TempleGold
TempleDAO
Foundry
25,000 USDC
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Submission Details
Severity: low
Valid

Cross-Chain Message Encoding/Decoding Mismatch in #TempleTeleporter Contract

0xPkhatri4

Summary

The contract TempleTeleporter.sol inconsistently handles address encoding and decoding across its cross-chain messaging functions, which could potentially lead to transaction failures, possible loss of funds, and complete system breakdown.

Vulnerability Details

In the teleport function, the recipient address is encoded using addressToBytes32():

bytes memory _payload = abi.encodePacked(to.addressToBytes32(), amount);

However, the _lzReceive function attempts to decode the address directly

(address _recipient, uint256 _amount) = abi.decode(_payload, (address, uint256));

Additionally, in the quote function, the address is not encoded using addressToBytes32().

return _quote(_dstEid, abi.encodePacked(_to, _amount), _options, false);

This mismatch causes the _lzReceive function to incorrectly interpret the incoming data, as it's expecting a 20-byte address but receiving a 32-byte value.

Impact

  1. This vulnerability will cause all incoming cross-chain transfers to fail, rendering the core functionality of the contract inoperable.

  2. this will lead to token burn but not minted to other chain and user will loss fund

  3. The quote function also calculates the fee incorrectly.

Tools Used

Manual code review

Recommendations

  1. Update the _lzReceive function to correctly decode the bytes32 address:

function _lzReceive(
Origin calldata /*_origin*/,
bytes32 /*_guid*/,
bytes calldata _payload,
address /*_executor,*/,
bytes calldata /*_extraData */
) internal override {
(bytes32 _recipientBytes32, uint256 _amount) = abi.decode(_payload, (bytes32, uint256));
address _recipient = address(uint160(uint256(_recipientBytes32)));
temple.mint(_recipient, _amount);
}

  1. Update the quote function to correctly encode the bytes32 address:

function quote(
uint32 _dstEid,
address _to,
uint256 _amount,
bytes memory _options
) external view returns (MessagingFee memory fee) {
return _quote(_dstEid, abi.encodePacked(_to.addressToBytes32(), _amount), _options, false);
}
Updates

Lead Judging Commences

inallhonesty Lead Judge 12 months ago
Submission Judgement Published
Validated
Assigned finding tags:

Incorrect payload bytes in `quote()` they use `abi.encodePacked(_to, _amount)` instead of `abi.encodePacked(_to.addressToBytes32(), _amount)`

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