Improper Control of Dynamically-Managed Code Resources
Incomplete Class
Structure: Simple
Description
The product does not properly restrict reading from or writing to dynamically-managed code resources such as variables, objects, classes, attributes, functions, or executable instructions or statements.
Many languages offer powerful features that allow the programmer to dynamically create or modify existing code, or resources used by code such as variables and objects. While these features can offer significant flexibility and reduce development time, they can be extremely dangerous if attackers can directly influence these code resources in unexpected ways.
Common Consequences 2
Scope: Integrity
Impact: Execute Unauthorized Code or Commands
Scope: OtherIntegrity
Impact: Varies by ContextAlter Execution Logic
Detection Methods 1
FuzzingHigh
Fuzz testing (fuzzing) is a powerful technique for generating large numbers of diverse inputs - either randomly or algorithmically - and dynamically invoking the code with those inputs. Even with random inputs, it is often capable of generating unexpected results such as crashes, memory corruption, or resource consumption. Fuzzing effectively produces repeatable test cases that clearly indicate bugs, which helps developers to diagnose the issues.Potential Mitigations 2
Phase: Implementation
Strategy: Input Validation
For any externally-influenced input, check the input against an allowlist of acceptable values.
Phase: ImplementationArchitecture and Design
Strategy: Refactoring
Refactor the code so that it does not need to be dynamically managed.
Observed Examples 5
CVE-2022-2054Python compiler uses eval() to execute malicious strings as Python code.
CVE-2018-1000613Cryptography API uses unsafe reflection when deserializing a private key
CVE-2015-8103Deserialization issue in commonly-used Java library allows remote execution.
CVE-2006-7079Chain: extract used for register_globals compatibility layer, enables path traversal (Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'))
CVE-2012-2055Source version control product allows modification of trusted key using mass assignment.
Modes of Introduction
Architecture and Design
Implementation
Related Weaknesses