you run the subsequent code.

Mesures d’atténuation potentielles

Phases : Implementation
When you come across an empty synchronized statement, or a synchronized statement in which the code has been commented out, try to determine what the original intentions were and whether or not the synchronized block is still necessary.

Méthodes de détection

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.)
Efficacité : High

Notes de cartographie des vulnérabilités

Justification : 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.
Commentaire : 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.

Références

REF-478

Intrinsic Locks and Synchronization (in Java)
https://docs.oracle.com/javase/tutorial/essential/concurrency/locksync.html

Soumission

Nom Organisation Date Date de publication Version
CWE Community 2006-12-15 +00:00 2006-12-15 +00:00 Draft 5

Modifications

Nom Organisation Date Commentaire
Eric Dalci Cigital 2008-07-01 +00:00 updated Potential_Mitigations, Time_of_Introduction
CWE Content Team MITRE 2008-09-08 +00:00 updated Relationships, Other_Notes
CWE Content Team MITRE 2009-05-27 +00:00 updated Common_Consequences, Demonstrative_Examples, Description, Other_Notes, Potential_Mitigations, References
CWE Content Team MITRE 2011-06-01 +00:00 updated Common_Consequences
CWE Content Team MITRE 2012-05-11 +00:00 updated Relationships
CWE Content Team MITRE 2014-07-30 +00:00 updated Relationships, Taxonomy_Mappings
CWE Content Team MITRE 2017-11-08 +00:00 updated Relationships
CWE Content Team MITRE 2019-01-03 +00:00 updated Relationships, Weakness_Ordinalities
CWE Content Team MITRE 2020-02-24 +00:00 updated Relationships, Type
CWE Content Team MITRE 2023-01-31 +00:00 updated Description
CWE Content Team MITRE 2023-04-27 +00:00 updated Detection_Factors, References, Relationships, Type
CWE Content Team MITRE 2023-06-29 +00:00 updated Mapping_Notes
CWE Content Team MITRE 2024-02-29 +00:00 updated Demonstrative_Examples
CWE Content Team MITRE 2025-04-03 +00:00 updated Demonstrative_Examples