Summary

The getUserMeowllateralInEuros function calculates the total collateral of a user across all vaults by iterating through the vaults array. If the array is too large, this can result in excessive gas consumption, leading to potential DoS attacks. Additionally, unchecked arithmetic can lead to overflow issues when summing large collateral values. Proper bounds checking and overflow protections are necessary to ensure the function's reliability and security.

Vulnerability Details

Issues Identified

1. Denial of Service (DoS) Attack:

   • Unbounded Loop: The function iterates over the entire vaults array, and if the array is very large, it can lead to high gas consumption and potential out-of-gas errors.

   • DoS by Large Arrays: An attacker can exploit this by adding a large number of vaults, causing the function to fail due to excessive gas usage.

2. Math Issues:

   • Unchecked Arithmetic: Although the loop uses unchecked { ++i; }, which prevents overflow, there is no explicit check for the accumulated value of totalUserMeowllateral, which could result in overflow for large values.

Impact

The lack of bounds on the vaults array can lead to DoS attacks, where the function becomes unusable due to high gas costs. Additionally, unchecked arithmetic can cause overflow, leading to incorrect calculations and potential vulnerabilities in the system.

Tools Used

Manual

Recommendations

To mitigate these issues, implement bounds checking on the vaults array size and add overflow checks when summing up collateral values.