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Contract Cops
  • Mastering Ethereum Book
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    • Ethereum Cryptography - Cheatsheet
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  • Common Attack Vectors
    • Checking access control
    • Access control issues on critical functions
    • Account Existence Check for low level calls
    • Account Existence Check
    • Common attacks with contract/EOA addresses
    • Arithmetic under/overflow
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    • Bypassing contract check
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    • Code size check vulnerability
    • Constructors with Care
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    • Delegatecall
    • Delegatecall
    • Denial of Service (DoS)
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    • Entropy Illusion
    • External contract referencing
    • Flash Loan Attack
    • Floating Point and Precision
    • Function selector abuse
    • Function selector abuse
    • Smart contract gas griefing
    • Hash collision parameters
    • Hash Collisions With Multiple Variable Length Arguments
    • Imprecise arithmetic
    • Improper Array Deletion
    • Incorrect array deletion
    • Incorrect interface
    • Insufficient Gas Griefing
    • Loop through long arrays
    • Message call with hardcoded gas amount
    • Not enough gas for ether transfer
    • Precision Loss in Calculations
    • Oracle Manipulation
    • Public Burn Function
    • Read-only reentrancy
    • Race Conditions/Front Running
    • Reentrancy Attacks
    • Reentrancy
    • Requirement Violation
    • Right-To-Left-Override control character (U+202E)
    • Shadowing State Variables
    • Short Address / Parameter attack
    • Signature Malleability
    • Signature Replay
    • Transaction Order Dependence
    • Tx.Origin Authentication
    • Unchecked CALL Return Values
    • Unexpected ether
    • Uninitialized Storage Pointers
    • Unsafe Ownership Transfer
  • EIP's
    • EIP155
    • EIP55
  • PoW
    • Ethash
    • Scrypt - RFC 7914
  • Questions for self evaluation
    • Questions 23/04/2023 (Nr: 84)
    • Usability guide for questions
  • Frequently asked questions
    • What is the difference between transaction and message?
    • What is the use of a interface or function without implementation?
  • UsefulResources
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  1. Common Attack Vectors

Imprecise arithmetic

Just like in any programming language, Solidity supports Substraction, Multiplication, Division, Modulus and Exponential (x**y)

In the case of integer division, the result may be truncated, which would lead to an imprecise calculation and potentially a security issue within the business logic.

To prevent this issue, if there is both multiplication and division to be done, multiplication should be placed first.

  • (a * b) / c is correct

  • (a / b) * c is incorrect

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Last updated 2 years ago