medium
5.5
CWE
476
Advisory Published
Updated

CVE-2021-42376: Null Pointer Dereference

First published: Mon Nov 15 2021(Updated: )

A NULL pointer dereference in Busybox's hush applet leads to denial of service when processing a crafted shell command, due to missing validation after a \x03 delimiter character. This may be used for DoS under very rare conditions of filtered command input.

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

Affected SoftwareAffected VersionHow to fix
Ubuntu BusyBox Static>=1.16.0<1.34.0
Fedora=33
Fedora=34
netapp cloud backup
netapp hci management node
netapp solidfire
All of
netapp h300s firmware
netapp h300s
All of
NetApp H500S Firmware
netapp h500s
All of
netapp h700s firmware
netapp h700s
All of
netapp h300e firmware
netapp h300e
All of
netapp h500e firmware
netapp h500e
All of
netapp h700e firmware
netapp h700e
All of
netapp h410s firmware
netapp h410s
netapp h300s firmware
netapp h300s
NetApp H500S Firmware
netapp h500s
netapp h700s firmware
netapp h700s
netapp h300e firmware
netapp h300e
netapp h500e firmware
netapp h500e
netapp h700e firmware
netapp h700e
netapp h410s firmware
netapp h410s

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Reference Links

Frequently Asked Questions

  • What is CVE-2021-42376?

    CVE-2021-42376 is a vulnerability in Busybox's hush applet that can lead to denial of service when processing a crafted shell command.

  • What is the severity of CVE-2021-42376?

    The severity of CVE-2021-42376 is medium, with a severity value of 5.5.

  • Which software is affected by CVE-2021-42376?

    Busybox versions from 1.16.0 to 1.34.0, Fedora 33, Fedora 34, Netapp Cloud Backup, Netapp HCI Management Node, Netapp Solidfire.

  • How can CVE-2021-42376 be exploited?

    CVE-2021-42376 can be exploited by sending a crafted shell command that triggers a NULL pointer dereference in Busybox's hush applet.

  • Are there any references for CVE-2021-42376?

    Yes, here are some references for CVE-2021-42376: [link 1](https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog), [link 2](https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/), [link 3](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6T2TURBYYJGBMQTTN2DSOAIQGP7WCPGV/)

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