Incorrect token minting via payable multiplication overflow
Published Jun 24, 2021 · Updated Aug 4, 2024
Integer overflow in the MillionCoin payable fallback function allows remote attackers to mint an incorrect token amount via a forced Ether transfer. After checking the contract balance against the stage limit, the function multiplies the mutable balance by stagePrice without overflow protection and passes the wrapped result to mintCoins. Exploitation requires forcing Ether into the contract through selfdestruct after the balance check; the established consequence is incorrect token accounting.
Summary
What happened
Integer overflow in the MillionCoin payable fallback function allows remote attackers to mint an incorrect token amount via a forced Ether transfer. After checking the contract balance against the stage limit, the function multiplies the mutable balance by stagePrice without overflow protection and passes the wrapped result to mintCoins. Exploitation requires forcing Ether into the contract through selfdestruct after the balance check; the established consequence is incorrect token accounting.
The record
- CVE
- CVE-2020-17752
- Published
- Jun 24, 2021
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 24, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Forced-Ether balance multiplication proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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