CVE-2021-43790 : What You Need to Know

Lucet, a native WebAssembly compiler and runtime, is affected by a use-after-free vulnerability in the

lucet-runtime

main branch up to version 0.6.1.

Understanding CVE-2021-43790

Lucet is susceptible to a critical use-after-free flaw that can lead to severe consequences such as memory corruption or data race.

What is CVE-2021-43790?

Lucet, developed by Bytecode Alliance, is a WebAssembly compiler and runtime tool
Vulnerability: Use-after-free in the

lucet-runtime

main branch up to version 0.6.1

The Impact of CVE-2021-43790

The vulnerability can result in memory corruption, data race, or other related issues due to a use-after-free flaw in Lucet's Instance object.

Technical Details of CVE-2021-43790

The following details elaborate on the technical aspects of the CVE.

Vulnerability Description

Bug in the main branch of

lucet-runtime

causing use-after-free in Instance objects

Affected Systems and Versions

Product: Lucet
Vendor: Bytecode Alliance
Versions affected: <= 0.6.1

Exploitation Mechanism

Successful exploitation could lead to memory corruption or data race

Mitigation and Prevention

Actions to mitigate and prevent the CVE are crucial.

Immediate Steps to Take

Upgrade to the main branch of the Lucet repository

Long-Term Security Practices

Regularly update software components
Utilize secure coding practices
Conduct security audits and code reviews

Patching and Updates

Lucet no longer provides versioned releases; users should upgrade to the main branch for the fix