Missing Require Statement in setManager Function

[c4-bot-6]

Lines of code

https://github.com/code-423n4/2024-01-curves/blob/main/contracts/Security.sol#L23-L25

Vulnerability details

A security vulnerability has been identified in the setManager function of the Security contract, where a missing require statement allows the possibility of setting the manager address to zero. This could lead to unexpected behavior and potential security risks, enabling unauthorized access to manager privileges.

Impact

The missing require statement in the setManager function of the Security contract may lead to a scenario where an attacker could maliciously set the manager address to zero, potentially compromising the security of the system.

Example Attack Scenario:

Suppose the Security contract manages access control for critical functions in a decentralized finance (DeFi) protocol. The manager role grants privileged access to functions that control the flow of funds or sensitive operations.

Vulnerable Code (Before Fix):

function setManager(address manager_, bool value) public onlyOwner {
    // Missing require statement
    managers[manager_] = value;
}

An attacker exploits this vulnerability as follows:

The attacker identifies the target contract using the Security contract and observes that the manager role has significant privileges.

The attacker calls the setManager function with the manager address set to address(0), taking advantage of the missing require statement.

The manager address is set to zero without any validation, effectively compromising the security model.

The attacker, now having set the manager to address(0), gains unauthorized access to critical functions previously protected by the manager role.

Potential Consequences: Unauthorized access: The attacker may gain control over functions reserved for the manager, potentially allowing them to manipulate funds, alter system parameters, or perform other critical actions.

System instability: Unintended access to privileged functions may lead to unexpected behavior, impacting the stability and reliability of the entire DeFi protocol.

Financial loss: If the compromised functions involve fund management, the attacker could initiate malicious transactions, resulting in financial losses for users.

Proof of Concept

Deploy Security Contract and Set Manager Address to Zero:

Deploy a new instance of the Security contract. Call the setManager function with the manager address set to zero.

// Deploy Security contract
Security security = new Security();

// Attempt to set manager address to zero
security.setManager(address(0), true);
Verify Incorrect Manager Address Update:

Check the state of managers in the Security contract to confirm whether the manager address has been set to zero.

// Check if the manager address is set to zero
bool isManager = security.managers(address(0));
// isManager should be true, indicating that the manager address is set to zero without a require statement.

Tools Used

Recommended Mitigation Steps

Adding a require statement to ensure that the provided manager address is not zero in the setManager function mitigates this vulnerability:

function setManager(address manager_, bool value) public onlyOwner {
    require(manager_ != address(0), "Invalid manager address");
    managers[manager_] = value;
}

This modification prevents the attacker from setting the manager address to zero, enhancing the overall security of the system.

Assessed type

Access Control

[c4-pre-sort]

raymondfam marked the issue as insufficient quality report

[c4-pre-sort]

raymondfam marked the issue as duplicate of #3

[c4-judge]

alcueca marked the issue as unsatisfactory: Invalid