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Tracto ERC20 Integer Overflow

Tracto ERC20 Integer Overflow
Posted Jul 26, 2018
Authored by Zhihua Yao

Tracto ERC20 suffers from an integer overflow vulnerability.

tags | advisory, overflow
advisories | CVE-2018-14063
MD5 | b2ec04f47b4a1fab92c7f1babe0c729c

Tracto ERC20 Integer Overflow

Change Mirror Download
Hello,I found an integer overflow in increaseApproval function.And it doesn't use the safe function to add value.
code addresss:
https://etherscan.io/address/0x30ceCB5461A449A90081F5a5F55db4e048397BAB
vuln code:

function increaseApproval (address _spender, uint _addedValue)
returns (bool success) {
//allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
allowed[msg.sender][_spender] += _addedValue; //integer overflow
Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
This issue has been already applied for CVE-2018-14063


The issue link :
https://github.com/tracto2/Tracto-ERC20/issues/1

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