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CVE-2022-39384 OpenZeppelin Contracts initializer reentrancy may lead to double initialization

Medium 5.6 Published Updated

Attackers can reenter initializer functions in minimal proxies, potentially causing double initialization and state corruption in smart contracts.

Exploited in the wild
Not known
Login needed
Not needed
Attackable
Over the internet
Victim action needed
Not needed
Fix
Available

What is CVE-2022-39384?

CVE-2022-39384 is a medium-severity vulnerability in openzeppelin-contracts, published on 4 Nov 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

OpenZeppelin Contracts is a library for secure smart contract development. Before version 4.4.1 but after 3.2.0, initializer functions that are invoked separate from contract creation (the most prominent example being minimal proxies) may be reentered if they make an untrusted non-view external call. Once an initializer has finished running it can never be re-executed. However, an exception put in place to support multiple inheritance made reentrancy possible in the scenario described above, breaking the expectation that there is a single execution. Note that upgradeable proxies are commonly initialized together with contract creation, where reentrancy is not feasible, so the impact of this issue is believed to be minor. This issue has been patched, please upgrade to version 4.4.1. As a workaround, avoid untrusted external calls during initialization.

Weakness: CWE-665

Which versions are affected by CVE-2022-39384?

It affects 2 products.

Products include Openzeppelin Contracts, Openzeppelin Contracts Upgradeable.

How do I fix CVE-2022-39384?

Upgrade to a fixed version.

Is CVE-2022-39384 being exploited?

There is no known exploitation of CVE-2022-39384 in the wild and no public exploit code.

Sources

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