CVE-2021-42383: 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 evaluate function
Credit: reefs@jfrog.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Busybox Busybox | =1.33.1 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 |
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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/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQXGOGWBIYWOIVXJVRKHZR34UMEHQBXS/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6T2TURBYYJGBMQTTN2DSOAIQGP7WCPGV/
Frequently Asked Questions
What is CVE-2021-42383?
CVE-2021-42383 is a use-after-free vulnerability in Busybox's awk applet that can lead to denial of service and possibly code execution when processing a crafted awk pattern in the evaluate function.
How does CVE-2021-42383 impact the affected software?
CVE-2021-42383 can result in denial of service and possibly code execution on affected software that includes Busybox version 1.33.1, Fedora 33, and Fedora 34.
What is the severity of CVE-2021-42383?
CVE-2021-42383 has a severity rating of high (7.2).
How can I fix CVE-2021-42383?
To fix CVE-2021-42383, users should update to a patched version of the affected software when it becomes available.
Where can I find more information about CVE-2021-42383?
You can find more information about CVE-2021-42383 at the following references: [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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- collector/mitre-cve
- source/MITRE
- vendor/busybox
- canonical/busybox busybox
- version/busybox busybox/1.33.1
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/33
- version/fedoraproject fedora/34