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CVE-2023-49798 : Security Advisory and Response

Learn about CVE-2023-49798, a vulnerability in OpenZeppelin Contracts version 4.9.4 causing unintended duplicated operations during subcalls execution. Find out the impact, technical details, and mitigation steps.

This article provides detailed information about CVE-2023-49798, a vulnerability related to duplicated execution of subcalls in OpenZeppelin Contracts.

Understanding CVE-2023-49798

This CVE involves a merge issue in OpenZeppelin Contracts 4.9.4 leading to unintended duplicated operations during subcalls execution.

What is CVE-2023-49798?

The vulnerability in OpenZeppelin Contracts 4.9.4 causes all subcalls to be executed twice, potentially resulting in unintended duplicate operations like asset transfers.

The Impact of CVE-2023-49798

This vulnerability exposes users to duplication of operations, posing a risk to the integrity of asset transfers within smart contracts.

Technical Details of CVE-2023-49798

This section covers the specific technical details of the CVE.

Vulnerability Description

Due to a merge issue, the 4.9.4 version of OpenZeppelin Contracts executes all subcalls twice, resulting in unintended operations. This issue was resolved in version 4.9.5.

Affected Systems and Versions

The vulnerability affects OpenZeppelin Contracts version 4.9.4. Users utilizing this specific version are at risk of unintended duplicate operations.

Exploitation Mechanism

The vulnerability occurs due to a line duplication issue during the merge process, leading to the execution of all subcalls twice in OpenZeppelin Contracts 4.9.4.

Mitigation and Prevention

This section outlines the steps to mitigate and prevent exploitation of the CVE.

Immediate Steps to Take

Users are strongly advised to upgrade to a secure version of OpenZeppelin Contracts beyond 4.9.4 to avoid the risk of duplicated operations.

Long-Term Security Practices

Maintain a proactive approach to software development, including regular updates and code reviews to prevent similar vulnerabilities in the future.

Patching and Updates

OpenZeppelin released version 4.9.5 to address the duplicated execution issue. Users should promptly update to the latest secure version to mitigate the vulnerability.

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