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
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Busybox Busybox | >=1.16.0<1.34.0 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 | |
| Netapp Cloud Backup | ||
| Netapp Hci Management Node | ||
| Netapp Solidfire | ||
| 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
- https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog
- https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6T2TURBYYJGBMQTTN2DSOAIQGP7WCPGV/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UQXGOGWBIYWOIVXJVRKHZR34UMEHQBXS/
- https://security.netapp.com/advisory/ntap-20211223-0002/
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/)
- agent/references
- agent/weakness
- agent/severity
- agent/author
- agent/type
- agent/description
- agent/event
- agent/last-modified-date
- agent/first-publish-date
- agent/softwarecombine
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/busybox
- canonical/busybox busybox
- version/busybox busybox/1.16.0
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/33
- version/fedoraproject fedora/34
- vendor/netapp
- canonical/netapp cloud backup
- canonical/netapp hci management node
- canonical/netapp solidfire
- canonical/netapp h300s firmware
- canonical/netapp h300s
- canonical/netapp h500s firmware
- canonical/netapp h500s
- canonical/netapp h700s firmware
- canonical/netapp h700s
- canonical/netapp h300e firmware
- canonical/netapp h300e
- canonical/netapp h500e firmware
- canonical/netapp h500e
- canonical/netapp h700e firmware
- canonical/netapp h700e
- canonical/netapp h410s firmware
- canonical/netapp h410s