Smart Account Module Explained in Detail
A smart account module adds behavior to a wallet or smart account. Modules can validate signatures, execute calls, enforce spending limits, recover accounts, install hooks, or support session keys.
Modules are useful, but they often sit near account-level privilege.
Smart contract example
install module -> module validates or executes account actions
The module's type and permissions define what it can do.
Smart Account Module in Auditing
A module can become a hidden owner. If it can execute arbitrary calls, validate any signature, or block removal, it can control the account.
Auditors map every installed module and its privilege level.
Red flags in code
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Anyone can install or enable a module.
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Validator, executor, hook, and fallback module types are confused.
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Module code is called with delegatecall without strict trust.
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Uninstall leaves stale permissions behind.
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A module can revert forever and brick account execution.
How to test or review it
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Test install and uninstall authorization.
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Verify each module can only perform its intended role.
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Try self-calls and batched calls that bypass stricter checks.
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Review hook ordering and reentrancy during module callbacks.
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Confirm removed modules lose all privileges.
Keep learning this topic
Account Abstraction
Account abstraction lets smart contract accounts define their own validation rules instead of relying only on externally owned account transaction rules.
Session Key
A session key is a limited key authorized by a wallet or smart account to perform constrained actions for a limited time or scope.
Delegatecall
Delegatecall executes code from another contract while reading and writing the caller's storage, preserving the original caller context.
Practice this in real audit scenarios
Definitions help, but auditors need reps. SCH turns concepts like Smart Account Module into exploit labs, code review habits, and report-writing practice.
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