Attacker can manipulate the rewards that are to be distributed as distributeAssets() function is external and callable by anyone.
As the distributeAssets() function can be called by anyone, attacker might define there own _collateralRate. Stakers gets the assets according to the collateral rate. This creates the problem.
As the collateral rate directly affects the asset to be receive by the stakers. Stakers might not get the assets they should get.
Manual Review
Use the Role-Based Access Control (RBAC) access control like in distributeFees function.
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