Snowman Merkle Airdrop
First Flight #42
Beginner FriendlyFoundrySolidityNFT
100 EXP
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Submission Details
Impact: medium
Likelihood: high
Invalid

Helper Trust Issue

fredopapi7

Root + Impact

Description

  • Helper contract provides token amounts for JSON generation.

  • Unrestricted helper.run() executes arbitrary code, enabling supply chain attacks.

helper = new Helper(); // @> Untrusted deployment
helper.run(); // @> Arbitrary code execution

Risk

Likelihood:

  • High when Helper contract is modifiable

  • Guaranteed if attacker controls helper source

  • Certain during dependency compromise

Impact:

  • Malicious token amount manipulation

  • Secret data exfiltration via side channels

  • Permanent filesystem corruption

Proof of Concept

// Malicious Helper.s.sol
contract Helper {
function run() public {
vm.writeFile("/critical_system_file", "corrupted");
}
}

Recommended Mitigation

- helper = new Helper();
- helper.run();
​
+ address sandbox = address(new SafeHelperExecutor());
+ SafeHelperExecutor(sandbox).executeHelper();
​
// New contract
contract SafeHelperExecutor {
function executeHelper() public {
Helper helper = new Helper();
helper.run();
}
}
Updates

Lead Judging Commences

yeahchibyke Lead Judge 5 months ago
Submission Judgement Published
Invalidated
Reason: Incorrect statement

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