Canaries help to implement what protective mechanisms in the stack?

The correct answer is D. Integrity. When the return pointer gets pushed on the stack, the system calculates a keyed hash of the return pointer. This keyed hash result, known as a canary, will be used later as an integrity check of the return pointer to make sure it hasn't been altered by an attacker.

Vulnerability Exploitation & Privilege Escalation

Question

Options

AAvailability
BConfidentiality
CSecrecy
DIntegrity

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(59 responses)

A
2% (1)
B
5% (3)
C
2% (1)
D
92% (54)

Explanation

When the return pointer gets pushed on the stack, the system calculates a keyed hash of the return pointer. This keyed hash result, known as a canary, will be used later as an integrity check of the return pointer to make sure it hasn't been altered by an attacker.

Topics

#stack canaries#buffer overflow protection#memory integrity#exploit mitigation

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