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Scan ContractView Demo Report
Escrow.sol
Solidity
// Analyzing smart contract logic...
function bridgeFunds(address target, bytes calldata data, uint256 amount) external {
token.approve(target, amount);
uint256 before = token.balanceOf(address(this));
(bool ok,) = target.call(data);
require(ok, CALL_FAILED);
require(before - token.balanceOf(address(this)) == amount);
}
Unsafe user-controlled external call with token approval
The contract approves tokens and then performs a low-level external call using user-supplied target and calldata. This allows an attacker to execute arbitrary logic (e.g. NFT transfers) while the contract still holds custodial assets.
GardaChain Analysis

[High] Arbitrary External Call Enables Asset Theft

The bridgeFunds function approves tokens and then executes a user-controlled external call via target.call(data). Because both the target address and calldata are untrusted, an attacker can inject malicious calls (e.g. ERC721 transfers) that execute with the contract's approvals and asset custody.

Recommendation

Restrict external calls to a strict set of whitelisted bridge adapters and validate function selectors before execution. Avoid approving tokens to untrusted addresses and do not expose arbitrary call() paths.
require(allowedTargets[target], UNTRUSTED_TARGET);
require(allowedSelectors[bytes4(data[:4])], BAD_SELECTOR);

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