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Submission Details
Severity: high
Invalid

Unauthorized Access to `updateVaultGroups` Function

chainsentryaudits

Summary

The FundFlowController.sol contract contains a critical vulnerability where the updateVaultGroups function is publicly accessible without proper access control. This oversight allows any external account to invoke the function, potentially disrupting the contract's normal operations and causing unintended state changes. Such unrestricted access can lead to significant security risks, including denial of service (DoS) attacks and manipulation of vault group states.

Vulnerability Details

Unauthorized Invocation of updateVaultGroups

Function Accessibility

function updateVaultGroups() external {
// Function logic...
}

Explanation:
The updateVaultGroups function is declared as external without any access control modifiers (e.g., onlyOwner, onlyAuthorized). This means that any external account can call this function at any time.

Lack of Access Control Modifiers

function updateVaultGroups() external {
// Function logic...
}

Explanation:
Without access control modifiers, there are no restrictions on who can call updateVaultGroups. Typically, functions that modify critical contract states should be restricted to authorized roles to prevent misuse.

Potential for Denial of Service (DoS)

function updateVaultGroups() external {
// Intensive computations and state changes
}

Explanation:
An attacker could repeatedly invoke updateVaultGroups, consuming excessive gas and potentially causing the function to fail. This could disrupt the contract's ability to manage vault groups effectively, leading to a denial of service for legitimate users.

Manipulation of Vault Groups

function updateVaultGroups() external {
// Logic that updates vault group states based on conditions
}

Explanation:
Even though internal checks exist within the function to validate state transitions, the absence of access restrictions allows malicious actors to exploit these conditions. They might trigger unintended state changes that affect fund allocations and the integrity of vault groups.

Expected Outcome

When an unauthorized user calls updateVaultGroups, the contract may:

  • Exhaust Gas: Continuous calls can lead to gas exhaustion, making the function prohibitively expensive to execute.

  • Disrupt Operations: Frequent state changes can result in inconsistent vault group states, affecting fund allocations and overall platform stability.

  • Enable State Manipulation: Attackers might find ways to manipulate the conditions under which vault groups are updated, leading to unintended financial consequences.

Impact

The lack of access control on the updateVaultGroups function poses several significant risks:

  • Service Disruption: Attackers can cause the function to fail or behave unpredictably, disrupting the platform's core functionalities.

  • Financial Loss: Manipulation of vault group states can lead to improper fund allocations, potentially resulting in financial losses for users and the platform.

  • Erosion of Trust: Repeated disruptions and potential financial discrepancies can erode user trust, impacting the platform's reputation and user base.

Given the critical nature of vault group management in the staking and fund flow mechanisms, this vulnerability is classified as High severity.

Tools Used

  • Manual Review

  • Foundry

Recommendations

To mitigate the identified vulnerability and enhance the security of the FundFlowController.sol contract, the following measures are recommended:

1. Implement Access Control Modifiers

Restrict the updateVaultGroups function to authorized roles using access control modifiers such as onlyOwner or onlyAuthorized.

modifier onlyAuthorized() {
require(msg.sender == owner || authorizedRoles[msg.sender], "Not authorized");
_;
}
​
function updateVaultGroups() external onlyAuthorized {
// Function logic...
}

Explanation:
By introducing an onlyAuthorized modifier, only designated roles (e.g., the contract owner or specific authorized addresses) can invoke updateVaultGroups, preventing unauthorized access.

2. Utilize Role-Based Permissions

Leverage OpenZeppelin's AccessControl to define granular permissions, ensuring that only specific roles can execute sensitive functions.

bytes32 public constant UPDATER_ROLE = keccak256("UPDATER_ROLE");
​
function initialize(...) public initializer {
_setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
_setupRole(UPDATER_ROLE, msg.sender);
}
​
function updateVaultGroups() external onlyRole(UPDATER_ROLE) {
// Function logic...
}

Explanation:
Using AccessControl, roles like UPDATER_ROLE can be assigned to trusted addresses, ensuring that only these entities can call updateVaultGroups.

3. Incorporate Reentrancy Guards

Add reentrancy guards to prevent recursive calls that could lead to state inconsistencies or exploit vectors.

import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
​
contract FundFlowController is ReentrancyGuard, OwnableUpgradeable {
// ...
​
function updateVaultGroups() external onlyAuthorized nonReentrant {
// Function logic...
}
}

Explanation:
The nonReentrant modifier ensures that the function cannot be called recursively, protecting against potential reentrancy attacks.

Updates

Lead Judging Commences

inallhonesty Lead Judge 12 months ago
Submission Judgement Published
Invalidated
Reason: Non-acceptable severity

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