COMMON WEAKNESS ENUMERATIONIncomplete

CWE-913

Improper Control of Dynamically-Managed Code Resources

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.

Abstraction

Class

Structure

Simple

Likelihood of Exploit

Medium

Understand the problem

What is the problem?

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.

Extended description

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.

Root cause

How and when does the problem arise?

Lifecycle phase

Architecture and Design

Lifecycle phase

Implementation

Risk

What does successful exploitation lead to?

Execute Unauthorized Code or Commands

Affected security scopes: Integrity

Varies by ContextAlter Execution Logic

Affected security scopes: Other, Integrity

Defence

How is it prevented and fixed?

Implementation

Input Validation

Detail
For any externally-influenced input, check the input against an allowlist of acceptable values.

Implementation · Architecture and Design

Refactoring

Detail
Refactor the code so that it does not need to be dynamically managed.

Verification

How is it detected?

Fuzzing

High
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.