Project

Summary:

The joinDAO function lacks checks to determine whether the DAO type is Private or Sponsored. Specifically, the function should enforce additional rules based on the DAO's type, but these conditions are not currently implemented. For Private DAOs, the logic should be modified to only allow users to join the last tier, and for Sponsored DAOs, there may be additional rules regarding tier availability or access restrictions. The absence of this logic introduces the risk of users accessing tiers that they should not be able to join based on the DAO's type.

Vulnerability Details:

The function does not differentiate between Private and Sponsored DAOs.

• Private DAOs should restrict membership to only the last tier, but this check is missing.

• Sponsored DAOs might have additional rules, such as only allowing specific tiers to be accessible, but these checks are also absent.

Impact:

The missing logic allows potential exploits in the following ways:

1. Private DAO Exploit:
   A user could join any tier in a Private DAO, whereas they should only be able to join the last tier. This could grant users unintended access to the DAO, potentially undermining the privacy or exclusivity of the DAO's structure.

2. Sponsored DAO Exploit:
   Sponsored DAOs might have restrictions on tier access, such as requiring certain conditions to access specific tiers. Without these checks, users could access restricted tiers or bypass rules set by the sponsor.

3. DAO Integrity and Security:
   Bypassing these access checks could lead to the violation of the DAO’s governance model, unfairly impacting members who should have tier access restrictions applied to them.

Tools Used:

Manual Code Review: Analysis of the joinDAO function and comparison against common patterns for handling access control in DAO memberships.

Recommendations:

Add logic for Private and Sponsored DAO tier