Solidity News Saturday, March 10 Input data, Erc20 tokens, Loom recent fiddles & more…
Solidity News TLDR / Table of Contents
- Analyzing the ERC20 Short Address Attack – Eric Rafaloff
- input data, ERC20 tokens, address, Golem Project, input validation
- EthFiddle – Solidity in the Browser. Powered By Loom Network
- #1 Solidity code sharing site. Share Solidity code snippets with friends, or check out cool code snippets from around the web.
- Loom Recent Fiddles, Loom Network Deploy, Solidity IDE,
- Smart Contracts News Friday, March 9 Evm version, Target evm version, Smart contracts & more…
- gas estimator reports, trace vulnerabilities, source community contributors, real exploits, infamous Parity bug
- According to the post, when certain exchanges processed transactions of ERC20 tokens, input validation was not being performed on account address length.
- First and foremost, an attacker would need to manipulate the input data such that A) the provided address resolved to a valid account (ideally one owned by the attacker) and B) the amount specified was less than or equal to that of the exchanges own supply of ERC20 tokens.
- Lets say we have the following contract written in Solidity: – – If I wanted to send coins to another address, I would create a transaction with input data that would look something like this (with added line breaks for clarity): – – Now what would happen if the client…
- An exchange with a supply of ERC20 tokens must not be performing user input validation or proper padding when preparing transaction input data.
- The result would likely be the transfer of tokens to an Ethereum account that would never exist due to an invalid address (recall here that a ERC20 token transfer would be a change of state within the contract itself, not an actual transaction from an existing address to an invalid…
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