Submitted by 0xBinChook, also found by 0x3b, 0xRobocop, ether_sky, pina, Tripathi, 0xpiken, juancito, SpicyMeatball, erosjohn, fnanni, and cats
https://github.com/code-423n4/2024-01-salty/blob/53516c2cdfdfacb662cdea6417c52f23c94d5b5b/src/dao/Proposals.sol#L396-L397 
https://github.com/code-423n4/2024-01-salty/blob/53516c2cdfdfacb662cdea6417c52f23c94d5b5b/src/dao/DAO.sol#L281-L281
A staker is restricted to sponsoring a single proposal at any given time. This proposal remains active until a predetermined duration has elapsed, and it has received the sufficient number of votes to reach a quorum, after which it can be finalized.
However, if a staker sponsors a proposal that fails to attract the necessary quorum of votes, it remains indefinitely in an active state. This situation effectively locks the staker in a position where they cannot propose any new initiatives, as they are stuck with an unresolved proposal.
There is no mechanism for sponsors to withdraw or cancel their proposals. So when a proposal is unable to achieve quorum, the sponsor is left in a predicament where they are unable to further participate in the governance through the initiation of new proposals.
Furthermore, there is a noticeable lack of motivation for stakers to vote against proposals that are not on track to meet the quorum. As these proposals cannot pass without achieving the required quorum, resulting in a situation where voting against such proposals does not offer any tangible benefit.
Steps:
A staker can have only one active proposal
Within Proposals stakers are identified as users and when creating a proposal there is a check Proposals::_possiblyCreateProposal()
With the state being pushed later in Proposals::_possiblyCreateProposal()
A proposal can only be finalized after sufficient time has passed
The check to ensure the minimum time has passed in Proposals::canFinalizeBallot()
A proposal can only be finalized after quorum is reached
The check to ensure quorum is reached in Proposals::canFinalizeBallot()
Foundry
Allow the proposals to be closed (equivalent to finalized as NO or NO_CHANGE), which would allow the sponsor to afterward make a different proposal.
(This feature would also generally allow removing dead proposals)
Add a time field to Ballot in IProposals:
Populate the ballotCloseTime in Proposal::_possiblyCreateProposal, using a constant in this example, it could always another DAO configuration option:
Add a function to return whether a proposal can be closed to Proposal:
Add a function to close a ballot without any side effect to DAO
othernet-global (Salty.IO) confirmed and commented:
Status: Mitigated with an Error. Full details in report from 0xpiken, and also included in the Mitigation Review section below.
