CWE-543: Use of Singleton Pattern Without Synchronization in a Multithreaded Context
The product uses the singleton pattern when creating a resource within a multithreaded environment.
How it's found
Use of Singleton Pattern Without Synchronization in a Multithreaded Context is a specific, narrowly defined instance of a broader pattern. Testers confirm it with targeted code review and a proof-of-concept input that exercises the exact code path this weakness describes.
The use of a singleton pattern may not be thread-safe.
Consequences
- Other, Modify Application Data
Mitigations
- Architecture and Design: Use the Thread-Specific Storage Pattern. See References.
- Implementation: Do not use member fields to store information in the Servlet. In multithreading environments, storing user data in Servlet member fields introduces a data access race condition.
- Implementation: Avoid using the double-checked locking pattern in language versions that cannot guarantee thread safety. This pattern may be used to avoid the overhead of a synchronized call, but in certain versions of Java (for example), this has been shown to be unsafe because it still introduces a race condition (CWE-209).
Where this fits in a TurboPentest engagement
TurboPentest's agentic pentest is powerful and covers a broad range of issues automatically. This particular class is best confirmed in a manual IntegSec engagement, where human pentesters apply deeper methodology and a larger context window than any automated pass.
Frequently asked questions
What is CWE-543?
The product uses the singleton pattern when creating a resource within a multithreaded environment.
How do you find Use of Singleton Pattern Without Synchronization in a Multithreaded Context?
Use of Singleton Pattern Without Synchronization in a Multithreaded Context is a specific, narrowly defined instance of a broader pattern. Testers confirm it with targeted code review and a proof-of-concept input that exercises the exact code path this weakness describes.
What is the impact of CWE-543?
Other, Modify Application Data
Does TurboPentest test for Use of Singleton Pattern Without Synchronization in a Multithreaded Context?
TurboPentest's agentic pentest is powerful and covers a broad range of issues automatically. This particular class is best confirmed in a manual IntegSec engagement, where human pentesters apply deeper methodology and a larger context window than any automated pass.
Related CWEs
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