CCA Smart Contract Auditing Questions and Answers

Question 1

An auditor is reviewing a smart contract's token distribution function, which iterates through a large, externally-provided array of recipient addresses to execute transfers.
As the number of recipients grows, transactions calling this function begin to fail consistently.
What is the most likely vulnerability?

Accepted Answer

Denial of Service (DoS) due to block gas limit

Answer

Reentrancy attack

Answer

Timestamp dependence

Answer

Integer underflow

Question 2

Which of the following tools is an auditor most likely to use for static analysis of Solidity code, which involves examining the contract's code without executing it to find common vulnerabilities and bad practices?

Accepted Answer

Slither

Answer

Ganache

Answer

Hardhat

Answer

Foundry

Question 3

While auditing a system using a transparent proxy for upgradability, an auditor discovers the implementation contract's `initialize` function is public and lacks protection. Why does this represent a critical security risk?

Accepted Answer

An attacker could call `initialize` on the implementation contract directly, take ownership, and potentially self-destruct it, bricking the proxy.

Answer

It allows anyone to bypass the proxy and mint new tokens directly.

Answer

It can be exploited to perform a flash loan attack against the proxy's balance.

Answer

It violates ERC-721 standards, causing incompatibility with marketplaces.

Question 4

An auditing firm is engaged to provide the highest possible level of assurance for a critical DeFi protocol's core logic. The technique they plan to use involves creating a formal specification of the contract's desired properties and using mathematical methods to prove that the code adheres to this specification under all possible conditions. What is this technique called?

Accepted Answer

Formal verification

Answer

Fuzz testing

Answer

Dynamic analysis

Answer

Manual code review

Question 5

A smart contract written in an older version of Solidity (pre-0.8.0) calculates a user's reward by multiplying their stake amount by a `rewardRate`. An auditor flags a potential vulnerability where a user with a very large stake could interact with a high `rewardRate` and receive a near-zero reward. This is a classic example of what vulnerability?

Accepted Answer

Integer overflow

Answer

Access control violation

Answer

Unchecked external call

Answer

Gas griefing

Question 6

When delivering a final smart contract audit report to a client's development team, which of the following sections is the most critical for enabling them to fix the identified security flaws?

Accepted Answer

Detailed findings that include a vulnerability description, severity rating, code location, and actionable remediation guidance.

Answer

A summary of the total person-hours spent on the audit engagement.

Answer

The names and qualifications of the auditors who performed the review.

Answer

A list of the automated static and dynamic analysis tools that were used during the audit process.