SY0-501 · Question #22
Refer to the following code: Which of the following vulnerabilities would occur if this is executed?
The correct answer is D. Missing null check. A 'missing null check' is a vulnerability where an application fails to validate if a reference is null before attempting to use it, which can lead to runtime errors or system instability.
Question
Refer to the following code:
Which of the following vulnerabilities would occur if this is executed?
Options
- APage exception
- BPointer dereference
- CNullPointerException
- DMissing null check
How the community answered
(22 responses)- A9% (2)
- B14% (3)
- C5% (1)
- D73% (16)
Why each option
A 'missing null check' is a vulnerability where an application fails to validate if a reference is null before attempting to use it, which can lead to runtime errors or system instability.
A page exception is a low-level operating system or hardware error related to memory access violations, which is distinct from a programmatic missing null check at the application logic level.
While a missing null check can result in an invalid pointer dereference, the vulnerability itself is the absence of the validation check rather than the act of dereferencing.
A NullPointerException is an outcome or symptom that occurs at runtime when a null reference is improperly accessed, which is typically a direct consequence of a missing null check, not the vulnerability itself.
A "missing null check" is a direct vulnerability because it represents a programming flaw where code attempts to interact with an object reference that might be null without first verifying its state. This oversight can lead to a program attempting to dereference a null pointer, causing runtime exceptions like NullPointerException.
Concept tested: Null reference handling vulnerability
Source: https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/exceptions/nullreferenceexception
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