[prev in list] [next in list] [prev in thread] [next in thread] 

List:       full-disclosure
Subject:    [FD] Integer overflow in SunContract
From:       姚� <zhihua.yao () dbappsecurity ! com ! cn>
Date:       2018-07-25 11:32:17
Message-ID: 6d3b5d9a.4f4.164d1360d5d.Coremail.zhihua.yao () dbappsecurity ! com ! cn
[Download RAW message or body]

I have found an integer overflow in mintTokens,the supply variable could overflow,because of \
the _amount variable is controlled by us and can eventually cause supply overflow to zero.


vuln code:


  function mintTokens(address _to, uint256 _amount) {         
    if (msg.sender != icoContractAddress) throw;            // Only ICO address can mint tokens \
  if (restrictedAddresses[_to]) throw;                    // Throw if user wants to send to \
restricted address         if (balances[_to] + _amount < balances[_to]) throw;     // Check for \
overflows  supply += _amount;   //integer overflow                                     // \
Update total supply  balances[_to] += _amount;                               // Set minted \
coins to target  Mint(_to, _amount);                                     // Create Mint event   \
  Transfer(0x0, _to, _amount);                            // Create Transfer event from 0x
  } 


contract address
https://etherscan.io/address/0xF4134146AF2d511Dd5EA8cDB1C4AC88C57D60404#code


reference link:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14576
https://github.com/SunContract/SmartContracts/issues/1



--

-----------------------------------------------------------------


杭州安恒信息技术股份有限公司
明鉴事业部-策略引擎部
手机:13588722924
邮箱:zhihua.yao@dbappsecurity.com.cn
公司网址:http://www.dbappsecurity.com.cn
官方微信:DBAPP2013   客服热线:400-6059-110
联系地址:杭州市滨江区通和路68号中财大厦15层（310051）
-----------------------------------------------------------------

_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: http://seclists.org/fulldisclosure/


[prev in list] [next in list] [prev in thread] [next in thread]