7.2
CWE
416
Advisory Published
Updated

CVE-2021-42381: Use After Free

First published: Mon Nov 15 2021(Updated: )

A use-after-free in Busybox's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the hash_init function

Credit: reefs@jfrog.com reefs@jfrog.com reefs@jfrog.com

Affected SoftwareAffected VersionHow to fix
Busybox Busybox>=1.21.0<=1.33.1
Fedoraproject Fedora=33
Fedoraproject Fedora=34
debian/busybox<=1:1.30.1-6
1:1.35.0-4
1:1.36.1-9
>=1.21.0<=1.33.1
=33
=34

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Frequently Asked Questions

  • What is CVE-2021-42381?

    CVE-2021-42381 is a vulnerability in Busybox's awk applet that can lead to denial of service and code execution when processing a crafted awk pattern in the hash_init function.

  • Which software is affected by CVE-2021-42381?

    The following versions of Busybox are affected: 1:1.27.2-2ubuntu3.4, 1:1.30.1-4ubuntu6.4, 1:1.30.1-6ubuntu2.1, 1:1.30.1-6ubuntu3.1, 1:1.30.1-7ubuntu2, and 1.34.0.

  • How can CVE-2021-42381 be exploited?

    CVE-2021-42381 can be exploited by processing a crafted awk pattern in the hash_init function of Busybox's awk applet.

  • What is the severity of CVE-2021-42381?

    The severity of CVE-2021-42381 is not mentioned in the provided information.

  • How can I fix CVE-2021-42381?

    To fix CVE-2021-42381, update Busybox to a version that includes the necessary fixes, such as version 1.35.0-4 or higher.

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