Weakness · Medium
CWE-487: Reliance on Package-level Scope
What it is
Java packages are not inherently closed; therefore, relying on them for code security is not a good practice.
- Severity (our rating)
- Medium
- Likelihood of exploit
- Medium
- Introduced during
- Implementation
- Exploited in the wild
- No CVE in CISA's catalog
In more detail
The purpose of package scope is to prevent accidental access by other parts of a program. This is an ease-of-software-development feature but not a security feature.
What an attacker can do
- Read Application Data (Confidentiality)
- Modify Application Data (Integrity)
How to prevent it
Architecture and Design
- Data should be private static and final whenever possible. This will assure that your code is protected by instantiating early, preventing access and tampering.
How to find it
- 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.)
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Start freeSource: MITRE Common Weakness Enumeration, CWE version 4.19.1. CWE is a trademark of The MITRE Corporation.