Submission Details
Impact:
Likelihood:
Non Contract Addresses Can Be Whitelisted as Stake Tokens
Author Revealed upon completion
Root + Impact
Description
The owner may accidentally whitelist an EOA instead of an ERC-20 token contract. Users attempting to stake the invalid token may encounter transaction failures, disrupting staking operations.
// Root cause in the codebase with @> marks to highlight the relevant section
Risk
Likelihood:
Likelihood
Medium
Whitelisting tokens is a recurring administrative action and is susceptible to operator mistakes.
Impact:
-
Impact 1
-
Impact 2
Proof of Concept
The function verifies only that the token address is non-zero.
It never confirms that the supplied address actually contains ERC-20 contract code.
function test_PoC_StakeTokenAllowed_AcceptsEOA_NoCodeCheck() public {
address eoa = makeAddr("eoaAsToken");
assertEq(eoa.code.length, 0);
vm.prank(owner);
factory.setStakeTokenAllowed(eoa, true); // succeeds — non-token address allowlisted
assertTrue(factory.allowedStakeToken(eoa));
}
}
Recommended Mitigation
Mitigation
Verify that the supplied token address contains deployed contract code.
- remove this code
function setStakeTokenAllowed(address token, bool allowed) external onlyOwner {\
if (token == address(0)) revert ZeroAddress();\
allowedStakeToken\[token] = allowed;\
emit StakeTokenAllowedUpdated(token, allowed);\
}
+ add this code
function setStakeTokenAllowed(address token, bool allowed)
external
onlyOwner
{
if (token == address(0)) revert ZeroAddress();
if (token.code.length == 0) revert NotAContract();
allowedStakeToken[token] = allowed;
emit StakeTokenAllowedUpdated(token, allowed);
Prize pool breakdown
Total prize
7.25 ETH
nSLOC
5890
ETH / LOC
6
1.25
Live
The contest is live. Earn rewards by submitting a finding.
Appeals
This is your time to appeal against judgements on your submissions.
View preliminary resultsAppeals Review
Appeals are being carefully reviewed by our judges.
Rewards Distribution
The contest is complete and the rewards are being distributed.