Unprotected Selfdestruct
In contracts that have a selfdestruct method, if there are missing or insufficient access controls, malicious actors can self-destruct the contract. It's important to consider whether self-destruct functionality is absolutely necessary. If it is necessary, consider using a multisig authorization to prevent an attack.
This attack was used in the Parity Attack. An anonymous user located, and exploited a vulnerability in the "library" smart contract, making themself the contract owner. The attacker then proceeded to self-destruct the contract. This led to funds being blocked in 587 unique wallets, holding a total of 513,774.16 Ether.
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