CVE-2021-42380: 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 clrvar function
Credit: reefs@jfrog.com reefs@jfrog.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Busybox Busybox | >=1.28.0<=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 |
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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://launchpad.net/bugs/cve/CVE-2021-42380
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6T2TURBYYJGBMQTTN2DSOAIQGP7WCPGV/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQXGOGWBIYWOIVXJVRKHZR34UMEHQBXS/
- https://security-tracker.debian.org/tracker/CVE-2021-42380
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42380
- https://nvd.nist.gov/vuln/detail/CVE-2021-42380
- https://ubuntu.com/security/CVE-2021-42380
Frequently Asked Questions
What is CVE-2021-42380?
CVE-2021-42380 is a use-after-free vulnerability in Busybox's awk applet that can lead to denial of service and potentially code execution.
Which software is affected by CVE-2021-42380?
Busybox versions 1.27.2-2ubuntu3.4, 1.30.1-4ubuntu6.4, 1.30.1-6ubuntu2.1, 1.30.1-6ubuntu3.1, 1.30.1-7ubuntu2, and 1.34.0 are affected.
How can CVE-2021-42380 be exploited?
An attacker can exploit CVE-2021-42380 by crafting a malicious awk pattern and passing it to the clrvar function of Busybox's awk applet, leading to the use-after-free vulnerability.
What is the severity of CVE-2021-42380?
The severity of CVE-2021-42380 is high, as it can result in denial of service and possible code execution.
How can I fix CVE-2021-42380?
To fix CVE-2021-42380, update Busybox to version 1.27.2-2ubuntu3.4, 1.30.1-4ubuntu6.4, 1.30.1-6ubuntu2.1, 1.30.1-6ubuntu3.1, 1.30.1-7ubuntu2, or 1.34.0 depending on the specific version in use.
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