CWE-1063: Creation of Class Instance within a Static Code Block
Learn about CWE-1063 (Creation of Class Instance within a Static Code Block), its security impact, exploitation methods, and prevention guidelines.
What is Creation of Class Instance within a Static Code Block?
• Overview: CWE-1063 refers to the creation of a class instance within a static code block, which initializes a data element at the class level before it may be necessary. This can lead to inefficient use of resources, slowing down the application unnecessarily, and potentially creating vulnerabilities if the code is accessed by an attacker.
• Exploitation Methods:
- Attackers may exploit this by triggering the static block to execute multiple times, potentially causing denial-of-service (DoS) conditions due to resource exhaustion.
- Common attack patterns include forcing the application to repeatedly initialize unnecessary resources, leading to performance degradation.
• Security Impact:
- Direct consequences include reduced application performance and increased resource consumption.
- Potential cascading effects include increased vulnerability to DoS attacks if resource exhaustion is achieved.
- Business impact may involve degraded user experience, increased operational costs, and potential downtime.
• Prevention Guidelines:
- Specific code-level fixes involve delaying the initialization of class instances until they are actually needed, possibly using lazy initialization patterns.
- Security best practices include reviewing static initialization blocks to ensure they do not perform resource-intensive operations prematurely.
- Recommended tools and frameworks include static analysis tools to identify and refactor inefficient static block usage.
Technical Details
Likelihood of Exploit: Not specified
Affected Languages: Not specified
Affected Technologies: Not specified