Authorized users can change beta value (https://github.com/code-423n4/2023-10-badger/blob/main/packages/contracts/contracts/CdpManager.sol#L830), if its set to zero.
Well divide by zero here:
https://github.com/code-423n4/2023-10-badger/blob/main/packages/contracts/contracts/CdpManager.sol#L624
