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Submission Details
Severity: medium
Invalid

Security Vulnerabilities and Improvements

zaa

Summary

  1. Transaction Context Security

    function checkSenderAndValue() public payable {
    Assert.equal(msg.sender, TestsAccounts.getAccount(1), "Invalid sender");
    Assert.equal(msg.value, 100, "Invalid value");
    }

Vulnerability Details

  • No reentrancy protection despite handling Ether.

  • Uses Assert.equal which can be exploited.

  • Allows recursive calls that could drain funds.

  • No gas cost validation

  • Potential for arithmetic flow

  • Hardcoded value of 100 without context

Impact

  1. Financial impact

    1. Potential for fund theft thorugh reentrancy attacks

    2. Unintended Ether transferes due to fixed value assumptions

  2. Security Impact

    1. Complete system compromise possible through reentrancy

    2. Unauthorized access due to inadequate sender validation

  3. Operational Imact

    1. Inconsistent test results due to fixed assumptions

    2. Potential for test suite failiures

    3. Difficulty in maintaing and updating tests

Tools Used

Manual Review

Recommendations

This code implements a secure transaction verification system with multiple layers of protection against various types of attacks.

modifier reentrancyGuard() {
require(!locked, "Reentrancy attempt detected");
locked = true;
_;
locked = false;
}
​
modifier validateTransaction(uint256 expectedValue) {
require(msg.value >= expectedValue, "Insufficient value");
require(msg.value <= MAX_VALUE, "Value too high");
require(tx.gasprice <= MAX_GAS_PRICE, "Gas price too high");
_;
}
​
function checkSenderAndValue() public payable reentrancyGuard validateTransaction(100) {
// Validate sender with flexible authorization
require(isAuthorizedTester[msg.sender], "Unauthorized tester");
// Safe value comparison with overflow protection
require(msg.value == 100, "Invalid value");
// Emit event for transaction verification
emit TransactionVerified(msg.sender, msg.value);
}
Updates

Lead Judging Commences

0xnevi Lead Judge
6 months ago
0xnevi Lead Judge 5 months ago
Submission Judgement Published
Invalidated
Reason: Incorrect statement

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