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Submission Details
Severity: high
Invalid

Insufficient Event Emissions for Critical Operations

hamadiftikhar

Summary

The IBlockHashRetain.vyi interface lacks comprehensive event emissions for critical operations This severely impacts protocol transparency and monitoring capabilities.

Vulnerability Details

Current implementation only has basic events:

event CommitBlockHash:
committer: indexed(address)
number: indexed(uint256)
hash: bytes32
​
event ApplyBlockHash:
number: indexed(uint256)
hash: bytes32

Critical missing events:

  1. No events for failed operations

  2. Missing validation status events

  3. No events for state transitions

  4. Absence of emergency operation events

  5. No events for parameter updates

From IBlockHashRetain.vyi:

@external
def commit() -> uint256:
"""
@notice Commit (and apply) a block hash/state root.
@dev Same as `apply()` but saves committer
"""
# No events for validation failures
...
​
@external
def apply() -> uint256:
"""
@notice Apply a block hash/state root.
"""
# No events for state transitions
...

Impact

  • Limited ability to monitor protocol health

  • Difficult to track failed operations

  • No transparency for validation processes

  • Impossible to audit state changes off-chain

  • Reduced security through obscurity

Tools Used

  • Manual Review

Recommendations

  1. Implement comprehensive event system:

# Additional events
event CommitAttemptFailed:
committer: indexed(address)
number: indexed(uint256)
reason: String[100]
​
event ValidationStatus:
block_number: indexed(uint256)
status: bool
validator: indexed(address)
​
event EmergencyAction:
action_type: String[32]
initiator: indexed(address)
timestamp: uint256
​
event StateTransition:
previous_state: uint8
new_state: uint8
block_number: indexed(uint256)
​
event ParameterUpdate:
param_name: String[32]
old_value: uint256
new_value: uint256
updater: indexed(address)
​
@external
def commit() -> uint256:
"""
@notice Enhanced commit with events
"""
try:
# Existing logic
log CommitBlockHash(msg.sender, block_number, block_hash)
except:
log CommitAttemptFailed(msg.sender, block_number, "Validation failed")
raise
​
@external
def apply() -> uint256:
"""
@notice Enhanced apply with state tracking
"""
old_state: uint8 = self.current_state
# Existing logic
log StateTransition(old_state, self.current_state, block.number)
log ApplyBlockHash(block_number, block_hash)
​
@external
def update_parameters(_name: String[32], _value: uint256):
"""
@notice Parameter updates with tracking
"""
old_value: uint256 = self.parameters[_name]
self.parameters[_name] = _value
log ParameterUpdate(_name, old_value, _value, msg.sender)

  1. Add validation events:

@external
def validate_block_hash(_block_number: uint256) -> bool:
"""
@notice Validate block hash with events
"""
is_valid: bool = self._validate_hash(_block_number)
log ValidationStatus(_block_number, is_valid, msg.sender)
return is_valid

  1. Implement emergency event system:

@external
def emergency_action(_action: String[32]):
"""
@notice Emergency actions with logging
"""
assert msg.sender == self.admin, "Not admin"
log EmergencyAction(_action, msg.sender, block.timestamp)

These enhancements provide:

  • Complete operational transparency

  • Better monitoring capabilities

  • Improved auditability

  • Clear state transition tracking

  • Enhanced security through visibility

Updates

Lead Judging Commences

0xnevi Lead Judge
6 months ago
0xnevi Lead Judge 5 months ago
Submission Judgement Published
Invalidated
Reason: Incorrect statement

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